Model 870A User Manual

Warranty and Copyright

Warranty. All Berkeley Nucleonics (BNC) instruments are warranted against defects in material and workmanship for a period of two years from the date of shipment. Berkeley Nucleonics will, at its option, repair or replace products that prove to be defective during the warranty period, provided they are returned to Berkeley Nucleonics and provided the preventative maintenance procedures are followed. Repairs necessitated by misuse of the product are not covered by this warranty. No other warranties are expressed or implied, including but not limited to implied warranties of merchantability and fitness for a particular purpose. Berkeley Nucleonics is not liable for consequential damages. The warranty on the internal rechargeable batteries (option B3) is one year from the date of shipment. Battery replacement is available through Berkeley Nucleonics and its distributors.

Copyright. This manual is copyright by Berkeley Nucleonics and all rights are reserved. No portion of this document may be reproduced, copied, transmitted, transcribed, stored in a retrieval system, or translated in any form or by any means such as electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without written permission of Berkeley Nucleonics.

1. General Remarks

The devices described in this manual are signal generators that produce electromagnetic signals from 9 kHz up to 40 GHz with a power from -90 dBm up to +25 dBm. The exact range depends on the chosen device model and options. The devices can produce different types of modulations, such as AM, FM, PM, Pulse or Chirp.

They can be used in a variety of applications such as research and development or manufacturing and testing of electronic components.

Options, such as a 1U Case, an internal rechargeable battery, a GPIB interface or different types of power range extensions can be added.

1.1 Validity of this Manual

This manual is valid for the following devices and their extended versions:

• 835-4/6
• 845-12/20/26
• 865B-6/12/20/26/40
• 871
• 825-M, 845-M, 865B-M
• 845-M-X, 865B-M-X
• 855B-6-X, 12-X, 20-X, 33-X, 40-X
• 805-M
• 870A-12/20/40/50

2. Available Casing

The devices are available in the following cases.

2.1 Compact Portable Case (CPC)

Figure 1: 845-26, 865B-40, and 870A in a Compact Portable Case (with LCD and touch display, respectively).

2.2 1U Case

2.3 Desktop Chassis

2.4 Module

3. Connections and Transportation

3.1 Data Connections

The devices may only be connected to a network or a computer by using a shielded LAN cable. Unless shorter lengths are prescribed, a maximum length of 3 m must not be exceeded for the LAN and the USB connection.

3.2 Signal Connections

In general, all connections between the signal generator and another device should be made as short as possible and must be well shielded. It is recommended to use a high-quality cable with low loss especially for frequencies above 20 GHz.

3.3 Transportation

The devices must only be transported with the packaging supplied by the manufacturer. The device can be lifted up or transported in any orientation.

4. Safety Information

The following pieces of information are important to prevent personal injury, loss of life or damage to the equipment. Please read them carefully. If the device is used in a manner not specified by this manual, the protection provided by the device may be impaired.

4.1 Signal Symbol

In this manual, the following symbols are used to warn the reader about risks and dangers.

4.2 Labels on Products

The following labels are on the products. Familiarize yourself with the meaning of each of the labels before using the product.

Symbol	Meaning
	Direct Current (DC)
	Alternating Current (AC)
	Earth (Ground)
	EU label for separate collection of electrical and electronic waste.
	Caution, general danger zone. Attend the manual and/or a notice on the device.

4.3 General Safety Considerations

FCC notice

This equipment has been tested and found to comply with the limits for a Class A device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.

Operation of this equipment in a residential area may cause harmful interference in which case the user will be required to correct the interference at his or her expense.

CE notice. The instrument meets the EMC directive and the Low Voltage Directive described in the CE declaration in Appendix A. The instrument is CE marked.

5. Technical Specifications

Model-specific frequency, output power and phase-noise figures are given on the Model 870A datasheet and take precedence over any family-generic values shown here. The mechanical, connector, environmental and power figures below apply to the shared 800-series enclosures; the Model 870A uses the single-channel desktop enclosure and the 19” 2U rack-mount module described on its datasheet.

Model 870A Key Specifications

The following values are reproduced verbatim from the Model 870A datasheet (v1.04.5, dc-32605202). For the full specification set, see the Model 870A datasheet.

5.1 Dimensions

5.1.1 CPC

Dimensions of the compact portable case:

5.1.2 1U

Dimensions of the 1U:

5.2 Connectors

5.2.1 CPC

The front panel contains a status display (only in CPC), RF output female N-type connector (835), a female SMA connector (845, 865B-6,12,20,26,40, 855B, 845-M, 865B-M), or a K connector (865B-40) and an RF on/off key.

Front panel (Model 845-26)

1. Main LCD display. The main display shows the following information:
   • 1st line: RF frequency in Hz
   • 2nd line: RF amplitude in dBm
   • 3rd line: Frequency reference status (internal, external, lock status)
   • 4th line: Remote control status
2. Rotary Button. The rotary button is used to change the value selected on the screen.
3. RF 50 Ω connector. This female N-type connector respectively SMA connector provides the output for generator signals. The impedance is 50 ohm. The reverse power damage level is +30 dBm maximum. The maximum allowed DC level is +/- 30 dBm maximum.
4. Menu Buttons. The menu buttons are used to change the selected menu point or value.
5. Main Menu Button. The main menu button is used to enter the menu.
6. RF On/Off button. The ON/OFF key toggles between RF output on and RF output off. The green light is indicating whether the RF output is enabled or not.
7. Remote LED. The remote LED is indicating whether the device connected to a Computer or not.
8. Power LED. The power LED is indicating whether the device is connected to a Computer or not.

Rear panel (Model 845-26)

1. ΦM. This BNC female connector is the input for FM and PM.
2. REF IN. This BNC female connector is the input for the reference signal.
3. TRIG IN. This BNC female connector is the trigger input.
4. USB B. The USB B connector is used to connect the device to a computer.
5. LAN. The LAN connector is used to connect the device to a network.
6. Battery LED. In case the device has a rechargeable battery, this LED indicates whether the battery is charged or not.
7. Fan Holes. The holes by which the air is intaken.
8. Power Supply. Apply the BNC power adaptor to this connector to supply the device with energy.
9. On/Off Switch. Turns the device on or off.
10. Ground Screw.
11. FUNC OUT. This BNC female connector is the output for the function signal.
12. REF OUT. This BNC female connector is the output for the reference signal.
13. AM PULSE. This BNC female connector is the input for the AM and the PULSE Modulation signal.
14. Fan Holes. The holes by which the air is extruded.

5.2.2 1U: 845

Front panel

1. ON/OFF Switch. Turns the device on or off.
2. Power LED. The power LED is indicating whether the device is on or off.
3. Remote LED. The remote LED is indicating whether the device connected to a Computer or not.
4. Fan Holes. The holes by which the air is intaken.
5. RF 50 Ω connector. This female SMA connector respectively the female N-type connector provides the output for generator signals. The impedance is 50 ohm. The reverse power damage level is +30 dBm maximum. The maximum allowed DC level is +/- 10 V. Please check the data sheets for more details.

Rear panel

1. Ground Screw.
2. GPIB Connector. In case the device has the option "GPIB", on this position the GPIB connector is.
3. USB B. The USB B connector is used to connect the device to a computer.
4. LAN. The LAN connector is used to connect the device to a network.
5. Fuse Holder. This holder contains an exchangeable fuse.
6. Power Supply. Apply the BNC power adaptor to this position, the AC connector, to supply the device with energy.
7. REF IN. This BNC female connector is the input for the reference signal.
8. REF OUT. This BNC female connector is the output for the reference signal.
9. TRIG IN. This BNC female connector is the trigger input.
10. ΦM. This BNC female connector is the input for FM and PM.
11. PULSE. This BNC female connector is the input for the pulse signal.
12. FUNC OUT. This BNC female connector is the output for the function signal.
13. AM PULSE. This BNC female connector is the input for the AM and the PULSE Modulation signal.

5.2.3 1U: 855B / 865B-M-40-X

Front panel

1. ON/OFF Switch. Turns the device on or off.
2. Power LED. The power LED is indicating whether the device is on or off.
3. Remote LED. The remote LED is indicating whether the device connected to a Computer or not.
4. Channel 1: PULSE. This BNC female connector is the input for the PULSE Modulation signal.
5. Channel 1: RF OUT. This female SMA connector provides the output for the PULSE Modulation signal.
6. Channel 2
7. Channel 3
8. Channel 4
9. RF 50 Ω connector. This female K-type connector provides the output for the RF signals. The impedance is 50 ohm. The reverse power damage level is +30 dBm maximum. The maximum allowed DC level is +/- 10 V. Please check the data sheets for more details.

Rear panel

1. Ground Screw.
2. Sync In port. Unit-to-unit synchronization signal input. SMA female.
3. Sync Out port. Unit-to-unit synchronization signal output. SMA female.
4. CLK IN. External 3GHz reference input. SMA female.
5. CLK OUT. Internal 3GHz reference output. SMA female.
6. TRIG OUT. This BNC female connector is the trigger output.
7. TRIG IN. This BNC female connector is the trigger input.
8. REF OUT. This BNC female connector is the output for the reference signal.
9. REF IN. This BNC female connector is the input for the reference signal.
10. GPIB Connector. In case the device has the option "GPIB", on this position the GPIB connector is.
11. LAN. The LAN connector is used to connect the device to a network.
12. USB B. The USB B connector is used to connect the device to a computer.
13. Fuse Holder. This holder contains an exchangeable fuse.
14. Power Supply. Apply the BNC power adaptor to this connector to supply the device with energy.

5.2.4 CPC with Touch display

The front panel contains a touch display. RF output female SMA connector (845, 865B-6/12/20/26, 855B, 845-M, 865B-M) or a K connector (865B-40) and any kind of error and other messages. Information includes status indicators, frequency and amplitude settings, current connectivity status, and error messages.

Front panel

1. Main touch display. The main display shows information on the current function, such as frequency, power, reference.
2. Rotary Button. The rotary button is used to change the value selected on the screen.
3. RF 50 Ω connector. This female SMA respectively K connector provides the output for generator signals. The impedance is 50 ohm. The reverse power damage level is +30 dBm maximum. The maximum allowed DC level is +/- 10 V. Please check the data sheets for more details.

Rear panel

1. REF IN. This BNC female connector is the input for the reference signal.
2. MOD IN. This BNC female connector is the input for the modulation signal.
3. TRIG IN. This BNC female connector is the trigger input.
4. USB B. The USB B connector is used to connect the device to a computer.
5. LAN. The LAN connector is used to connect the device to a network.
6. Fan Holes. The holes by which the air is intake.
7. Power Supply. Apply the BNC power adaptor to this connector to supply the device with energy.
8. ON/Off Switch. Turns the device on or off.
9. Ground Screw.
10. TRIG OUT. This BNC female connector is a multi-function output.

5.3 Minimum Distances

The minimum distances are:

5.4 Energizing and de-Energizing

To energize the device, apply the following voltage to the following connector.

The 1U case has a fuse, accessible from the outside. To change the fuse, pull out the mains plug, push the fuse holder into the back panel and turn it around 45 degrees, then take the holder out. Replace the old fuse with a new one. It is forbidden to repair defect fuses or to bridge them by any means. Use only a fuse with the following specifications.

Type of fuse:

• Size. 5 x 20 mm
• Voltage. 250 V
• Current rating. 3.15 A
• Characteristic. Time-Lag T
• Breaking capacity. 35 A to 200 A

5.5 Proper operation conditions

The devices are designed for use in dry and clean environments. The CPC can also be used in field as long as the operating conditions are met. Operation in an environment with high dust content, high humidity, danger of explosion or chemical vapors is prohibited.

• Operating temperature range. 0°C to +45°C.
• Storage and transportation temperature range. -40°C to +70°C.
• Operating and storage altitude. 4600 m. In case of condensation 2 hours are to be allowed for drying prior operation. Operation is only allowed from a 3-terminal mains connector with a safety ground connection and a mains plug used in your specific country. For sufficient ventilation, ensure open ventilation holes.

5.6 Environmental Information

1. Waste electrical and electronic equipment must not be disposed of with unsorted municipal waste, but must be collected separately. Contact the BNC customer service center for environmentally responsible disposal of the product.
2. Specially marked equipment has a battery or accumulator that must not be disposed of with unsorted municipal waste, but must be collected separately. It may only be disposed of at a suitable collection point or via BNC service center.

6. Introduction

This instruction manual is valid for BNC model series 835, 845, 865B, 855B 845-M, and 865B-M. Chapter 4 gives guidance for a quick and easy setup of your new instrument. Chapter 5 describes the remote operation via BNC graphical user interface (GUI). Chapter 6 describes control via front panel and applies only to 835/845 models.

6.1 Included Material

Your signal generator kit contains the following items:

• Signal Generator
• Universal power adaptor (AC 100 to 240V) with corresponding country specific plugs
• Ethernet Cable
• Manuals and software CD

6.2 General Features and Functions (Model overview)

BNC RF and Microwave Signal Generator model overview.

General features include:

• Extendable power range (option PE3, PE4)
• Modulation capabilities for AM, FM, PM and PULM modulation (model dependent)
• Fast frequency, power and list sweeps
• Light weight, optional internal rechargeable batteries (options B3, EBAT)
• 3-inch status LCD (835/845 models only)
• Long-term support. Software upgrades (firmware, API, GUI) are available to download from www.berkeleynucleonics.com. You can also call our technical specialists for support. You can continue to use both of these services free of charge for the lifetime of the product.
• Universal LAN VXI-11 and USB 2.0 device and host interface
• 18-24 months calibration cycle

6.3 Options

• B3. Internal rechargeable battery
• FS. Fast switching
• LN. Enhanced close in phase noise
• MOD. Analogue modulation
• PE3. Mechanical step attenuator for extended power range

• PE4. Electrical step attenuator for extended power range

• GPIB. GPIB interface added
• AVIO. Specific avionics modulation capabilities added (Model 835)
• 1U. 19'' 1HE enclosure. No display, remote control only
• RM. 19'' 3HU rack-mount kit
• REAR. Move output to the rear
• 9K. Frequency range extension to 9 kHz
• HP. High output power
• TP. Color touch-screen front panel
• LH. Desktop housing with color touch-screen front panel
• NM. Remove modulation function
• EB. External power bank
• PHS. Phase coherent switching
• VREF. Variable external reference

7. Getting Started

7.1 System Requirements

7.2 Unpacking the Instrument

Remove the instrument materials from the shipping containers. Save the containers for future use.

For a list of material included in the standard package, please refer to chapter 4.1.

7.3 Initial Inspection

Inspect the shipping container for damage. If container is damaged, retain it until contents of the shipment have been verified against the packing list and instruments have been inspected for mechanical and electrical operation.

7.4 Starting the Instrument

This section describes installation instructions and verification tests.

7.4.1 Applying Power

Press the line on/off switch on the rear panel. If available, the front panel display will illuminate. The instrument will initialize and momentarily display the model number, firmware revision and product serial number. The display will then switch to the factory default display setting, showing preset frequency (100 MHz) and power (0 dBm), phase lock status (of internal reference) and instrument connectivity status. (Ethernet IP or USB Identifier).

Note, the instrument booting process may take up to 60 seconds (depending on configuration) to complete.

7.4.2 Connecting to LAN

Connect the instrument to your local area network (LAN) using the Ethernet cable. By default, the instrument is configured to accept its dynamic IP number from the DHCP server of your network. If it is configured properly, your network router will assign a dynamic IP number to the connection to your network so that the instrument can be automatically detected and connected to the network. Your instrument is now ready to receive remote commands.

7.4.3 Direct connectivity to host via Ethernet cable (no router)

You can connect to the instrument to your computer with the Ethernet cable without using a local area network with DHCP server. To work properly, the network controller (NIC) of your computer must be set to a static IP address in the ZEROCONF standard, beginning with 169.254.xxx.xxx (excluding 169.254.255.255) and ending with 169.254.255.254. Use the network mask 255.255.0.0. Some operating systems will not start a NIC unless connected to a network with a DHCP server, even if a fixed IP address is assigned. In that case, connect via the local area network instead.

7.4.4 Connecting through USB

Connect the instrument to the computer using a quality USB type-A to type-B cable. If properly connected, the operating system should automatically install a USBTMC device.

Note that if you want to use the USB BNC, it must be installed (or comparable) must be installed.

Use VISA Write to send the *IDN? Query and use VISA Read to get the response. The USBTMC protocol supports service request, triggers and other USB-specific operations.

7.4.5 Connecting through GPIB

Connect the instrument to the GPIB controller using the rear panel GPIB connector (option GPIB is required). Once connected properly, use VISA Write to send the *IDN? Query and use VISA Read to get the response. The protocol supports service request, triggers and other GPIB-specific operations.

7.4.6 Installing the 835/845 Remote Client

BNC's graphical user interface provides an intuitive control of the instruments. It runs under Windows operating system with minimum requirements. The DLL is embedded in the GUI application and requires the Microsoft .NET framework. The setup program guides you in a few steps through the installation process. In case the NET framework is not installed on your computer, then you need to install it manually. After installation the program will start.

7.4.7 Troubleshooting the LAN Interconnection

Software does not install properly

• Make sure your installation CD is not damaged.
• When Microsoft .NET Framework is not installed make sure that your computer is connected to the internet during installation of the BNC Software. If no internet connection is available, install the .NET Framework that is available on the installation CD.

Software cannot detect any instrument

• Make sure you have connected both computer and instrument to a common network.
• If a direct connection is used you may require to reset your computer Ethernet controller (depending on the configuration). Note that in that case detection of the instrument can take a considerable amount of time if your computer is configured to work with an external DHCP server. In some cases the detection may even fail completely. Configure your computer network controller to an appropriate fixed IP instead.
• Make sure that your software firewall enables the GUI to setup a TCP/IP connection via the LAN. Under Windows 7/10 you can do that like this: Open Control Panel under Settings in your Start menu. Then go to Windows Firewall. Click on Exceptions and then add Program. If the GUI is in this list, choose it and click OK otherwise you have to browse for the path to GUI installation directory. Finally close all open dialogs with OK. Now your Windows Firewall will not block requests from the GUI.

7.4.8 Shutting Down the Signal Generator

Press the line on/off switch on the rear panel to off.

8. Using the Graphical User Interface (GUI)

BNC's graphical user interface provides an intuitive control of the signal generator. It runs under any Windows operating system. Make sure the software is installed correctly and the computer's firewall is configured properly. The GUI's dynamic link library (DLL) uses the Microsoft .NET framework.

8.1 Start the Signal Generator (SG) GUI

After successful installation of the software double-click the software shortcut that has been created on your desktop.

After start, the GUI will automatically detect existing BNC instruments that are connected to the computer (network) via local area network, USB, or GPIB. In the CONTROL tab (see Figure 6-a) the detected instruments are listed. Clicking on one of the devices will instantly establish connection. Clicking on an alternate device will disconnect the old device and reconnect to the new device. Scan Instruments button will enable automated scanning for new instruments. Disconnect/Connect button will establish and terminate connection.

8.2 General Look

1. The CONTROL tab (Figure 6-a) completes the following function:
   • Scan and establish connection to instrument
   • Configure remote interface (LAN, USB, GPIB)
   • Save, load and manage instrument memory states
2. CW tab
3. SWEEP tab
4. MODULATION Tab
5. REFERENCE Tab
6. TRIGGER Tab
7. LF OUT Tab

8.3 Simultaneously controlling Multiple Signal Generators from one PC

You can easily control multiple BNC instruments from a single computer but you need to start a separate GUI for every instrument as only one instrument is controlled by the GUI at once.

8.4 Store and Load Instrument States

Multiple memory states are available to store instrument settings. By clicking on the Device Settings Memory button the currently saved memory settings are displayed and can be retrieved or shown on a separate dialog 6. To modify or enter a state, click on the appropriate line and select if the current instrument settings should be stored or loaded into the selected memory state.

The memory states can also be accessed via the front panel menu.

8.5 Setting Network Configuration

The Network Configuration button allows configuring the LAN settings as shown in Figure 6-c. You may choose from three different network addressing modes: setting to Auto will check for a DHCP server on the network but if this fails, will fall back to assigning an address automatically using zeroconf. Setting to DHCP will check for a DHCP server on the network (without a fallback) and Manual will require to supply all network settings for the device manually below. Additionally, the device name and revision are displayed at the bottom of the dialog box.

8.6 Multi-Session Option

The "Multi-Session" checkbox can be selected to enable the device to be accessed from more than one instance of the UI. This enables users on multiple computers on the network to connect to and configure the device simultaneously. It is the user's responsibility to manage access conflicts whilst this mode is enabled (i.e. 2 users changing the same option from different PCs).

8.7 Device Port Setting

The "Port" option allows the listening TCP port to be customized for the device. The default setting for all devices is port 18. If changed, the device will no longer be accessible using this port number. Any instances of the UI (or other VISA applications connecting to the device over a network) will need to modify their destination port number to match the device to connect to.

8.8 Connecting to devices using a non-default port

There are 2 options for connecting to a device when its default listening port has been changed.

1. Specify a temporary connection port. Click the menu Info → Connection Settings → Specify Connection Port. This will cause a new setting "Custom Port" to be displayed on the "Control" tab of the UI (see Figures 6-d and 6-e). The connection port to use can then be entered (within the range of permissible TCP port numbers). Beware that this setting will overwrite the default port until it is removed. To remove, click the menu Connection Port setting from the UI and reset the value using the current default port. Deleting the port number from the "Custom Port" text box will also cause the UI to revert to using the default port.
2. Change the application's default port setting. The global default port to use for connections can be changed by selecting menu Info → Connection Settings → Change Default Port (see figure 6-d). A default port can be entered into the dialog box which appears and set by clicking button "Set Default" only permissible TCP ports can be entered here. If the new default port is entered, then the new default port setting. Deleting the port number from the default setting will use the current default port as before, including after restarting the UI or rebooting your system.

8.9 Setting the GPIB Address

If the instrument has the GPIB option installed, the GPIB address can be changed in the GPIB submenu in the control tab. Valid GPIB addresses range from 1 to 30. To verify GPIB functionality, use the VISA Assistant available with the Agilent IO Library or the Getting Started Wizard available with the National Instrument IO Library. These utility programs enable you to communicate with the signal generator and verify operation. For information and instructions on running these programs refer to the Help menu available in each utility.

8.10 Perform Firmware Upgrade

A firmware upgrade of the instrument can be done directly via the GUI. First make sure you are connected to the right instrument and have the correct firmware files (.tar) ready. Then apply Controller → Update Firmware and select the appropriate binary file that you have received from BNC or downloaded from the BNC website. The update will take a few seconds and after completion your instrument will reboot. Reconnect to the instruments after booting is completed and continue with the updated firmware.

8.11 Multi-Output GUI Control

Individual outputs of the BNC multi-channel signal sources (such as 855B or 865B-M-40-X) can be controlled by the GUI by selecting the corresponding channel above the control tab menu. Each channel can be configured fully independently as if they were individual signal generators. Note that the "Select Channel" appears only when connected to a multi-channel device.

9. Local Operation via Front Panel

Most of the signal generator models offer direct front panel control. A rotary knob and five keys (MENU), and four arrow keys allow full control over the instrument. Figure 7-a shows the front panel of the 835/845, Figure 7-b shows the front panel of the 865B (resp. 835/845 with option TP).

For both Front panels:

• RF 50 Ω connector. This female N-type connector provides the output for RF signals. The impedance is 50 ohm. The damage level is +30 dBm. The maximum allowed power level is +/- 10 V.

Only for 835/845 front panels:

• RF On/Off button. The ON/OFF key toggles between RF output on and RF output off. The green light is indicating whether the RF output is on or off.
• Menu Key. This is a multifunction key. The key is used to enter and exit menus. Press once to return to the CW menu, multiple times to toggle between the selected submenu and the CW menu.

You can always be exit by pressing the menu key.

The four arrow keys are used to move cursor within the screen menus. Within menus, the up/down keys are used to enter (1) and exit (2) menu items or, when editing, increment or decrement a value. The left/right keys are used in next parameter hierarchy (3) in next menu hierarchy (4). The arrow keys are used to navigate between menu pages where pages exist and to navigate through the lists.

The LAN LED illuminates when a remote connection is made.

Power LED illuminates when system is powered up.

The currently active display position is shown by the cursor (underline symbol, or different background colour). The cursor does not move beyond the field of the currently selected parameter. Rotate the front panel knob to modify the value. Clockwise rotation increases the value while counter-clockwise rotation decreases the parameter. The maximum or minimum limit of the parameter.

9.1 Displayed Parameter Formats

The following sections describe how to control the instrument via the front panel control by invoking various menu functions.

9.2 CW Display

The Main or CW Display is shown after the instrument has successfully booted and is ready. The four line display has the following format:

9.3 Main Menu Display

The Main Menu Display is invoked by pressing the menu key. The main menu contains nine submenus as shown below.

1. Sweep
2. Modulation
3. Reference
4. Trigger
5. LF Output
6. LAN Config
7. Display Settings
8. Device Settings
9. Help

9.4 Frequency Sweep Submenu

After accessing the Frequency Sweep menu, first of three displays allows to enter the start and stop frequency. On the second display the number of points and the on and off time can be entered. On the third screen select the sweep mode between Linear, LOGarithmic and RANDom. Also select the repetition mode between INFinite and 1 (single repetition).

Start the sweep by pressing the RF On/Off button.

9.5 Power Sweep Submenu

After accessing the Power Sweep menu, the first display allows to enter start and stop power. On the second display, the number of points and the on and off time can be entered. On the third display, select the repetition mode between INFinite, and 1 (single repetition).

Start the sweep by pressing the RF On/Off button.

Figure 7-p: Displays shown for the frequency sweep configuration.

9.6 List Sweep Submenu

When entering the List Sweep submenu, a list of stored list sweeps is displayed.

9.7 Modulation Submenu

On line 1 select between INT (internal pulse generator) and EXT (external input). If internal modulation (INT) is selected, go to line 2 to change pulse width to desired value and go to line 3 to change pulse modulation frequency.

9.7.1 Pulse Modulation Submenu

On line 1 select between INT (internal pulse generator) and EXT (external input). If internal modulation (INT) is selected, go to line 2 to change pulse width to desired value and go to line 3 to change pulse modulation frequency.

9.7.2 Amplitude Modulation Submenu

In the Amplitude Mod submenu the internal amplitude modulation can be accessed. The modulation rate can be set between 1 Hz and 10 kHz.

9.7.3 Frequency Modulation Submenu

In the Frequency Mod submenu the internal and external frequency modulation can be accessed. It is possible to change between internal and external modulation source and to change modulation parameters such as modulation rate, depth or sensitivity.

9.7.4 Phase Modulation Submenu

In the phase modulation submenu the internal and external phase modulation can be accessed. It is possible to change between internal and external modulation source and change modulation parameters.

9.8 Reference Submenu

After accessing the Reference menu, use the rotary knob to toggle between ON and OFF or to change reference frequency to the desired value, respectively.

9.9 Trigger Submenu

After accessing the Trigger menu, use the rotary knob to toggle the selected entry value or to change selected digit. The display shows up to six selected entries.

• Select SOURce. IMMediate, EXTernal, BUS (SCPI command), KEY (RF on/off button)
• Select SLOPe. POSitive, NEGative
• Select CONTinuous. ON, OFF (ON means that the trigger is re-armed after each trigger occurrence)
• Select RETRigger. OFF, ON, IMMediate (OFF means that any trigger event during execution of list is ignored)

Enter DELAY: trigger delay in micro seconds.

Press the RF On/Off button to arm the trigger. Exit the menu by pressing the menu key.

9.10 LF OUTPUT Submenu

In the LF OUTPUT Submenu the FUNCT OUT output can be configured at the rear panel of the instrument. On the first screen source for the FUNCT OUT can be selected. Choose LFG for the low frequency generator, TRIG to enable the instrument trigger output and PULSE to enable the pulse modulation in DC level is +/- 10 V. The source for the device frequency and voltage amplitude.

9.11 LAN Configuration Submenu

In the LAN Configuration menu, IP address, subnet mask and DHCP can be configured. Press the RF key to save the configuration (don't if you want to discard your changes).

9.12 Display Settings Submenu

After accessing the Display Configuration menu, use the rotary knob to change the display contrast as required. Press the menu key to save and exit the Display Settings submenu.

9.12.1 Save Settings Submenu

After accessing the Load Settings menu, use the rotary knob to get to the memory state you want to save. Press RF ON/OFF key to save your settings.

9.12.2 Load Settings Submenu

After accessing the Load Settings menu, use the rotary knob to get to the memory state you want to load. Press RF ON/OFF key to load.

9.12.3 Load Defaults Submenu

Press RF ON/OFF key button to load.

9.13 Help Submenu

This submenu provides basic information about the front panel menu control.

10. Combined Modulation

The tables below show what modulation types and sweeps can be active simultaneously.

Some modulations can be combined with frequency and power sweeps. For those combinations, some timing restrictions apply. Check the SCPI command reference for further details.

Some combinations may be available only using the GUI or custom remote programming sequences, but not on the front panel.

Table 6-e: Possible combinations of internal and external modulation and the internal LF generator output.

Remarks

1. [1] Combining AM and FM/PM is available to 835/845 only.
2. [2] Enable AM first since active chirp disables live update of other settings.
3. [3] In ALC on mode.

Table 6-f: Possible combinations of internal and external modulation and sweeps.

Remarks

1. [1] AM, FM, PM modulated carrier sweep is available to 835/845 only.
2. [2] Enable modulation first since active sweep disables live update of other settings.
3. [3] In ALC on mode.

11. Remote Programming: SCPI Command Reference

The signal generator can be remotely programmed. This reference provides information for remote operation of the Berkeley Nucleonics Signal Generators using commands sent from an external controller via Ethernet, USB, or GPIB. It includes the following:

• A general description of the LAN and the bus data transfer and control functions
• A general description of how to establish connection via LAN, USB, or GPIB
• A listing of the IEEE-488 Interface Function Messages recognized by the signal generator with a description of its response
• A complete listing and description of all the Standard Commands for Programmable Instruments (SCPI) commands that can be used to control signal generator operation with examples of command usage

Programming the Instrument

All instruments described in this manual can be accessed through LAN, USB or GIPB interface. All interfaces use standard SCPI command set to pass commands to the device.

While LAN is the preferred interface for Berkeley Nucleonics instruments, GPIB is only optionally available for some models.

Ethernet LAN

All Berkeley Nucleonics signal generators are preferably remotely programmed via a 10/100Base-T LAN interface and LAN- connected computer using one of several LAN interface protocols. The LAN allows instruments to be connected together and controlled by a LAN based computer. LAN and its associated interface operations are defined in the IEEE 802.2 standard.

All instruments support the following LAN interface protocols:

• Socket based LAN. The application programming interface (API) provided with the instrument supports general programming using the LAN interface under Windows operating system.
• VXI-11.
• Telephone Network (TELNET): TELNET is used for interactive, one command at a time instrument control.
• Internet protocol optionally supported

For LAN operation, the signal generator must be connected to the LAN, and an IP address must be assigned to the signal generator either manually or by using DHCP client service. Your system administrator can tell you which method to use. Most current LAN networks use DHCP.

DHCP Configuration

If the DHCP server uses dynamic DNS to link the hostname with the assigned IP address, the hostname may be used in place of the IP address. Otherwise, the hostname is not usable.

Ethernet Interface Connection and Setup

The instrument fully supports the IEEE-802.3 standard. Most front panel functions (except power on/off) can be remotely controlled via a network server and an Ethernet connection. The instrument firmware supports the TCP/IP network protocol.

Ethernet uses a bus or star topologies where all of the interfacing devices are connected to a central cable called the bus or are connected to a hub. Ethernet uses the CSMA/CD access method to handle simultaneous transmissions over the bus. CSMA/CD stands for Carrier Sense Multiple Access/Collision Detection. This standard enables network devices to detect simultaneous data channel usage, called a collision, and provides for a contention protocol. When a network device detects a collision, the CSMA/CD standard dictates that the data will be retransmitted after waiting a random amount of time. If a second collision is detected, the data is again retransmitted after waiting twice as long. This is known as exponential back off.

The TCP/IP setup requires the following:

• IP Address. Every computer/electronic device in a TCP/IP network requires an IP address. An IP address has four numbers (each between 0 and 255) separated by periods. For example: 192.168.1.50 is a valid IP address.
• Subnet Mask. The subnet mask distinguishes the portion of the IP address that is the network ID from the portion that is the station ID. The subnet mask 255.255.0.0, when applied to the IP address given above, would identify the network ID as 192.168 and the station ID as 1.50. All stations in the same local area network should have the same network ID, but different station IDs.
• Default Gateway. A TCP/IP network can have a gateway to communicate beyond the LAN identified by the network ID. A gateway is a computer or electronic device that is connected to two different networks and can move TCP/IP data from one network to the other. A single LAN that is not connected to other LANs requires a default gateway setting of 0.0.0.0. If you have a gateway, then the default gateway would be set to the appropriate value of your gateway.
• MAC Address. A MAC address is a unique 48-bit value that identifies a network interface card to the rest of the network. Every network card has a unique MAC address permanently stored into its memory.

Interface between the instrument and other devices on the network is connected to a network via a category five (CAT-5) interface cable. This cable uses four twisted pairs of copper insulators terminated into an RJ45 connector. CAT-5 cabling is capable of supporting frequencies up to 100 MHz and data transfer speeds up to 1 Gbps, which accommodates 1000Base-T, 100Base-T, and 10Base-T networks.

Generally, a VISA I/O library (like NI-VISA™) is used on the server side to facilitate the communications. A VISA installation on the controller is a prerequisite for remote control over LAN interface. VISA is a standardized software interface library providing input and output functions to communicate with instruments. For more information about VISA refer to the VISA library supplier's documentation.

Only the IP address or the device name is required for link setup. The IP address/device name is part of the "visa resource string" used by the programs for identification and control of the instrument. The visa resource string has the form:

TCPIP::ipaddr::inst0::INSTR

ipaddr has to be replaced by the IP address or the computer name of the instrument.

For instance, if the instrument has the IP address 192.168.1.50, TCPIP::192.168.1.50::inst0::INSTR is the valid resource name. Specification of inst0 in the resource name is optional. In this example, also TCPIP::192.168.1.50::INSTR is therefore a valid resource name.

TCPIP designates the network protocol used and INSTR indicates that the VXI-11 protocol is used. If several instruments are connected to the network, each instrument has its own IP address and associated resource name. The controller identifies these instruments by means of the resource name.

Using Sockets LAN

Sockets LAN is a method used to communicate with the signal generator over the LAN interface using the Transmission Control Protocol/Internet Protocol (TCP/IP). A socket is a fundamental technology used for computer networking and allows applications to communicate using standard mechanisms built into network hardware and operating systems. The method accesses a port on the signal generator from which bidirectional communication with a network computer can be established.

Sockets LAN can be described as an internet address that combines Internet Protocol (IP) with a device port number and represents a single connection between two pieces of software. The socket can be accessed using code libraries packaged with the computer operating system. Two common versions of socket libraries are the Berkeley Sockets Library for UNIX systems and Winsock for Microsoft operating systems.

Your signal generator implements a socket Applications Programming Interface (API) that is compatible with Berkeley socket for UNIX systems and Winsock for Microsoft systems. The signal generator is also compatible with other standard sockets APIs. The signal generator can be controlled using predefined SCPI functions once the socket connection is established in your program. Socket connection is available on port 18.

Using and Configuring VXI-11 (VISA)

The signal generator supports the LAN interface protocol described in the VXI-11 standard. VXI-11 is an instrument control protocol based on Open Network Computing/Remote Procedure Call (ONC/RPC) interfaces running over TCP/IP.

A range of standard software such as NI-VISA or Agilent IO Config is available to setup the computer-signal generator interface for the VXI- 11 protocol. Please refer to the applicable software user manual and documentation for information on running the program and configuring the VXI-11 interface. The program is used to configure the LAN client. Once the computer is configured for a LAN client, you can use the VXI- 11 protocol and the VISA library to send SCPI commands to the signal generator over the LAN interface. Example programs are available on request info@berkeleynucleonics.com.

VISA is an IO library used to develop IO applications and instrument drivers that comply with industry standards. It is recommended to use the VISA library for programming the signal generator. The NI-VISA and Agilent VISA libraries are similar implementations of VISA and have the same commands, syntax, and functions.

Using Telnet LAN (Port 18)

Telnet provides a means of communicating with the signal generator over the LAN. The Telnet client, run on a LAN connected computer, will create a remote session to the signal generator. A connection, established between the computer and signal generator, generates a user interface display for the user.

Using the Telnet protocol to send commands to the signal generator is similar to communicating with the signal generator over LAN. You establish a connection with the signal generator and then send or receive information using predefined commands. Communication is interactive: one command at a time. The Telnet service is available on port 18, by default. Also, by default, signal generator does not echo commands the user type in and in some telnet program (eg: Windows TELNET) also does not print the command the user type so it is maybe necessary to send a command

SYST:COMM:SOCK:ECHO ON

for the user commands to become visible on the display

USB (USBTMC)

All instruments support the following USB interface protocols:

• USBTMC class device via VISA. USBTMC stands for USB Test & Measurement Class. USBTMC is a protocol built on top of USB that allows GPIB-like communication with USB devices. From the user's point of view, the USB device behaves just like a GPIB device. USBTMC allows instrument manufacturers to upgrade the physical layer from GPIB to USB while maintaining software compatibility with existing software such as instrument drivers and any application that uses VISA. This is also what the VXI-11 protocol provides for TCP/IP.
• USBTMC with IVI drivers. the application programming interface (API) provided with the instrument supports general programming using the USB interface under Windows operating system using the IVI drivers.

USBTMC class device requires the physical layer from GPIB to USB while maintaining software compatibility with existing software such as instrument drivers and any application that uses VISA. This is also what the VXI-11 protocol provides for TCP/IP. You can then use this resource to access the signal generator using the GPIB specific functions.

USBTMC upgrades the physical layer from GPIB to USB while maintaining software compatibility with existing software such as instrument drivers and any application that uses VISA. The new device will appear in MAX under Device and Interfaces > USB Devices. You can then use this resource name as you would use any GPIB resource.

USB-TMC Connection and Setup using VISA

USBTMC stands for USB Test & Measurement Class. USBTMC is a protocol built on top of USB that allows GPIB-like communication with USB devices. From the user's point of view, the USB device behaves just like a GPIB device. The USBTMC protocol supports service request, triggers and other GPIB specific operations.

USBTMC upgrades the physical layer from GPIB to USB while maintaining software compatibility with existing software such as instrument drivers and any application that uses VISA. This is also what the VXI-11 protocol provides for TCP/IP.

NI-VISA 3.0 or later allows you to communicate as a controller to Model 870A devices. NI VISA is configured to detect USBTMC compliant instruments such as the Model 870A. To use such a device, plug it in and Windows should detect the new hardware and launch the New Hardware Wizard. Instruct the wizard to search for the driver, which in this case is NI-VISA. If NI-VISA is properly installed, the device will be installed as a USB Test & Measurement Class Device. Open Measurement & Automation Explorer (MAX). The new device will appear in MAX under Device and Interfaces > USB Devices. You can then use this resource name as you would use any GPIB resource.

USB-TMC Connection and Setup using BNC API

BNC's API programming interface supports direct communication to instruments using BNC's proprietary DLL driver libraries.

Please contact BNC for more detailed documentation, programming samples, and updates on the DLL library.

GPIB Interface Connection and Setup

General GPIB information

GPIB (General Purpose Interface Bus) is an interface standard for connecting computers and peripherals, which supports the following international standards: IEEE 488.1, IEC 625, IEEE 488.2, and JIS C1901. The GPIB interface allows you to control the APPH from an external computer. The computer sends commands and instructions to the APPH and receives data sent from the APPH via GPIB.

You can connect up to 15 devices in a single GPIB system.

The length of cables to connect between devices must be 4 m or less. The total length of connecting cables in a single GPIB system must be 2 m × the number of connected devices (including the controller) or less. You cannot construct the system in which the total cable length exceeds 20 m.

You cannot connect more than four devices to an individual device must be 4 m or less. If you connect 5 or more connectors, excessive force is applied to the connector part, which may result in failure.

You can choose the device connection topology from star, linear, and combined. Loop connection is not allowed.

SCPI Commands

The Standard Commands for Programmable Instrumentation (SCPI) provides a uniform and consistent language to control programmable test and measurement devices in instrumentation systems. The SCPI Standard is built on the foundation of IEEE 488.2, Standard Codes and Formats. It requires conformance to IEEE 488.2, but is pure software standard. SCPI syntax is ASCII text, and therefore can be attached to any computer test language such as BASIC, C, or C++. It can also be used with Test Application Environments such as LabWindows/CVI, LabVIEW™, or Matlab®. SCPI is hardware independent. SCPI strings can be sent over any instrument interface. It works equally well over USB-TMC, GPIB, RS-232, VXIbus or LAN networks.

Please see the chapter 4 for detailed description of supported SCPI commands.

IEEE-488 Interface Commands

IEEE Mandated and Optional Common Commands

The required common commands are IEEE-488.2 mandated commands that are defined in the IEEE-488.2 standard and must be implemented by all SCPI compatible instruments. These commands are identified by the asterisk (*) at the beginning of the command keyword. These commands are used to control instrument status registers, status reporting, synchronization, and other common functions.

Commands declared mandatory by IEEE 488.2.

• *CLS Clear Status Command
• *ESE Standard Event Status Enable Command
• *ESE? Standard Event Status Enable Query
• *ESR? Standard Event Status Register Query
• *IDN? Identification Query
• *OPC Operation Complete Command
• *OPC? Operation Complete Query
• *RST Reset Command
• *SRE Service Request Enable Command
• *SRE? Service Request Enable Query
• *STB? Read Status Byte Query
• *TST? Self-Test Query
• *WAI Wait-to-Continue Command

Optional common commands described by IEEE 488.2

• *OPT? Option Identification Query

*CLS

The Clear Status (CLS) command clears the status byte by emptying the error queue and clearing all the event registers including the Data Questionable Event Register, the Standard Event Status Register, the Standard Operation Status Register and any other registers that are summarized in the status byte.

*ESE<data>

The Standard Event Status Enable (ESE) command sets the Standard Event Status Enable Register. The variable <data> represents the sum of the bits that will be enabled.

Range 0-255

Remarks The setting enabled by this command is not affected by signal generator preset or *RST. However, cycling the signal generator power will reset this register to zero.

*IDN?

The Identification (IDN) query outputs an identifying string. The response will show the following information: <company name>, <model number>, <serial number>, <firmware revision>

*OPC

The Operation Complete (OPC) command sets bit 0 in the Standard Event Status Register when all pending operations have finished.

The Operation Complete command causes the device to set the operation complete bit (bit 0) in the Standard Event Status Register when all pending operations have been finished.

*OPC?

The Operation Complete (OPC) query returns the ASCII character 1 in the Standard Event Status Register when all pending operations have finished.

This query stops any new commands from being processed until the current processing is complete. This command blocks the communication until all operations are complete (i.e. the timeout setting should be longer than the longest sweep).

*OPT?

The options (OPT) query returns a comma-separated list of all currently installed instrument options on the signal generator.

Common returned option strings are:

Further options are available for different signal generator model. Please refer to the Data Sheet for a complete list of options supported by a particular instrument.

*RCL<reg>

The Recall (RCL) command recalls the state from the specified memory register <reg>.

*RST

The Reset (RST) command resets most signal generator functions to factory- defined conditions.

Remarks Each command shows the [*RST] default value if the setting is affected.

*SAV <reg>

The Save (SAV) command saves signal generator settings to the specified memory register <reg>.

Remarks The save function does not save all signal generator settings. Refer to the User's Guide for more information on the save function.

*SRE<data>

The Service Request Enable (SRE) command sets the value of the Service Request Enable Register. The variable <data> is the decimal sum of the bits that will be enabled. Bit 6 (value 64) is ignored and cannot be set by this command.

Range 0-255

The setting enabled by this command is not affected by signal generator preset or *RST. However, cycling the signal generator power will reset it to zero.

*SRE?

The Service Request Enable (SRE) query returns the value of the Service Request Enable Register.

Range 0-63 & 128-191

*STB?

The Read Status Byte (STB) query returns the value of the status byte including the master summary status (MSS) bit.

Range 0-255

*TRG

The Trigger (TRG) command triggers the device if LAN is the selected trigger source, otherwise, *TRG is ignored.

*TST?

The Self-Test (TST) query initiates the internal self- test and returns one of the following results:

• 0 This shows that all tests passed.
• 1 This shows that one or more tests failed.

*WAI

The Wait- to- Continue (WAI) command causes the signal generator to wait until all pending commands are completed, before executing any other commands.

SCPI Commands

This chapter provides an introduction to SCPI programming that includes descriptions of the command types, hierarchical command structure, data parameters, and notational conventions. Information on Model 870A status system and trigger system programming is also provided.

Introduction

Standard Commands for Programmable Instruments (SCPI) is the new instrument command language for controlling instruments that goes beyond IEEE 488.2 to address a wide variety of instrument functions in a standard manner. SCPI promotes consistency, from the remote programming standpoint, between instruments of the same class and between instruments with the same functional capability. For a given measurement function such as frequency or voltage, SCPI defines the specific command set that is available for that function. Thus, two oscilloscopes made by different manufacturers could be used to make frequency measurements in the same way. It is also possible for a SCPI counter to make a frequency measurement using the same commands as an oscilloscope. SCPI commands are easy to learn, self-explanatory and account for both novice and expert programmer's usage. Once familiar with the organization and structure of SCPI, considerable efficiency gains can be achieved during control program development, independent of the control program language selected.

A key to consistent programming is the reduction of multiple ways to control similar instrument functions. The philosophy of SCPI is for the same instrument functions to be controlled by the same SCPI commands. To simplify learning, SCPI uses industry-standard names and terms that are manufacturer and customer supported.

The advantage of SCPI for the ATE system programmer is reducing the time learning how to program new SCPI instruments after programming their first SCPI instrument.

Programmers who use programming languages such as BASIC, C, FORTRAN, etc., to send instrument commands to instruments will benefit from SCPI. Also, programmers who implement instrument device drivers for ATE program generators and/or software instrument front panels will benefit by SCPI's advantages. SCPI defines instrument commands, parameters, data, and status. It is not an application package, programming language or software intended for instrument front panel control.

SCPI is designed to be layered on top of the hardware-independent portion of IEEE 488.2.

SCPI Command Types

SCPI commands, which are also referred to as SCPI instructions, are messages to the instrument to perform specific tasks. The Model 870A command set includes:

• "Common" commands (IEEE488.2 mandated commands)
• SCPI required commands
• SCPI optional commands (per SCPI 1999.0)
• SCPI compliant commands that are unique to the Model 870A. Not all of the commands supported by the instrument are taken from the SCPI standard; however, their syntax follows SCPI rules.

SCPI Command Syntax

Typical SCPI commands consist of one or more keywords, parameters, and punctuation. SCPI command keywords can be a mixture of upper and lower case characters. Except for common commands, each keyword has a long and a short form. In this manual, the long form is presented with the short form in upper case and the remainder in lower case. Unrecognized versions of long form or short form commands, or improper syntax, will generate an error.

Structure of a Command Line

A command line may consist of one or several commands. It is terminated by an EOI together with the last data byte.

Several commands in a command line must be separated by a semicolon ";". If the next command belongs to a different command system, the semicolon is followed by a colon. A colon ":" at the beginning of a command marks the root node of the command tree.

If the successive commands belong to the same system, having one or several levels in common, the command line can be abbreviated. To this end, the second command after the semicolon starts with the level that lies below the common levels. The colon following the semicolon must be omitted in this case.

Responses to Queries

A query is defined for each setting command unless explicitly specified otherwise. It is formed by adding a question mark to the associated setting command. According to SCPI, the responses to queries are partly subject to stricter rules than in standard IEEE 488.2.

Parameters

Most commands require a parameter to be specified. The parameters must be separated from the header by a "white space". Permissible parameters are numerical values, Boolean parameters, text, character strings and block data. The type of parameter required for the respective command and the permissible range of values are specified in the command description.

• Numerical values. Numerical values can be entered in any form, i.e. with sign, decimal point and exponent. Values exceeding the resolution of the instrument are rounded up or down. The mantissa may comprise up to 255 characters, the values must be in the value range −9.9E37 to 9.9E37. The exponent is introduced by an "E" or "e". Entry of the exponent alone is not allowed.
• Units. In the case of physical quantities, the unit can be entered. Permissible unit prefixes are G (giga), MA (mega), MHZ are also permissible), K (kilo), M (milli), U (micro) and N (nano). If the unit is missing, the basic unit is used.
• Boolean Parameters. Boolean parameters represent two states. The ON state (logically true) is represented by ON or a numerical value unequal to 0. The OFF state (logically false) is represented by OFF or the numerical value 0. ON or OFF is returned by a query.

Hierarchical Command Structure

All SCPI commands, except the common commands, are organized in a hierarchical structure similar to the inverted tree file structure used in most computers. The SCPI standard refers to this structure as "the Command Tree." The command keywords that correspond to the major instrument control functions are located at the top of the command tree. The command keywords for the Model 870A SCPI command set are shown below.

• :ABORt
• :DIAGnostic
• :DISPlay
• :INITiate
• :OUTput
• :SOURce
• :STATus
• :SYSTem
• :TRIGger
• :UNIT

All Model 870A SCPI commands, except the :ABORt command, have one or more subcommands (keywords) associated with them to further define the instrument function to be controlled. The subcommand keywords may also have one or more associated subcommands (keywords). Each subcommand level adds another layer to the command tree. The command keyword and its associated subcommand keywords form a portion of the command tree called a command subsystem.

Status System Programming

The Model 870A implements the status byte register, the Service Request Enable Register, the Standard Event Status Register, and the Standard Event Status Enable Register.

The Model 870A status system consists of the following SCPI-defined status reporting structures:

• The Instrument Summary Status Byte
• The Standard Event Status Group
• The Operation Status Group
• The Questionable Status Group

The following paragraphs describe the registers that make up a status group and explain the status information that each status group provides.

Status Registers

In general, a status group consists of a condition register, a transition filter, an event register, and an enable register. Each component is briefly described in the following paragraphs.

Condition Register

The condition register is continuously updated to reflect the current status of the Model 870A. There is no latching or buffering for this register, it is updated in real time. Reading the contents of a condition register does not change its contents.

Transition Filter

The transition filter is a special register that specifies which types of bit state changes in the condition register will set corresponding bits in the event register. Negative transition filters (NTR) are used to detect condition changes from True (1) to False (0); positive transition filters (PTR) are used to detect condition changes from False (0) to True (1). Setting both positive and negative filters True (1) allows an event to be reported each time the value changes. Resetting both filters False (0) disables event reporting. The action of these filters is paralleled by a query of a *CLS command result.

Event Register

The event register latches transition events from the condition register as specified by the transition filter. Bits in the event register are latched, and once set they remain set until cleared by a query or a *CLS command. Event registers are read only.

Enable Register

The enable register specifies the bits in the event register that can produce a summary bit. The Model 870A logically ANDs corresponding bits in the event and enable registers, and ORs all the resulting bits to obtain a summary bit. Summary bits are recorded in the Summary Status Byte. Enable registers are read-write. Querying an enable register does not affect it. The command :STATus:PRESet sets the Operation Status Enable register and the Questionable Status Enable register to all 0's.

Status Group Reporting

The state of certain Model 870A hardware and operational events and conditions can be determined by programming the status system. Three lower status groups provide status information to the Summary Status Byte group. The Summary Status Byte group is used to determine the general nature of an event or condition and the other status groups are used to determine the specific nature of the event or condition.

Summary Status Byte Group

The Summary Status Byte group, consisting of the Summary Status Byte Enable register and the Summary Status Byte, is used to determine the general nature of an Model 870A event or condition. The bits in the Summary Status Byte provide the following:

Operation Status Group

The Operation Status group, consisting of the Operation Condition register, the Operation Positive Transition register, the Operation Negative Transition register, the Operation Event register and the Operation Event Enable register.

Standard Event Status Group

The Standard Event Status group, consisting of the Standard Event Status register (an Event register) and the Standard Event Status Enable register, is used to determine the specific event that set bit 5 of the Summary Status Byte.

The bits in the Standard Event Status register provide the following:

Standard Event Status Enable register (ESE commands)

Operation Status Group

The Operation Status group, consisting of the Operation Condition register, the Operation Positive Transition register, the Operation Negative Transition register, the Operation Event register, and the Operation Event Enable register, is used to determine the specific condition that set bit 7 in the Summary Status Byte.

Related commands are covered by the :STATus Subsystem chapter.

The bits in the Operation Event register provide the following:

Questionable Status Group

The Questionable Status group, consisting of the Questionable Condition register, the Questionable Positive Transition register, the Questionable Negative Transition register, the Questionable Event register, and the Questionable Event Enable register, is used to determine the specific condition that set bit 3 in the Summary Status Byte.

Related commands are covered by the :STATus Subsystem chapter.

The bits in the Questionable Status register provide the following:

:ABORt Subsystem

The :ABORt command is a single command subsystem. There are no subcommands or associated data parameters, as shown below. The :ABORt command, along with the :TRIGger and :INITiate commands, comprise the Trigger group of commands.

:ABORt

This command causes the List or Step sweep in progress to abort. Even if INIT:CONT[:ALL] is set to ON, the sweep will not immediately re-initiate.

:DISPlay Subsystem

The :DISPlay subsystem configures the front panel display.

:DISPlay:ENABle

:DISPlay:ENABle ON|OFF|1|0
:DISPlay:ENABle?

Enables or disables the front panel display.

When disabled, the display does not show any device information. This mode can not be left via front panel display control. Only re-enabling the display via remote control or power cycling brings the front panel display back to normal operation.

Disabling the front panel display by this command can be used to hide confidential settings.

Refer to :SYSTem:LOCK for locking the front panel without hiding device settings.

*RST ON

:INITiate Subsystem

The :INITiate subsystem controls the state of the trigger system. The subsystem commands and parameters are described below. The :INITiate commands, along with the :ABORt and :TRIGger commands, comprise the Trigger Group of commands.

:INITiate[:IMMediate]

Sets trigger to the armed state.

:INITiate:CONTinuous ON|OFF|1|0

When enabled, continuously rearms the trigger system after completion of a triggered sweep.

:OUTPut Subsystem

Channel selection for multi-channel devices

Commands applying to a single channel use the <ch> field. Commands that are common to all channels have no <ch> field.

The target channel of such commands under the OUTPut subsystem can be defined by appending the channel index to the OUTPut node: <ch> is 1 to number of channels.

If <ch> is omitted, the command targets the currently selected default channel.

Default channel selection

Default output channel is coupled to default source channel. Refer to [SOURce:]SELect for default channel selection.

[:STATe] ON|OFF|1|0

:OUTPut<ch>[:STATe] ON|OFF|1|0
:OUTPut<ch>[:STATe]?

Turns RF output power on/off.

:BLANking[:STATe] ON|OFF|1|0

:OUTPut<ch>:BLANking[:STATe] ON|OFF|1|0
:OUTPut<ch>:BLANking[:STATe]?

ON causes the RF output to be turned off (blanked) during frequency changes. OFF leaves RF output turned on (unblanked).

*RST OFF on all devices except Model 875.

[:SOURce<ch>] Subsystem

Channel selection for multi-channel devices

Commands applying to a single channel use the <ch> field. Commands that are common to all channels have no <ch> field.

The target channel of such commands under the SOURce subsystem can be defined by appending the channel index to the SOURce node: <ch> is 1 to number of channels.

If <ch> is omitted, the command targets the currently selected default channel.

:SELect

[:SOURce]:SELect <channel>
[:SOURce]:SELect?

For multi-channel devices, this command sets the default channel. Any command with channel index <ch> omitted applies to the default channel. This command sets the default channel of the following systems:

:MEMory

:OUTput

:SOURce

*RST 1

Range 1 to number of channels.

[:SOURce<ch>]:FREQuency Subsystem

FREQuency:FIXed|CW]

[:SOURce<ch>]:FREQuency[:CW] <float>
[:SOURce<ch>]:FREQuency[:CW]?

This command sets the signal generator output frequency for the CW frequency mode.

*RST 100 MHz

Range Please refer to the Data Sheet.

Unit Hz

FREQuency:CENTer

[:SOURce<ch>]:FREQuency:CENTer <float>
[:SOURce<ch>]:FREQuency:CENTer?

This command sets the sweep center frequency.

*RST 1 GHz

Range Please refer to the Data Sheet.

Unit Hz

FREQuency:MODE

[:SOURce<ch>]:FREQuency:MODE FIXed|CW|SWEep|LIST|CHIRp
[:SOURce<ch>]:FREQuency:MODE?

This command sets the frequency mode of the signal generator to CW, (list) sweep or chirp.

*RST FIXed

FREQuency:RESolution

[:SOURce<ch>]:FREQuency:RESolution LOW|HIGH
[:SOURce<ch>]:FREQuency:RESolution?

This command selects the frequency resolution. It is available only for Model 855B devices with limited frequency resolution (serial numbers xxx-xxx5xxxxx-xxxx, xxx-xxx6xxxxx-xxxx, xxx-xxx7xxxxx-xxxx).

*RST LOW

FREQuency:SPAN

[:SOURce<ch>]:FREQuency:SPAN <float>
[:SOURce<ch>]:FREQuency:SPAN?

This command sets the frequency sweep span.

*RST 1 GHz

Range Please refer to the Data Sheet.

Unit Hz

FREQuency:STARt

[:SOURce<ch>]:FREQuency:STARt <float>
[:SOURce<ch>]:FREQuency:STARt?

This command sets the first frequency point in a chirp or step sweep.

*RST 1 GHz

Range Please refer to the Data Sheet.

Unit Hz

FREQuency:STEP

[:SOURce<ch>]:FREQuency:STEP <float>
[:SOURce<ch>]:FREQuency:STEP?

This command sets the frequency step size for sweeps and chirps.

FREQuency:STOP

[:SOURce<ch>]:FREQuency:STOP <float>
[:SOURce<ch>]:FREQuency:STOP?

This command sets the last frequency point in a chirp or step sweep.

*RST 2 GHz

Range Please refer to the Data Sheet.

Unit Hz

FREQuency:TRIGger

[:SOURce<ch>]:FREQuency:TRIGger ON|OFF|1|0

ON causes frequency changes in CW mode to become effective only after receiving a trigger signal. OFF is the normal CW mode with frequency changes taking effect immediately.
This is not supported by Model 875.

*RST OFF

[:SOURce<ch>]:CHIRp Subsystem

The :CHIRp Subsystem allows to run ultrafast quasi-analog frequency sweeps. The frequency can either increase or decrease linear. This is not supported by Model 875.

:CHIRp:COUNt

[SOURce<ch>]:CHIRp:COUNt INFinite|<value>
[SOURce<ch>]:CHIRp:COUNt?

This command specifies the number of repetitions for the chirp. Set to INF for infinite repetitions.

*RST INF

Range INF or 1 to 32767

:CHIRp:TIME

[SOURce<ch>]:CHIRp:TIME <value><unit>
[SOURce<ch>]:CHIRp:TIME?

Sets the time span for the chirp.

*RST 100 µs

Range 100 ns to 10 s

:CHIRp:DIRection

[:SOURce<ch>]:CHIRp:DIRection UD|DU|DOWN|UP
[:SOURce<ch>]:CHIRp:DIRection?

This command sets the direction of the chirp. DU is bidirectional, direction down first. UD is bidirectional, direction up first.

*RST UP

CHIRp:BLANking

[:SOURce<ch>]:CHIRp:BLANking ON|OFF|1|0
[:SOURce<ch>]:CHIRp:BLANking?

This command enables or disables RF output blanking while waiting for the trigger signal. Blanking enabled means the RF output is off while waiting for the trigger event.

*RST ON

FREQuency:CENter

This related command sets the center frequency of a chirp.
Refer to [:SOURce]:FREQuency:CENTer for a detailed command description.

FREQuency:MODE

This related command sets the frequency mode of the signal generator. A chirp can be enabled by selecting chirp mode or disabled by selecting any other mode.
Refer to [:SOURce]:FREQuency:MODE for a detailed command description.

FREQuency:SPAN

This related command sets the frequency span of a chirp.
Refer to [:SOURce]:FREQuency:SPAN for a detailed command description.

FREQuency:STARt

This related command sets the start frequency in a chirp.
Refer to [:SOURce]:FREQuency:STARt for a detailed command description.

FREQuency:STOP

This related command sets the stop frequency in a chirp.
Refer to [:SOURce]:FREQuency:STOP for a detailed command description.

[:SOURce<ch>]:PHASe Subsystem

:PHASe:REFerence

[SOURce<ch>]:PHASe:REFerence

This command sets the current output phase as a zero reference. Subsequent phase adjustments are set relative to the new reference.

PHASe[:ADJust]

[SOURce<ch>]:PHASe[:ADJust] <float>
[SOURce<ch>]:PHASe[:ADJust]?

This command adjusts the phase of the signal.

*RST 0 rad

Range -1e10 to +1e10 rad

Unit rad|deg

PHASe:CENTer

[SOURce<ch>]:PHASe:CENTer <float>
[SOURce<ch>]:PHASe:CENTer?

This command sets the sweep center phase.

*RST 3.14 rad

Range Please refer to the Data Sheet.

Unit rad|deg

PHASe:COMPensation

[SOURce<ch>]:PHASe:COMPensation <float>
[SOURce<ch>]:PHASe:COMPensation?

This command sets the electrical length compensation. It compensates phase shift introduced by external transmission lines.

*RST 0 s

Range -1e10 to +1e10 s

Unit s

PHASe:MEMory:RESTart

[SOURce<ch>]:PHASe:MEMory:RESTart

For devices with option PHS this command restarts phase memory. Phase memory aligns the output signal phase such that for any frequency a zero crossing occurs at the same reference point in time. Restart resets this reference point in time.

PHASe:MEMory:STATe

[SOURce<ch>]:PHASe:MEMory:STATe ON|OFF|1|0
[SOURce<ch>]:PHASe:MEMory:STATe?

Enables or disables phase memory and thus phase coherent switching.

Disabling phase memory (phase coherent switching) improves frequency switching speed for applications that do not require deterministic RF output phases. Please refer to the Data Sheet for details.

This command is available for devices featuring the PH5 (phase coherent switching) only.

*RST ON

PHASe:MODE

[:SOURce<ch>]:PHASe:MODE FIXed|CW|SWEep|LIST
[:SOURce<ch>]:PHASe:MODE?

This command sets the phase mode of the signal generator to CW or (list) sweep.

*RST FIXed

PHASe:SPAN

[SOURce<ch>]:PHASe:SPAN <float>
[SOURce<ch>]: PHASe:SPAN?

This command sets the phase sweep span.

*RST 6.28 rad

Range -1e10 to +1e10 rad

Unit rad|deg

PHASe:STARt

[:SOURce<ch>]:PHASe:STARt <float>
[:SOURce<ch>]:PHASe:STARt?

This command sets the first phase point in a sweep.

*RST 0 rad

Range -1e10 to +1e10 rad

Unit rad|deg

PHASe:STEP

[:SOURce<ch>]:PHASe:STEP?

This query returns the phase step size for a sweep.

Unit rad

PHASe:STOP

[:SOURce<ch>]:PHASe:STOP <float>
[:SOURce<ch>]:PHASe:STOP?

This command sets the last phase point in a sweep.

*RST 6.28 rad

Range -1e10 to +1e10 rad

Unit rad|deg

[:SOURce<ch>]:POWer Subsystem

POWer[:LEVel][:IMMediate][:AMPLitude]

[:SOURce<ch>]:POWer[:LEVel][:IMMediate][:AMPLitude] <float>
[:SOURce<ch>]:POWer[:LEVel][:IMMediate][:AMPLitude]?

This command sets the RF output power.

*RST 0 dBm

Unit dBm|dBu|dBW|W|dBuV|dBmV|dBV|V|dBuA|dBmA|dBA|A

POWer:CENTer

[:SOURce<ch>]:POWer:CENTer <float>
[:SOURce<ch>]:POWer:CENTer?

This command sets the sweep center amplitude.

*RST -5 dBm

Range Please refer to the Data Sheet.

Unit dBm|dBu|dBW|W|dBuV|dBmV|dBV|V|dBuA|dBmA|dBA|A

POWer:MODE

[:SOURce<ch>]:POWer:MODE CW|LIST|SWEep
[:SOURce<ch>]:POWer:MODE?

This command sets the signal generator power mode to fixed or swept.

*RST FIXed

POWer:SPAN

[:SOURce<ch>]:POWer:SPAN <float>
[:SOURce<ch>]:POWer:SPAN?

This command sets the amplitude sweep span.

*RST +30 dB

Range Please refer to the Data Sheet.

Unit dB

POWer:STARt

[:SOURce<ch>]:POWer:STARt <float>
[:SOURce<ch>]:POWer:STARt?

This command sets the first amplitude point in a sweep.

*RST -20 dBm

Range Please refer to the Data Sheet.

Unit dBm|dBu|dBW|W|dBuV|dBmV|dBV|V|dBuA|dBmA|dBA|A

POWer:STEP

[:SOURce<ch>]:POWer:STEP[:LINear]?

This command sets the amplitude step size for a sweep.

*RST +15 dBm

POWer:STOP

[:SOURce<ch>]:POWer:STOP <value><unit>
[:SOURce<ch>]:POWer:STOP?

This command sets the last amplitude point in a sweep.

*RST +10 dBm

Range Please refer to the Data Sheet.

Unit dBm|dBu|dBW|W|dBuV|dBmV|dBV|V|dBuA|dBmA|dBA|A

POWer:ALC[:STATe]

[:SOURce<ch>]:POWer:ALC[:STATe] ON|OFF|1|0
[:SOURce<ch>]:POWer:ALC[:STATe]?

This command turns the ALC (automatic levelling control) on or off. Specified output power is guaranteed only with ALC on.

For information about how to use different ALC modes please refer to application note ALC.

*RST ON

POWer:ALC:BWIDth|BANDwidth

[:SOURce<ch>]:POWer:ALC:BWIDth|BANDwidth LOW|HIGH
[:SOURce<ch>]:POWer:ALC:BWIDth|BANDwidth?

This command selects the ALC (automatic levelling control) bandwidth.

When automatic ALC bandwidth selection is active, the device chooses the appropriate bandwidth setting automatically.
Setting the ALC bandwidth manually with this command disables automatic bandwidth selection.
Refer to the [:SOURce<ch>]:POWer:ALC:BWIDth|BANDwidth:AUTO command.
For information about how to use different ALC modes please refer to application note ALS.

*RST LOW (automatic)

POWer:ALC:BWIDth|BANDwidth:AUTO

[:SOURce<ch>]:POWer:ALC:BWIDth|BANDwidth:AUTO ON|OFF|1|0
[:SOURce<ch>]:POWer:ALC:BWIDth|BANDwidth:AUTO?

This command enables or disables automatic ALC bandwidth selection. Enabling automatic ALC bandwidth selection lets the device select the appropriate ALC bandwidth setting automatically. Refer to the [:SOURce<ch>]:POWer:ALC:BWIDth|BANDwidth command.

For information about how to use different ALC modes please refer to application note ALS.

*RST ON

POWer:ALC:LOWNoise

[:SOURce<ch>]:POWer:ALC:LOWNoise ON | OFF | 1 | 0
[:SOURce<ch>]:POWer:ALC:LOWNoise?

This command enables or disables the low amplitude noise mode providing up to 1/1000 dB output power resolution. When enabled, the automatic levelling control will work in a mode similar to hold. In opposite to the hold mode:

• The hold setpoint won't be sampled again when changing the output power setting using the [:SOURce<ch>]:POWer[:LEVel][:IMMediate][:AMPLitude] command.
• The hold setpoint won't be sampled again when turning RF on or off using the :OUTPut<ch>[:STATe] command.

Switching speed (power and frequency) degrades. Sweeps and modulations are not available in low amplitude noise mode.

*RST OFF

POWer:ALC:SEARch

[:SOURce<ch>]:POWer:ALC:SEARch ON|OFF|1|0|ONCE
[:SOURce<ch>]:POWer:ALC:SEARch?

This command controls when the level correction occurs in ALC hold on mode. See [:SOURce<ch>]:POWer:ALC:HOLD command.

*RST ON

POWer:ALC:HOLD

[:SOURce<ch>]:POWer:ALC:HOLD ON|OFF|1|0
[:SOURce<ch>]:POWer:ALC:HOLD?

This command sets the automatic level control into hold mode. The amplitude level control loop is open. ALC hold can improve power stability when fast sweeps or modulations are active.
When automatic ALC hold mode selection is active, the device chooses the appropriate ALC hold setting automatically.
Setting the ALC hold state manually with this command disables automatic ALC hold mode selection.
Refer to the [:SOURce<ch>]:POWer:ALC:HOLD:AUTO command.
For information about how to use different ALC modes please refer to application note ALS.

*RST OFF (automatic)

[:SOURce<ch>]:POWer:ALC:HOLD:AUTO

[:SOURce<ch>]:POWer:ALC:HOLD:AUTO ON|OFF|1|0
[:SOURce<ch>]:POWer:ALC:HOLD:AUTO?

This command enables or disables automatic ALC hold mode selection. Enabling automatic ALC hold mode selection lets the device select the appropriate ALC hold mode setting.

Refer to the [:SOURce<ch>]:POWer:ALC:HOLD command.

For information about how to use different ALC modes please refer to application note ALS.

*RST ON

[:SOURce<ch>]:POWer:ATTenuation <value>

[:SOURce<ch>]:POWer:ATTenuation?

This command sets the power range extension attenuator. This command will also turn off automatic attenuation setting. Refer to [:SOURce<ch>]:POWer:ATTenuation:AUTO for details. Attenuator input RF power shall be in the power range with no external attenuation option as specified in the Data Sheet. Typical range is -20...+10 dBm. For example, using a [:SOURce<ch>]:POWer:ATTenuation value of 50 dB, the output RF power range is -70...-40 dBm.

*RST 0

Range Please refer to the Data Sheet.

Unit dBm

[:SOURce<ch>]:POWer:ATTenuation:AUTO

[:SOURce<ch>]:POWer:ATTenuation:AUTO ON|OFF|1|0
[:SOURce<ch>]:POWer:ATTenuation:AUTO?

(Devices with option PE only)

This command turns the power range extension on or off.

Turning it off allows fast power sweeps for devices featuring an extended output power range, but the programmable output power range is reduced. See [:SOURce<ch>]:POWer:ATTenuation for details. Turning it on will immediately restore the automatic power range extension setting for the currently active [:SOURce<ch>]:POWer[:LEVel][:IMMediate][:AMPLitude] output power setting.

*RST 0

[:SOURce<ch>]:POWer:ATTenuation:LIST?

(Devices with option PE only)

[:SOURce<ch>]:CORRection Subsystem

The flatness correction system provides power correction over frequency. Gain or loss of external components can be compensated.

Flatness correction is global and common to all channels.

FLATness:MODE

[:SOURce]:CORRection:FLATness:MODE LOWer|HIGHer|INTerpolation
[:SOURce]:CORRection:FLATness:MODE?

This command determines the flatness correction value will be determined at frequency settings below, above or by interpolation between the given correction pairs.

• LOWer. Selects the pair at or below an output frequency setting.
• HIGHer. Selects the pair at or above the output frequency setting.
• INTerpolation. Selects linear interpolation between the two pairs closest to the output frequency setting.

FLATness:PAIR

[:SOURce]:CORRection:FLATness:PAIR <float(frequency)>,<float(power)>
[:SOURce]:CORRection:FLATness:PAIR? <integer>

This command adds or changes a frequency and amplitude correction pair. The maximum number of points that can be entered is 3201.

The query form returns the frequency and amplitude correction pair at the given point index. The index ranges from 0 to the active (loaded) flatness correction data table.

Example of two points flatness correction (first point 100 MHz, +1 dB; second point 200 MHz, -1 dB):

100000000;1.0Vp

200000000;-1.0;1Vp

FLATness:POINts

[:SOURce]:CORRection:FLATness:POINts?

This query returns the number of points in the active (loaded) flatness correction data table.

FLATness:PRESet

[:SOURce]:CORRection:FLATness:PRESet

This command presets the user flatness correction to a factory defined setting that consists of one point.

The current correction data will be overwritten once this command is executed. Save the current data if needed. Refer to the :MEMory:FILE:CORRection:FLATness:STORe command for storing user flatness files.

FLATness[:STATe]

[:SOURce]:CORRection:FLATness[:STATe] ON|OFF|1|0
[:SOURce]:CORRection:FLATness[:STATe]?

This command enables or disables the user flatness correction.

*RST OFF

:MEMory:FILE:CORRection:FLATness:DATA

:MEMory:FILE:CORRection:FLATness:DATA {"filename">},<data>
:MEMory:FILE:CORRection:FLATness:DATA? {"filename">}

The command writes data to a list file. If the file name is omitted, data will be loaded to the list RAM. The RAM list will be played when enabling the list mode.

The query returns list file data. If the file name is omitted, list RAM data will be returned.

Data in a binary block format. The data block consists of a header followed by binary data:

<num_digits><byte_count><data table_byte>

<num_digits> specifies how many digits are contained in <byte_count>.

<byte_count> specifies how many data bytes follow in <data_bytes>.

Example of definite block data:

#21130000000;1.0;1.0;1

#21... byte count is two digits wide

#214... 14 data bytes will follow

...100000000;1.0 14 bytes of data

The flatness correction data itself consists of values separated by semicolon ";" and rows separated by carriage return "\r" and/or newline "\n". Two values (frequency in Hz, power correction in dBm) make a row. Each row defines one flatness correction point.

Example of two points flatness correction (first point 100 MHz, +1 dB; second point 200 MHz, -1 dB):

100000000;1.0\r\n

200000000;-1.0;1\r\n

:MEMory:FILE:CORRection:FLATness:LOAD

:MEMory:FILE:CORRection:FLATness:LOAD "<file name>"

This command loads a list file from the non-volatile memory into the list RAM. The RAM list will be played when enabling the list mode.

:MEMory:FILE:CORRection:FLATness:PEEK?

:MEMory:FILE:CORRection:FLATness:PEEK? "<file name>"

This query checks a flatness correction data file. If the file exists, the number of correction points is returned. If there is no such file, 0 is returned.

:MEMory:FILE:CORRection:FLATness:STORe

:MEMory:FILE:CORRection:FLATness:STORe "<file name>"

This command stores list RAM data in a list file.

The FLATness:STORe command, CORRection:FLATness:STORe command. The directory path is implied in the command and need not be specified in the "<file name>" variable.

[:SOURce<ch>]:ROSCillator Subsystem

The ROSCillator subsystem configures internal or external frequency reference.

Reference configuration is global and common to all channels for standard multi-channel devices. For those devices channel index <ch> is ignored and shall be omitted.

Some devices provide optional per channel configuration. Refer to the Data Sheet.

ROSCillator:COUT[:STATe]

[:SOURce<ch>]:ROSCillator:COUT[:STATe] ON|OFF|1|0
[:SOURce<ch>]:ROSCillator:COUT[:STATe]?

(Model 855B devices only)

This command enables or disables the high frequency reference output (CLK OUT) with fixed 5 GHz clock. This output enables a usage in a daisy chained flatness correction data table. The clock signal is buffered and stabilized to provide accurate phase and amplitude. This mode offers the best relative phase stability between daisy-chained Model 855B devices.

*RST OFF

ROSCillator:EXTernal:FREQuency

[:SOURce<ch>]:ROSCillator:EXTernal:FREQuency <float>
[:SOURce<ch>]:ROSCillator:EXTernal:FREQuency?

This command sets the frequency of an externally applied reference to the device.

*RST Please refer to the Data Sheet.

Range Please refer to the Data Sheet.

Unit Hz

ROSCillator:EXTernal:VARiable:FREQuency

[:SOURce<ch>]:ROSCillator:EXTernal:VARiable:FREQuency <float>
[:SOURce<ch>]:ROSCillator:EXTernal:VARiable:FREQuency?

This command sets the frequency of an externally applied variable reference to the device. This setting will be used by selecting the EXTVariable reference clock source via the [:SOURce<ch>]:ROSCillator:SOURce EXTVariable command.

*RST Please refer to the Data Sheet.

ROSCillator:LOCKed?

[:SOURce<ch>]:ROSCillator:LOCKed?

This command queries if the configuration is locked to the externally applied reference.

It is equivalent to checking the frequency lock in :STATus:QUEStionable:CONDition.

(Devices with option PE only)

Devices featuring a lock check that affects RF output performance require that the lock test is initiated manually before sending this query. Otherwise the last known (possibly outdated) lock state is returned.

Please refer to [:SOURce<ch>]:ROSCillator:LOCKed:TEST command.

ROSCillator:LOCKed:TEST

[:SOURce<ch>]:ROSCillator:LOCKed:TEST

(Model 855B devices or Model 870A devices with SN xxx-xxBxxxxx only) Only applicable for 10MHz internal and external reference.

This command tests the reference clock lock for devices where the lock test is initiated manually before sending this query. Otherwise the last known (possibly outdated) lock state is returned.

Please refer to [:SOURce<ch>]:ROSCillator:LOCKed? N.B. There should be a delay of at least 3 seconds before querying the result, to ensure that has completed.

ROSCillator:OUTPut[:STATe]

[:SOURce<ch>]:ROSCillator:OUTPut[:STATe] ON|OFF|1|0
[:SOURce<ch>]:ROSCillator:OUTPut[:STATe]?

This command enables or disables the reference output.

*RST OFF

ROSCillator:OUTPut:FREQuency

[:SOURce<ch>]:ROSCillator:OUTPut:FREQuency <value=num>
[:SOURce<ch>]:ROSCillator:OUTPut:FREQuency?

This command selects the reference output frequency.

*RST device specific

Range Please refer to the Data Sheet.

Unit Hz

ROSCillator:SOURce

[:SOURce<ch>]:ROSCillator:SOURce INTernal|EXTernal|SLAVe|EXTVariable|ON
[:SOURce<ch>]:ROSCillator:SOURce?

This command sets the reference clock source.

*RST INTernal

ROSCillator:INTernal:TUNing

[:SOURce<ch>]:ROSCillator:INTernal:TUNing <float>
[:SOURce<ch>]:ROSCillator:INTernal:TUNing?

This command is used to adjust the internal frequency reference. An adjustment range of approx +/- 2.5 ppm can be used with when setting 0.5 +/- 0.5.

*RST device specific

Range 0 to 1 (0.5 +/- 0.5)

[:SOURce<ch>]:LIST Subsystem

Sweep list memory channel selection for multi-channel devices

This is not supported by Model 875.

The target channel of sweep list memory commands under the MEMory subsystem can be defined by appending the channel index to the MEMory node: <ch> is 1 to number of channels.

If <ch> is omitted, the command targets the currently selected default channel.

LIST:COUNt

[:SOURce<ch>]:LIST:COUNt INFinite|<integer>
[:SOURce<ch>]:LIST:COUNt?

This command sets the number of list repetitions being played after triggering a list sweep. If set to INFinite, the list will be repeated until a [:SOURce<ch>]:FREQuency:MODE, [:SOURce<ch>]:PHASe:MODE or [:SOURce<ch>]:POWer:MODE command is issued.

*RST INFinite

Range INFinite or 2-65535

LIST:DIRection

[:SOURce<ch>]:LIST:DIRection UP|DOWN|RANDom

This command sets the direction of a list or step sweep.

*RST UP

LIST:DWELl

[:SOURce<ch>]:LIST:DWELl <float>,<float>
[:SOURce<ch>]:LIST:DWELl?

This command sets the dwell (on) time for the current list sweep RAM points. The dwell time is the amount of time the sweep is guaranteed to pause after setting the frequency and/or power for the current point.

If the programmed list contains one point, this setting is used for all points in the list sweep.

If a continuous (one point) value is given, that one value is used for all points. If a number of values are given, each value applies to the individual programmed point setting.

*RST 0 to 20 s

LIST:DELay:POINts

[:SOURce<ch>]:LIST:DELay:POINts?

This query returns the number of dwell time points in the current list sweep RAM.

LIST:DELay

[:SOURce<ch>]:LIST:DELay <float>,<float>
[:SOURce<ch>]:LIST:DELay?

This command sets the delay (with-hold off) time for the current list sweep RAM points. The off time is selected such that the transients between sweep points are blanked and do not appear at the RF output. The automatically selected off time varies with device size. It can be queried by [:SOURce<ch>]:LIST:DELay:AUTO while automatic mode is enabled.

*RST OFF

Range 8 ms, 16 ms, 32 ms, 64 ms

LIST:DELay:POINts

[:SOURce<ch>]:LIST:DELay:POINts?

This query returns the number of delay time points in the current list sweep RAM.

LIST:DELay:AUTO

[:SOURce<ch>]:LIST:DELay:AUTO ON|OFF|1|0
[:SOURce<ch>]:LIST:DELay:AUTO?

This command enables or disables automatic off (delay) time selection. In automatic mode, delay time is selected such that the transients between sweep points are blanked and do not appear at the RF output. The automatically selected off time varies with device type. It can be queried by [:SOURce<ch>]:LIST:DELay? while automatic mode is enabled.

*RST OFF

LIST:FREQuency

[:SOURce<ch>]:LIST:FREQuency <float>,<float>
[:SOURce<ch>]:LIST:FREQuency?

This command sets the frequency values for the current list sweep points.

If the programmed list contains one value, this setting is used for all points in the list sweep RAM. If multiple values are given, each value applies to the individual programmed setting.

The frequency list can only be modified while the unit is in CW mode, see [:SOURce]:FREQuency:MODE command. While a (list) sweep is active this command is ignored and a settings conflict error is reported to the :SYSTem:ERRor system.

*RST 10 MHz, 20 MHz, 30 MHz, 40 MHz

Range Please refer to the Data Sheet.

Unit Hz

LIST:MANual

[:SOURce<ch>]:LIST:MANual <integer>|UP|DOWN
[:SOURce<ch>]:LIST:MANual?

When enabled, continuously moves the sweep trigger system after completion of a triggered sweep.

This query returns the number of frequency points in the current list sweep RAM.

LIST:MODE

[:SOURce<ch>]:LIST:MODE AUTO|MANual
[:SOURce<ch>]:LIST:MODE?

This command sets the operating mode for the current list or step sweep.

*RST AUTO

LIST:PHASe

[:SOURce<ch>]:LIST:PHASe <float>,<float>
[:SOURce<ch>]:LIST:PHASe?

This command sets the phase values for the current list sweep points.

If the programmed list contains one value, this setting is used for all points in the list sweep. If multiple values are given, each value applies to the individual programmed setting.

The phase list can only be modified while the unit is in CW mode, see [:SOURce]:PHASe:MODE command. While a (list) sweep is active this command is ignored and a settings conflict error is reported to the :SYSTem:ERRor system.

*RST 0 dBm, 4 dBm, 2 dBm, 0 dBm

Range Please refer to the Data Sheet.

Unit dBm|...

LIST:PHASe:POINts

[:SOURce<ch>]:LIST:PHASe:POINts?

This command queries the number of power points in the current list sweep RAM.

LIST:POWer

[:SOURce<ch>]:LIST:POWer <float>,<float>
[:SOURce<ch>]:LIST:POWer?

This command sets the power values for the current list sweep points.

If the programmed list contains one point, this setting is used for all points in the list sweep RAM. If multiple points are given, each point applies to the individual programmed setting.

The amplitude list can only be modified while the unit is in CW mode, see [:SOURce]:POWer:MODE command. While a (list) sweep is active this command is ignored and a settings conflict error is reported to the :SYSTem:ERRor system.

*RST 0 dBm, 4 dBm, 2 dBm, 0 dBm

Range Please refer to the Data Sheet.

Unit dBm|...

LIST:POWer:POINts

[:SOURce<ch>]:LIST:POWer:POINts?

This command queries the number of power points in the current list sweep RAM.

LIST:PROGress

[:SOURce<ch>]:LIST:PROGress?

This query returns the progress of an active list sweep, 0.0...1.0.

LIST:BLANking

[:SOURce<ch>]:LIST:BLANking ON|OFF|1|0
[:SOURce<ch>]:LIST:BLANking?

This command enables or disables RF output blanking while waiting for the trigger signal. Blanking enabled means the RF output is off while waiting for the trigger event.

*RST ON

:MEMory<ch>:FILE:LIST

:MEMory<ch>:FILE:LIST? FIRSt|LAST|NEXT|PREVious

This query returns the file names of the available list files.

This allows enumerating all available list files.

:MEMory<ch>:FILE:LIST:DATA

:MEMory<ch>:FILE:LIST:DATA {"filename">},<data>
:MEMory<ch>:FILE:LIST:DATA? {"filename">}

The command writes data to a list file. If the file name is omitted, data will be loaded to the list RAM. The RAM list will be played when enabling the list mode.

The query returns list file data. If the file name is omitted, list RAM data will be returned.

Data sent or received has IEEE488.2 definite block data format.

#<num_digits><byte_count><data byte(s)<data_byte)

<num_digits> specifies how many digits are contained in <byte_count>

<byte_count> specifies how many data bytes follow in <data_bytes>.

Example of definite block data:

#21130000000;1.0;1.0;1

#21... byte count is two digits wide

#214... 14 data bytes will follow

...row. Each row defines one point of the list.

Example of a two points list (first point 100 MHz, 1.1 dBm, 100 ns on, 100 ns off; second point 130 MHz, 1.8 dBm, 100 ns off):

130000000;1.1;0.1;0.1\n

140000000;1.0;1.0;1\n

:MEMory<ch>:FILE:LIST:DELete

:MEMory<ch>:FILE:LIST:DELete "<filename>"|ALL

This command deletes the specified list file. Passing ALL deletes all present list files.

:MEMory<ch>:FILE:LIST:LOAD

:MEMory<ch>:FILE:LIST:LOAD "<filename>"

This command loads a list file to the list RAM. The RAM list will be played when enabling the list mode.

:MEMory<ch>:FILE:LIST:STORe

:MEMory<ch>:FILE:LIST:STORe "<filename>"

This command stores the current list RAM data in a list file.

[:SOURce]:LFOutput Subsystem

This command subsystem controls the low frequency output.

This is not supported by Model 875.

The low frequency output is global (common to all channels), so no channel selection is available. Commands with channel selection will be accepted, but the channel selection will be ignored.

LFOutput:AMPLitude

[:SOURce]:LFOutput:AMPLitude <float>
[:SOURce]:LFOutput:AMPLitude?

This command sets the low frequency generator output amplitude. This setting does only take effect if [:SOURce]:LFOutput:SOURce is set to LFGenerator and LFOutput:SHAPe is either set to SINE or TRIangle. Using any other setting, the output amplitude is fixed 2.5 V.

*RST 1 V

Range 0 to 2.5 V

Unit V

LFOutput:FREQuency

[:SOURce]:LFOutput:FREQuency <float>
[:SOURce]:LFOutput:FREQuency?

This command sets the low frequency generator frequency. This setting does only take effect if LFOutput:SOURce is set to LFGenerator.

*RST 400 Hz

Range 10 Hz to 5 MHz

Unit Hz

LFOutput:STATe

[:SOURce]:LFOutput:STATe ON|OFF|1|0
[:SOURce]:LFOutput:STATe?

This command sets the function output / low frequency generator state.

*RST OFF

LFOutput:SHAPe

[:SOURce]:LFOutput:SHAPe SINE|TRIangle|SQUare
[:SOURce]:LFOutput:SHAPe?

This command sets the low frequency generator waveform. This setting does only take effect if :LFOutput:SOURce is set to LFGenerator.

*RST SINE

LFOutput:SOURce

[:SOURce]:LFOutput:SOURce LFGenerator|PULM|TRIGger
[:SOURce]:LFOutput:SOURce?

This command sets the low frequency generator waveform. This setting does only take effect if :LFOutput:SOURce is set to LFGenerator.

*RST LFGenerator

[:SOURce<ch>]:MT Subsystem

This command subsystem controls the multi function inputs and outputs.

MT<index>:OUTPut:STATe

[:SOURce<ch>]:MT<index>:OUTPut:STATe ON|OFF|1|0
[:SOURce<ch>]:MT<index>:OUTPut:STATe?

This command enables or enables a multi function output.

The <index> suffix selects an individual output. The range is 1 to [:SOURce<ch>]:MT:COUNt. If <index> is omitted it defaults to 1.

*RST OFF

MT<index>:OUTPut:SOURce

[:SOURce<ch>]:MT<index>:OUTPut:SOURce LOW|HIGH|PULModulation|ARBitrary
[:SOURce<ch>]:MT<index>:OUTPut:SOURce?

This command sets the source signal of a multi function output.

The <index> suffix selects an individual output. The range is 1 to [:SOURce<ch>]:MT:COUNt. If <index> is omitted it defaults to 1.

*RST LOW

MT<index>:OUTPut:ARBitrary:SOURce

[:SOURce<ch>]:MT<index>:OUTPut:ARBitrary:SOURce MARKer|TRIGger
[:SOURce<ch>]:MT<index>:OUTPut:ARBitrary:SOURce?

This command selects the source from the arbitrary modulation system that is selected as the source multi function output.

The <index> suffix selects an individual output. The range is 1 to [:SOURce<ch>]:MT:COUNt. If <index> is omitted it defaults to 1.

*RST MARKer

MT<index>:OUTPut:MARKer:SOURce

[:SOURce<ch>]:MT<index>:OUTPut:MARKer:SOURce <integer>
[:SOURce<ch>]:MT<index>:OUTPut:MARKer:SOURce?

This command selects the marker bit from the marker system that is assigned to the multi function output.

The <index> suffix selects an individual output. The range is 1 to [:SOURce<ch>]:MT:COUNt. If <index> is omitted it defaults to 1.

*RST 1

MT<index>:OUTPut:PULModulation:SOURce

[:SOURce<ch>]:MT<index>:OUTPut:PULModulation:SOURce VIDeo|TRIGger
[:SOURce<ch>]:MT<index>:OUTPut:PULModulation:SOURce?

This command selects the source from the pulse modulation system that is assigned to the multi function output.

*RST VIDeo

MT<index>:OUTPut:SWEep:SOURce

[:SOURce<ch>]:MT<index>:OUTPut:SOURce VALid|TRIGger
[:SOURce<ch>]:MT<index>:OUTPut:SOURce?

This command selects the source from the sweep system that is assigned to the multi function output.

The <index> suffix selects an individual output. The range is 1 to [:SOURce<ch>]:MT:COUNt. If <index> is omitted it defaults to 1.

*RST VALid

MT<index>:INPut:STATe

[:SOURce<ch>]:MT<index>:INPut:STATe?

This query returns the actual digital value of the multi function input.

The <index> suffix selects an individual input. The range is 1 to [:SOURce<ch>]:MT:COUNt. If <index> is omitted it defaults to 1.

MT<index>:COUNt?

[:SOURce<ch>]:MT<index>:COUNt?

The command returns the number of multi function outputs of the device.

[:SOURce<ch>]:SWEep Subsystem

SWEep:COUNt

[:SOURce<ch>]:SWEep:COUNt INFinite|<integer>
[:SOURce<ch>]:SWEep:COUNt?

This command sets the number of sweep repetitions being played after triggering a sweep. If set to INFinite, the sweep will be repeated until a [:SOURce<ch>]:FREQuency:MODE, [:SOURce<ch>]:PHASe:MODE or [:SOURce<ch>]:POWer:MODE command is issued.

*RST INFinite

Range INFinite or 2 to 65535

SWEep:DIRection

[:SOURce<ch>]:SWEep:DIRection UP|DOWN|RANDom
[:SOURce<ch>]:SWEep:DIRection?

This command sets the direction of a step sweep.

*RST UP

SWEep:POINts

[:SOURce<ch>]:SWEep:POINts <integer>
[:SOURce<ch>]:SWEep:POINts?

This command defines the number of step sweep points.

*RST 2

Range 2 to 65535

SWEep:DWELl

[:SOURce<ch>]:SWEep:DWELl <float>
[:SOURce<ch>]:SWEep:DWELl?

This command sets the dwell time for the step sweep points. The dwell time is the on time. This is the amount of time the sweep plays the current point with RF on.

The total amount of time spent per point equates to dwell time + delay time.

*RST 400 us

Range 0 to 20 s

Unit s

SWEep:DELay

[:SOURce<ch>]:SWEep:DELay <float>
[:SOURce<ch>]:SWEep:DELay?

This command sets the delay time per sweep point. The delay time is the off time. This is the amount of time the sweep plays the current point with RF off.

*RST 0 s

Range 0 to 20 s

Unit s

SWEep:DELay:AUTO

[:SOURce<ch>]:SWEep:DELay:AUTO ON|OFF|1|0
[:SOURce<ch>]:SWEep:DELay:AUTO?

This command enables or disables automatic off (delay) time selection. In automatic mode, delay time is selected such that the transients between sweep points do not appear at the RF output. The automatically selected off time varies with device type. It can be queried by [:SOURce<ch>]:SWEep:DELay? while automatic mode is enabled.

*RST OFF

SWEep:PROGress

[:SOURce<ch>]:SWEep:PROGress?

This query returns the progress of an active sweep. The returned value is in the range of 0.0 to 1.0, with 0.0 indicating sweep is at start and 1.0 indicating stop.

SWEep:SPACing

[:SOURce<ch>]:SWEep:SPACing LINear|LOGarithmic
[:SOURce<ch>]:SWEep:SPACing?

This command defines how the frequency sensor or logarithmic sweep modes.

Logarithmic step is supported for frequency sweeps only. Power and phase sweeps support linear mode only (linear or 0 for power sweeps) and ignore this setting.

*RST LINear

SWEep:BLANking

[:SOURce<ch>]:SWEep:BLANking ON|OFF|1|0
[:SOURce<ch>]:SWEep:BLANking?

This command enables or disables RF output blanking while waiting for the trigger signal. Blanking enabled means the RF output is off while waiting for the trigger event.

*RST ON

SWEep:TRIGger

[:SOURce<ch>]:SWEep:TRIGger [:SOURce] IMMediate|BUS|EXTernal

This command executes a specific sweep internal trigger event.

This command is available for Model 875 devices only.

SWEep:TRIGger:ABORt

[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:ABORt

This command executes a specific sweep internal trigger event.

The SWEep:STORe command, CORRection:FLATness:STORe command. The directory path is implied in the command and need not be specified in the "<file name>" variable.

SWEep:TRIGger:DELay

[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:DELay <float>
[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:DELay?

This command sets the amount of time to delay the response to the sweep trigger.

*RST 0

Unit s

SWEep:TRIGger:EXTernal:DELay

[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:EXTernal:DELay <float>
[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:EXTernal:DELay?

This command sets the amount of time to delay the response to the sweep trigger.

*RST 0

SWEep:TRIGger:EXTernal:SLOPe

[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:EXTernal:SLOPe POSitive|NEGative
[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:EXTernal:SLOPe?

This command sets the polarity for an external sweep trigger signal.

*RST POSitive

SWEep:TRIGger:EXTernal:SOURce

[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:EXTernal:SOURce MF1|MF2
[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:EXTernal:SOURce?

This command selects the multi function channel as external sweep trigger input.

*RST MF1

SWEep:TRIGger:OUTPut:DELay

[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:OUTPut:DELay <float>
[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:OUTPut:DELay?

This command sets the delay of the sweep trigger output signal.

*RST 0

Unit s

SWEep:TRIGger:OUTPut:MODE

[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:OUTPut:MODE NORMal|POINt|GATE
[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:OUTPut:MODE?

This command is available for Model 875 devices only.

*RST NORMal

SWEep:TRIGger:OUTPut:POLarity

[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:OUTPut:POLarity POSitive|NEGative|INVerted
[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:OUTPut:POLarity?

This command sets the sweep trigger output signal polarity.

*RST POSitive

SWEep:TRIGger:OUTPut:PWIDth

[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:OUTPut:PWIDth <float>
[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:OUTPut:PWIDth?

This command sets the pulse width of the sweep trigger output signal.

*RST 0

Unit s

SWEep:TRIGger:SOURce

[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:SOURce IMMediate | BUS | EXTernal | SYNChronous
[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:SOURce?

This command sets the sweep trigger source.

This command is available for Model 875 devices only.

*RST IMMediate

SWEep:TRIGger:TYPE

[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:TYPE NORMal|POINt|GATE
[:SOURce<ch>]:SWEep:TRIGger [:SOURce]:TYPE?

This command selects the waveform's response to a sweep trigger signal.

*RST NORMal

SWEep:FREQuency:CENTer

This related command sets the center frequency of a step sweep.

Refer to [:SOURce]:FREQuency:CENTer for a detailed command description.

SWEep:FREQuency:MODE

This related command sets the frequency mode of the signal generator. A frequency sweep can be enabled by selecting sweep mode or disabled by selecting any other mode. Refer to [:SOURce]:FREQuency:MODE for a detailed command description.

SWEep:FREQuency:SPAN

This related command sets the frequency span of a step sweep.

Refer to [:SOURce]:FREQuency:SPAN for a detailed command description.

SWEep:FREQuency:STARt

This related command sets the start frequency of a step sweep.

Refer to [:SOURce]:FREQuency:STARt for a detailed command description.

SWEep:FREQuency:STOP

This related command sets the stop frequency of a step sweep.

Refer to [:SOURce]:FREQuency:STOP for a detailed command description.

SWEep:PHASe:CENTer

This related command sets the center phase of a step sweep.

Refer to [:SOURce]:PHASe:CENTer for a detailed command description.

SWEep:PHASe:MODE

This related command sets the phase mode of the signal generator. A phase sweep can be enabled by selecting sweep mode or disabled by selecting any other mode. Refer to [:SOURce]:PHASe:MODE for a detailed command description.

SWEep:PHASe:SPAN

This related command sets the phase span of a step sweep.

Refer to [:SOURce]:PHASe:SPAN for a detailed command description.

SWEep:PHASe:STARt

This related command sets the start phase in a step sweep.

Refer to [:SOURce]:PHASe:STARt for a detailed command description.

SWEep:PHASe:STOP

This related command sets the stop phase in a step sweep.

Refer to [:SOURce]:PHASe:STOP for a detailed command description.

SWEep:POWer:CENTer

This related command sets the center amplitude of a step sweep.

Refer to [:SOURce]:POWer:CENTer for a detailed command description.

SWEep:POWer:MODE

This related command sets the power mode of the signal generator. A power sweep can be enabled by selecting sweep mode or disabled by selecting any other mode. Refer to [:SOURce]:POWer:MODE for a detailed command description.

SWEep:POWer:SPAN

This related command sets the power span of a step sweep.

Refer to [:SOURce]:POWer:SPAN for a detailed command description.

SWEep:POWer:STARt

This related command sets the start phase in a step sweep.

Refer to [:SOURce]:POWer:STARt for a detailed command description.

SWEep:POWer:STOP

This related command sets the stop phase in a step sweep.

Refer to [:SOURce]:POWer:STOP for a detailed command description.

[:SOURce<ch>]:AM Subsystem (Amplitude Modulation)

AM:DEPTh

[:SOURce<ch>]:AM[:DEPTh]: <float>
[:SOURce<ch>]:AM[:DEPTh]:?

This command sets the amplitude modulation depth. This setting will be used if [:SOURce<ch>]:AM:SOURce is set to INTernal.

*RST 0.8

Range 0 to 0.99

Unit 1|PCT

AM:INTernal:FREQuency

[:SOURce<ch>]:AM:INTernal:FREQuency <float>
[:SOURce<ch>]:AM:INTernal:FREQuency?

This command sets the internal amplitude modulation rate.

*RST 400 Hz

Range 10 Hz to 50 kHz

Unit Hz

AM:SENSitivity

[:SOURce<ch>]:AM:INTernal:SENSitivity <float>
[:SOURce<ch>]:AM:INTernal: SENSitivity?

This command sets the external amplitude modulation sensitivity. This setting will be used if [:SOURce<ch>]:AM:SOURce is set to EXTernal.

*RST 0.8 V^-1

Range 0 to 3 V^-1

Unit V^-1

AM:SOURce

[:SOURce<ch>]:AM:SOURce INTernal|EXTernal
[:SOURce<ch>]:AM: SOURce?

This command selects the amplitude modulation signal source.

*RST INTernal

AM:STATe

[:SOURce<ch>]:AM:STATe 0|1|OFF|ON
[:SOURce<ch>]:AM: STATe?

This command turns the amplitude modulation on or off.

*RST OFF

[:SOURce<ch>]:FM Subsystem (Frequency Modulation)

FM:DEViation

[:SOURce<ch>]:FM:DEViation <float>
[:SOURce<ch>]:FM: DEViation?

This command sets the frequency modulation deviation. This setting will be used if [:SOURce<ch>]:FM:SOURce is set to INTernal.

*RST 1000 Hz

Range Please refer to the Data Sheet.

Unit Hz

FM:SENSitivity

[:SOURce<ch>]:FM:SENSitivity <float>
[:SOURce<ch>]:FM: SENSitivity?

This command sets the frequency modulation deviation per one volt peak amplitude signal input. This setting will be used if [:SOURce<ch>]:FM:SOURce is set to EXTernal.

*RST 1000 Hz/V

Range Please refer to the Data Sheet.

Unit Hz/V

FM:INT:FREQuency

[:SOURce<ch>]:FM:INT:FREQuency <float>
[:SOURce<ch>]:FM:INT:FREQuency?

This command sets the frequency modulation rate in Hz. This setting will be used if [:SOURce<ch>]:FM:SOURce is set to INTernal.

*RST 400 Hz

Range Please refer to the Data Sheet.

Unit Hz

FM:INT:SHAPe

[:SOURce]:FM:INT:SHAPe RD|RU|SINE|SQUare|TRIangle
[:SOURce]:FM:INT:SHAPe?

This command specifies the FM modulation shape.

*RST SINE

FM:SOURce

[:SOURce<ch>]:FM:SOURce EXTernal|INTernal
[:SOURce<ch>]:FM:SOURce?

This command selects the FM modulation signal source.

*RST EXTernal

FM:STATe

[:SOURce<ch>]:FM:STATe ON|OFF|1|0
[:SOURce<ch>]:FM:STATe?

This command turns the frequency modulation on or off.

*RST OFF

FM:COUPling

[:SOURce<ch>]:FM:COUPling AC|DC
[:SOURce<ch>]:FM:COUPling?

This command selects AC or DC signal coupling for the external FM modulation.

*RST AC

[:SOURce<ch>]:PM Subsystem (Phase Modulation)

PM:DEViation

[ :SOURce<ch>]:PM:DEViation<float>
[ :SOURce<ch>]:PM:DEViation?

This command sets the phase modulation deviation. This setting will be used if [:SOURce<ch>]:PM:SOURce is set to INTernal.

*RST 2.4048 rad

Range Please refer to the Data Sheet.

Unit rad

PM:SENSitivity

[:SOURce<ch>]:PM:SENSitivity <float>
[:SOURce<ch>]:PM: SENSitivity?

This command sets the phase modulation deviation per one volt peak amplitude signal input. This setting will be used if [:SOURce<ch>]:PM:SOURce is set to EXTernal.

*RST 2.4048 rad/V

Range Please refer to the Data Sheet.

Unit rad/V

PM:INTernal:FREQuency

[:SOURce<ch>]:PM:INTernal:FREQuency <float>
[:SOURce<ch>]:PM:INTernal:FREQuency?

This command sets the phase modulation rate in Hz. This setting will be used if [:SOURce<ch>]:PM:SOURce is set to INTernal.

*RST 400 Hz

Range Please refer to the Data Sheet.

Unit Hz

PM:INT:SHAPe

[:SOURce<ch>]:PM:INT:SHAPe RD|RU|SINE|SQUare|TRIangle
[:SOURce<ch>]:PM:INT:SHAPe?

This command specifies the PM modulation shape.

*RST SINE

PM:SOURce

[:SOURce<ch>]:PM:SOURce EXTernal|INTernal
[:SOURce<ch>]:PM:SOURce?

This command selects the PM modulation signal source.

*RST EXTernal

PM:STATe

[:SOURce<ch>]:PM:STATe ON|OFF|1|0
[:SOURce<ch>]:PM:STATe?

This command turns the phase modulation on or off.

*RST OFF

[:SOURce<ch>]:PULM Subsystem (Pulse Modulation)

This additional functionality provides pulse modulation of the RF output signal delivered to the load by an internal or external modulation signal. The PERnal selection accesses the internally generated modulation input while EXTernal selects the external pulse (rear panel connector) input.

PULM:POLarity

[:SOURce<ch>]:PULM:POLarity NORMal|INVerted
[:SOURce<ch>]:PULM:POLarity?

This command selects the polarity of the pulse modulation, regardless if the internal or external modulation source is used.

*RST NORMal

PULM:INTernal:FREQuency

[:SOURce<ch>]:PULM:INTernal:FREQuency <float>
[:SOURce<ch>]:PULM:INTernal:FREQuency?

This command sets the pulse rate for the internally generated square wave.

*RST 10 Hz

Range 0.1 Hz to 33 MHz

Unit Hz

PULM:INTernal:PERiod

[:SOURce<ch>]:PULM:INTernal:PERiod <float>
[:SOURce<ch>]:PULM:INTernal:PERiod?

This command sets the pulse period for the internally generated pulse modulation.

If the entered value for the pulse period is equal to or less than the value for the pulse width, the pulse width changes to a value that is less than the pulse period.

*RST 100 ms

Range 30 ns to 10 s

Unit s

PULM:INTernal:PWIDth

[:SOURce<ch>]:PULM:INTernal:PWIDth <float>
[:SOURce<ch>]:PULM:INTernal:PWIDth?

This command sets the pulse width for the internally generated pulse signal.

If the entered value for the pulse width is equal to or greater than the value for the pulse period, the pulse width changes to a value that is less than the pulse period.

*RST 1.25 ms

Range 30 ns to 10 s

Unit s

PULM:SOURce

[:SOURce<ch>]:PULM:SOURce INTernal|EXTernal|BITStream
[:SOURce<ch>]:PULM:SOURce?

This command selects the source of the pulse modulation signal.

*RST INTernal

PULM:STATe

[:SOURce<ch>]:PULM:STATe ON|OFF|1|0
[:SOURce<ch>]:PULM:STATe?

This command enables or disables pulse modulation for the selected path.

*RST OFF

PULM:MODE

[:SOURce<ch>]:PULM:MODE RATio|BANDwidth|BWIDth
[:SOURce<ch>]:PULM:MODE?

This command sets the pulse modulator mode. With RATio the modulator is configured for maximum on-off ratio but reduced modulation bandwidth (ratio priority). With BANDwidth (BWIDth) the modulator is configured for maximum modulation bandwidth but reduced on-off ratio (bandwidth priority).

*RST RATio

PULM:MODulator

[:SOURce<ch>]:PULM:MODulator RF|BB
[:SOURce<ch>]:PULM:MODulator?

This command sets the pulse modulator.

This setting is available for vector signal generator devices only.

*RST RF

PULM:OUTPut:VIDeo:SOURce

[:SOURce<ch>]:PULM:OUTPut:VIDeo:SOURce?

For multi channel devices this command selects the source channel for pulse modulation video output. Refer to [SOURce]:LFOutput:SOURce and [SOURce]:LFOutput:STATe commands for pulse modulation video mode of the low frequency output.

*RST 1

Range 1 to number of channels

PULM:BITStream

[:SOURce<ch>]:PULM:BITStream <hex data>
[:SOURce<ch>]:PULM:BITStream?

This command sets the pulse train pattern using the variable <hex data>, in hexadecimal representation. Maximum pattern length is 512 bytes / 1024 hexadecimal digits / 4096 bits.

*RST 5h

Range 0 to 4096 bits

PULM:BITStream:BITS

[:SOURce<ch>]:PULM:BITS <integer>
[:SOURce<ch>]:PULM:BITS?

This command sets the number of pattern bits played.

*RST 4

Range 0 to programmed pattern length in bits

PULM:BITStream:DIRection

[:SOURce<ch>]:PULM:DIRection MSBFirst|LSBFirst
[:SOURce<ch>]:PULM:DIRection?

This command sets the pattern playback direction.

• MSBFirst. Selects most significant bit first.
• LSBFirst. Selects reverse direction, least significant bit first.

*RST MSBFirst

PULM:BITStream:RATE

[:SOURce<ch>]:PULM:RATE <float>
[:SOURce<ch>]:PULM:RATE?

This command sets the pattern playback bit rate.

*RST 20 Hz

Range 2 Hz to 33 MHz

Unit Hz

PULM:BITStream:STARbit

[:SOURce<ch>]:PULM:STARbit <integer>
[:SOURce<ch>]:PULM:STARbit?

This command sets the index of the first pattern bit played.

*RST 4

Range 0 to programmed pattern length in bits

PULM:BITStream:TIME

[:SOURce<ch>]:PULM:TIME <float>
[:SOURce<ch>]:PULM:TIME?

This command sets the pattern playback bit period.

*RST 50 ms

Range 30 ns to 500 ms

Unit s

[:SOURce<ch>]:ILS Subsystem

This subsystem provides ILS glideslope and localizer signal generation. It is only available to devices featuring the avionics modulations extension (AVIO).

ILS:GS[:STATe]

[:SOURce<ch>]:ILS:GS[:STATe] ON|OFF|1|0
[:SOURce<ch>]:ILS:GS[:STATe]?

This command enables or disables the ILS glide slope modulation.

*RST OFF

ILS:GS:AM0[:DEPTh]

[:SOURce<ch>]:ILS:GS:AM0[:DEPTh] <float>
[:SOURce<ch>]:ILS:GS:AM0[:DEPTh]?

This command sets the 90 Hz (upper beam) glide slope amplitude modulation depth.

*RST 0.4

Range 0.2 to 0.6

Unit 1|PCT

ILS:GS:AM0:STATe

[:SOURce<ch>]:ILS:GS:AM0:STATe ON|OFF|1|0
[:SOURce<ch>]:ILS:GS:AM0:STATe?

This command sets the state of the 90 Hz (upper beam) ILS glide slope modulation signal.

*RST ON

ILS:GS:AM1[:DEPTh]

[:SOURce<ch>]:ILS:GS:AM1[:DEPTh] <float>
[:SOURce<ch>]:ILS:GS:AM1[:DEPTh]?

This command sets the 150 Hz (lower beam) glide slope amplitude modulation depth.

*RST 0.4

Range 0.2 to 0.6

Unit 1|PCT

ILS:GS:AM1:STATe

[:SOURce<ch>]:ILS:GS:AM1:STATe ON|OFF|1|0
[:SOURce<ch>]:ILS:GS:AM1:STATe?

This command sets the state of the 150 Hz (lower beam) ILS glide slope modulation signal.

*RST ON

ILS:GS:DDM

[:SOURce<ch>]:ILS:GS:DDM <float>
[:SOURce<ch>]:ILS:GS:DDM?

This command sets the difference in modulation depth between the AM0 (90 Hz upper beam) and the AM1 (150 Hz lower beam) modulation signals.
The DDM setting is in amperes (A) receiver electric current equivalent. The available range goes beyond the standard full scale deflection of -150 to + 150 µA.

*RST 0 A

Range -686 to +686 µA

Unit A

ILS:GS:SDM

[:SOURce<ch>]:ILS:GS:SDM <float>
[:SOURce<ch>]:ILS:GS:SDM?

This command sets the sum of modulation depths of the AM0 (90 Hz upper beam) and the AM1 (150 Hz lower beam) modulation signals.

*RST 0 A

Range -686 to +686 µA

Unit A

ILS:GS:TEST

[:SOURce<ch>]:ILS:GS:TEST DDM0|UP|DOWN|FLAG

This command selects a predefined ILS glide slope test setting. It overrides all ILS glideslope settings except state.

*RST DDM0

ILS:GS:IDEN

[:SOURce<ch>]:GS:IDEN <"string">
[:SOURce<ch>]:GS:IDEN?

This command sets the morse coded four characters long ILS glideslope identification string. The string has SCPI string format (surrounded by quotation marks).

*RST "ANAP"

ILS:GS:IDEN:MODE

[:SOURce<ch>]:ILS:GS:IDEN:MODE PERiodic|CONTinuous
[:SOURce<ch>]:ILS:GS:IDEN:MODE?

This command selects the ILS glideslope identification transmission repetition mode.

• PERiodic. The identification is transmitted periodically every 20 seconds.
• CONTinuous. The identification is transmitted continuously with a 7 morse dots pause between transmissions.

*RST PERiodic

ILS:GS:IDEN:STATe

[:SOURce<ch>]:ILS:GS:IDEN:STATe ON|OFF|1|0
[:SOURce<ch>]:ILS:GS:IDEN:STATe?

This command enables or disables transmission of the morse coded ILS glideslope identification string.

*RST OFF

ILS: LOCalizer [:STATe]

[:SOURce<ch>]:ILS:LOC[:STATe] ON|OFF|1|0
[:SOURce<ch>]:ILS:LOC[:STATe]?

This command enables or disables the ILS localizer modulation.

*RST OFF

ILS:LOCalizer:AM0[:DEPTh]

[:SOURce<ch>]:ILS:LOCalizer:AM0[:DEPTh] <value>
[:SOURce<ch>]:ILS:LOCalizer:AM0[:DEPTh]?

This command sets the 90 Hz (left beam) localizer amplitude modulation depth.

*RST 0.2

Range 0.1 to 0.3

Unit 1|PCT

ILS:LOCalizer:AM0:STATe

[:SOURce<ch>]:ILS:LOCalizer:AM0:STATe ON|OFF|1|0
[:SOURce<ch>]:ILS:LOCalizer:AM0:STATe?

This command sets the state of the 90 Hz (left beam) ILS localizer modulation signal.

*RST OFF

ILS:LOCalizer:AM1[:DEPTh]

[:SOURce<ch>]:ILS:LOCalizer:AM1[:DEPTh] <value>
[:SOURce<ch>]:ILS:LOCalizer:AM1[:DEPTh]?

This command sets the 150 Hz (right beam) localizer amplitude modulation depth.

*RST 0.2

Range 0.1 to 0.3

Unit 1|PCT

ILS:LOCalizer:AM1:STATe

[:SOURce<ch>]:ILS:LOCalizer:AM1:STATe ON|OFF|1|0
[:SOURce<ch>]:ILS:LOCalizer:AM1:STATe?

This command sets the state of the 150 Hz (right beam) ILS localizer modulation signal.

*RST OFF

ILS:LOCalizer:DDM

[:SOURce<ch>]:ILS:LOCalizer:DDM <float>
[:SOURce<ch>]:ILS:LOCalizer:DDM?

This command sets the difference in modulation depth between the AM0 (90 Hz left beam) and the AM1 (150 Hz right beam) modulation signals.
The DDM setting is in amperes (A) receiver electric current equivalent. The available range goes beyond the standard full scale deflection of -150 to + 150 µA.

*RST 0 A

Range -387 to +387 µA

Unit A

ILS:LOCalizer:SDM

[:SOURce<ch>]:ILS:LOCalizer:SDM
[:SOURce<ch>]:ILS:LOCalizer:SDM?

This command sets the sum of modulation depths of the AM0 (90 Hz left beam) and the AM1 (150 Hz right beam) modulation signals.

*RST 0.4

Range 0.2 to 0.6

Unit 1|PCT

ILS: LOCalizer:TEST

[:SOURce<ch>]:ILS:LOC:TEST DDM0|LEFT|RIGHT|FLAG

This command selects a predefined ILS localizer test setting. It overrides all ILS localizer settings except state.

*RST DDM0

ILS:LOCalizer:IDEN

[:SOURce<ch>]:ILS:LOCalizer:IDEN <"string">
[:SOURce<ch>]:ILS:LOCalizer:IDEN?

This command sets the morse coded four characters long ILS localizer identification string. The string has SCPI string format (surrounded by quotation marks).

*RST "ANAP"

ILS:LOCalizer:IDEN:MODE

[:SOURce<ch>]:ILS:LOCalizer:IDEN:MODE PERiodic|CONTinuous
[:SOURce<ch>]:ILS:LOCalizer:IDEN:MODE?

This command selects the ILS localizer identification transmission repetition mode.

• PERiodic. The identification is transmitted periodically every 20 seconds.
• CONTinuous. The identification is transmitted continuously with a 7 morse dots pause between transmissions.

*RST PERiodic

ILS:LOCalizer:IDEN:STATe

[:SOURce<ch>]:ILS:LOCalizer:IDEN:MODE ON|OFF|1|0
[:SOURce<ch>]:ILS:LOCalizer:IDEN:MODE?

This command enables or disables transmission of the morse coded ILS localizer identification string.

*RST OFF

[:SOURce<ch>]:VOR Subsystem

This subsystem provides VOR signal generation. It is only available to devices featuring the avionics modulations extension (AVIO).

VOR[:STATe]

[:SOURce<ch>]:VOR[:STATe] ON|OFF|1|0
[:SOURce<ch>]:VOR[:STATe]?

This command enables or disables the VOR modulation.

*RST OFF

VOR:AM0[:DEPTh]

[:SOURce<ch>]:VOR:AM0[:DEPTh] <float>
[:SOURce<ch>]:VOR:AM0[:DEPTh]?

This command sets the 30 Hz VOR amplitude modulation depth.

*RST 0.3

Range 0.2 to 0.4

Unit 1|PCT

VOR:AM1[:DEPTh]

[:SOURce<ch>]:VOR:AM1[:DEPTh] <float>
[:SOURce<ch>]:VOR:AM1[:DEPTh]?

This command sets the 9960 Hz VOR subcarrier amplitude modulation depth.

*RST 0.3

Range 0.2 to 0.4

Unit 1|PCT

VOR:BEARing

[:SOURce<ch>]:VOR:BEARing <float>
[:SOURce<ch>]:VOR:BEARing?

This command sets the VOR bearing in radians. Append DEG to set the bearing in degrees.

*RST 0 rad

Range 0 to 6.28 rad

Unit rad|deg

VOR:FM:INDex

[:SOURce<ch>]:VOR:FM:INDex <float>
[:SOURce<ch>]:VOR:FM:INDex?

This command sets the 30 Hz frequency modulation index on the 9960 Hz AM subcarrier.

*RST 16

Range 15 to 17

VOR:TEST

[:SOURce<ch>]:VOR:TEST NORTh|SOUTh|EAST|WEST|1|2

This command selects a predefined VOR test setting. It overrides all VOR settings except state.

*RST NORTh

[:SOURce<ch>]:DME Subsystem

This subsystem provides DME signal generation. It is only available to devices featuring the avionics modulations extension (AVIO).

DME:STATe

[:SOURce<ch>]:DME:STATe ON|OFF|1|0
[:SOURce<ch>]:DME:STATe?

This command enables or disables the DME modulation.

*RST OFF

DME:FILTer

[:SOURce<ch>]:DME:FILTer LINear|GAUSs|RCOS|COS|COS2
[:SOURce<ch>]:DME:FILTer?

This command selects the pulse shaping filter applied to the main DME pulse pair.

• LINear. No filtering (trapezoidal pulse shape).
• GAUSs. Gaussian pulse shape filtering.
• RCOS. Root raised cosine pulse shape filtering.
• COS. Raised cosine pulse shape filtering.
• COS2. The pulse consists of a cosine during the rise time and a squared cosine during the fall time. Also known as COS/COS2.

*RST LINear

DME:FREQuency

[:SOURce<ch>]:DME:FREQuency <float>
[:SOURce<ch>]:DME:FREQuency?

This command sets the repetition rate of the DME pulse pattern.

*RST 1 kHz

Range 100 Hz to 5 kHz

Unit Hz

DME:PWIDth

[:SOURce<ch>]:DME:PWIDth <float>
[:SOURce<ch>]:DME:PWIDth?

This command sets the width of each pulse in the main pulse pair.

*RST 3.5 us

Range 100 ns to 100 us

Unit s

DME:PRISe

[:SOURce<ch>]:DME:PRISe <float>
[:SOURce<ch>]:DME:PRISe?

This command sets the rise time of each pulse in the main pulse pair.

*RST 2 us

Range 100 ns to 100 us

Unit s

DME:PFALl

[:SOURce<ch>]:DME:PFALl <float>
[:SOURce<ch>]:DME:PFALl?

This command sets the fall time of each pulse in the main pulse pair.

*RST 2 us

Range 100 ns to 100 us

Unit s

DME:PSPacing

[:SOURce<ch>]:DME:PSPacing <float>
[:SOURce<ch>]:DME:PSPacing?

This command sets the spacing between the two pulses of the main pulse pair. Spacing is defined as the time between the centers of the two pulses.

*RST 12 us

Range 100 ns to 100 us

Unit s

DME:APULse:PSELect

[:SOURce<ch>]:DME:APULse:PSELect <integer>
[:SOURce<ch>]:DME:APULse:PSELect?

Up to four additional pulses or pulse pairs can be added to the main pulse pair.
This command selects one of those additional pulses or pulse pairs for configuration with [:SOURce<ch>]:DME:APULse:<...> commands.
The first pulse is selected with index 0.

*RST 0

Range 0 to 3

DME:APULse:STATe

[:SOURce<ch>]:DME:APULse:STATe ON|OFF|1|0
[:SOURce<ch>]:DME:APULse:STATe?

This command enables or disables an additional pulse or pulse pair.
The additional pulse or pulse pair configured with this command can be selected with the [:SOURce<ch>]:DME:APULse:PSELect command.

*RST OFF

DME:APULse:PTYPe

[:SOURce<ch>]:DME:APULse:PTYPe SINGle|DOUBle
[:SOURce<ch>]:DME:APULse:PTYPe?

This command selects the type of an additional pulse or pulse pair.

• SINGle. Plays an additional single pulse.
• DOUBle. Plays an additional pulse pair.

The additional pulse or pulse pair configured with this command can be selected with the [:SOURce<ch>]:DME:APULse:PSELect command.

*RST DOUBle

DME:APULse:ATTenuation

[:SOURce<ch>]:DME:APULse:ATTenuation <float>
[:SOURce<ch>]:DME:APULse:ATTenuation?

This command sets the attenuation of an additional pulse pair, relative to the main pulse pair.
The additional pulse or pulse pair configured with this command can be selected with the [:SOURce<ch>]:DME:APULse:PSELect command.

*RST 0

Range -80 to +80

DME:APULse:PWIDth

[:SOURce<ch>]:DME:APULse:PWIDth <float>
[:SOURce<ch>]:DME:APULse:PWIDth?

This command sets the width of each pulse of an additional pulse or pulse pair.
The additional pulse or pulse pair configured with this command can be selected with the [:SOURce<ch>]:DME:APULse:PSELect command.

*RST 12 us

Range 2.5 to 9.5 us

Unit s

DME:APULse:PRISe

[:SOURce<ch>]:DME:APULse:PRISe <float>
[:SOURce<ch>]:DME:APULse:PRISe?

This command sets the rise time of each pulse in an additional pulse or pulse pair.
The additional pulse or pulse pair configured with this command can be selected with the [:SOURce<ch>]:DME:APULse:PSELect command.

*RST 2 us

Range 100 ns to 3.6 us

Unit s

DME:APULse:PFALl

[:SOURce<ch>]:DME:APULse:PFALl <float>
[:SOURce<ch>]:DME:APULse:PFALl?

This command sets the fall time of each pulse in an additional pulse or pulse pair.
The additional pulse or pulse pair configured with this command can be selected with the [:SOURce<ch>]:DME:APULse:PSELect command.

*RST 2 us

Range 100 ns to 3.6 us

Unit s

DME:APULse:PSPacing

[:SOURce<ch>]:DME:APULse:PSPacing <float>
[:SOURce<ch>]:DME:APULse:PSPacing?

This command sets the spacing between the two pulses of an additional pulse pair. Spacing is defined as the time between the centers of the two pulses.
The additional pulse or pulse pair configured with this command can be selected with the [:SOURce<ch>]:DME:APULse:PSELect command.

*RST 12 us

Range 6 to 100 us

Unit s

DME:APULse:DELay

[:SOURce<ch>]:DME:APULse:DELay <float>
[:SOURce<ch>]:DME:APULse:DELay?

This command sets the delay of an additional pulse or pulse pair relative to the main pulse pair.
The additional pulse or pulse pair configured with this command can be selected with the [:SOURce<ch>]:DME:APULse:PSELect command.

*RST 50 us

Range 0 to 100 us

Unit s

DME:ECHO:STATe

[:SOURce<ch>]:DME:ECHO:STATe ON|OFF|1|0
[:SOURce<ch>]:DME:ECHO:STATe?

This command enables or disables the main pulse pair echo.
The echo is a copy of the main pulse pair with settable delay and attenuation.

*RST OFF

DME:ECHO:DELay

[:SOURce<ch>]:DME:ECHO:DELay <float>
[:SOURce<ch>]:DME:ECHO:DELay?

This command sets the main pulse pair echo delay.
The echo is a copy of the main pulse pair with settable delay and attenuation.

*RST 8 us

Range 2 to 8 us

Unit s

DME:ECHO:ATTenuation

[:SOURce<ch>]:DME:ECHO:ATTenuation <float>
[:SOURce<ch>]:DME:ECHO:ATTenuation?

This command sets the main pulse pair echo attenuation.
The echo is a copy of the main pulse pair with settable delay and attenuation.

*RST 0

Range -12 to +3

DME:INTerference:STATe

[:SOURce<ch>]:DME:INTerference:STATe ON|OFF|1|0
[:SOURce<ch>]:DME:INTerference:STATe?

This command enables or disables interference.
Interference is a copy of the first main pulse (a single pulse), sent before the main pulse pair. Attenuation and main pulse pair delay are settable.

*RST OFF

DME:INTerference:DELay

[:SOURce<ch>]:DME:INTerference:DELay <float>
[:SOURce<ch>]:DME:INTerference:DELay?

This command sets the delay between interference and main pulse pair.
Interference is a copy of the first main pulse (a single pulse), sent before the main pulse pair. Attenuation and main pulse pair delay are settable.

*RST 8 us

Range 1 to 8 us

Unit s

DME:INTerference:ATTenuation

[:SOURce<ch>]:DME:INTerference:ATTenuation <float>
[:SOURce<ch>]:DME:INTerference:ATTenuation?

This command sets the interference pulse attenuation relative to the main pulse pair.
Interference is a copy of the first main pulse (a single pulse), sent before the main pulse pair. Attenuation and main pulse pair delay are settable.

*RST 0

Range 0 to 30

DME:DEADtime:STATe

[:SOURce<ch>]:DME:DEADtime:STATe ON|OFF|1|0
[:SOURce<ch>]:DME:DEADtime:STATe?

This command enables or disables the receiver dead time test pulse pair.
The dead time pulse is a copy of the main pulse pair with settable delay.

*RST OFF

DME:DEADtime:DELay

[:SOURce<ch>]:DME:DEADtime:DELay <float>
[:SOURce<ch>]:DME:DEADtime:DELay?

This command sets the receiver dead time test pulse pair delay.
The dead time pulse is a copy of the main pulse pair with settable delay.

*RST 10 us

Range 10 to 100 us

Unit s

[:SOURce<ch>]:BB Subsystem

This subsystem configures the base band data path to the IQ modulator. This subsystem is available for Model 875 devices only.

BB:ARBitrary:MODE

[:SOURce<ch>]:BB:ARBitrary:MODE BLANk|CW|CIQ|NORMal|RETRace
[:SOURce<ch>]:BB:ARBitrary:MODE?

This command selects the source controlling the active segment.

BB:ARBitrary:CLOCk

[:SOURce<ch>]:BB:ARBitrary:CLOCk<float>
[:SOURce<ch>]:BB:ARBitrary:CLOCk?

This command sets the base band path sample clock. The modulation bandwidth is +/- 40 % of the sample clock, e.g. +/- 200 MHz at 500 MHz sample clock.

*RST 500 MHz

Range 1 Hz to 500 MHz

Unit Hz

BB:ARBitrary:FCPort[:STATe]

[:SOURce<ch>]:BB:ARBitrary:FCPort[:STATe] ON|OFF|1|0
[:SOURce<ch>]:BB:ARBitrary:FCPort:STATe?

This command enables or disables streaming IQ modulation data from the FCP to the IQ modulator. FCP must be configured for IQ streaming by the [:SOURce<ch>]:FCPort:STREam:IQ command.

*RST OFF

BB:ARBitrary:WAVeform:STATe

[:SOURce<ch>]:BB:ARBitrary:WAVeform:STATe ON|OFF|1|0
[:SOURce<ch>]:BB:ARBitrary:WAVeform:STATe?

This command enables or disables arbitrary waveform playback.

*RST OFF

BB:ARBitrary:WAVeform:CLOCk

[:SOURce<ch>]:BB:ARBitrary:WAVeform:CLOCk<float>
[:SOURce<ch>]:BB:ARBitrary:WAVeform:CLOCk?

This command sets the sample clock for the waveform modulation.

*RST 500 MHz

Range 1 Hz to 500 MHz

Unit Hz

BB:ARBitrary:WAVeform:DATA

[:SOURce<ch>]:BB:ARBitrary:WAVeform:DATA [<integer>]<data>

This command writes waveforms (IQ modulation data samples with optional marker bits) to the device for playback.

There are the following important limitations with firmware version < 0.4.178:

• the query is not supported,
• the number of samples must be at least 32 (128 bytes),
• the number of samples must be an integer multiple of 8 (32 bytes).

For Firmware >= 0.4.178 the minimum number of samples of a waveform is defined in the datasheet. Shorter waveforms will be automatically extended by cyclically repeating the waveform.

Writing waveforms does not overwrite waveforms existing on the device. Combined waveforms uploaded to a device can not exceed the maximum sample count supported by a device.
The remaining number of samples that may be written to the device can be queried using [:SOURce]:BB:ARBitrary:WAVeform:DATA:FREE?.
To clear the waveforms memory use the [:SOURce]:BB:ARBitrary:WAVeform:DATA:DELete ALL command.
Please refer to the Data Sheet for the maximum sample count.

Parameter 1, [<integer>]

This optional parameter specifies the segment index used for:

• programmable sequences of segmented waveforms or segment selection by command, see [:SOURce<ch>]:BB:ARBitrary:WSEGment commands,
• segment selection via FCP, see [:SOURce<ch>]:BB:ARBitrary:WSEGment and [:SOURce<ch>]:FCPort commands.

Range 0 to maximum number of segments minus 1 (refer to the Data Sheet), defaults to 0 if omitted

Parameter 2, <data>

Data sent or received has IEEE488.2 definite block data format:

#<num_digits><byte_count><data byte>{<data_byte}

<num_digits> specifies how many digits are contained in <byte_count>.

<byte_count> specifies how many data bytes follow in <data_bytes>.

Example of definite block data:

#18xxxxxxxx

• #18...: byte count is one digit wide
• #18...: 8 data bytes will follow
• ...xxxxxxxx: 8 bytes of data

The data itself consists of IQ data samples and optional marker bits. An IQ data sample is 32 bits wide (without marker bits) or 40 bits wide (with marker bits) and contains two 16 bits two's complement values (I and Q component) representing fixed point numbers from -1 to +1.Little-endian format is used: data at lower address (transmitted first) is least significant. This is the same format that is used by many PCs (x86, AMD64 and x86-64 architectures).
Before sending waveforms the device has to be configured to handle IQ data with or without marker bits with the command [:SOURce<ch>]:BB:ARBitrary:WAVeform:MARKer:STATe.
It is not possible to mix 32 bits wide data format with 40 bits wide data format.

Data format without marker bits:

On little-endian systems this format is equivalent to an array of the following C type:

struct {
      int16_t q;
      int16_t i;
} IQ_SAMPLE;

Data format with marker bits:

On little-endian systems this format is equivalent to an array of the following C type:

struct {
      int8_t marker;
      int16_t q;
      int16_t i;
} IQ_SAMPLE;

BB:ARBitrary:WAVeform:DATA:DELete

[:SOURce<ch>]:BB:ARBitrary:WAVeform:DATA:DELete ALL

• ALL. This command clears the waveform memory (deletes all waveforms stored on the device).

BB:ARBitrary:WAVeform:DATA:FREE

[:SOURce<ch>]:BB:ARBitrary:WAVeform:DATA:FREE?

This query returns the remaining number of samples that may be written to the device.

BB:ARBitrary:WAVeform:MARKer:STATe

[:SOURce<ch>]:BB:ARBitrary:WAVeform:MARKer:STATe ON|OFF|1|0
[:SOURce<ch>]:BB:ARBitrary:WAVeform:MARKer:STATe?

This command enables or disables marker bits. Marker bits can be used to wait for trigger events or to generate trigger signals (on the MF output ports).

When enabled, each IQ sample features additional marker bits that can be set individually.

Using markers increases the logical size of a sample and thus reduces the total number of samples that can be stored on the device. Please refer to the Data Sheet for the maximum sample count with or without marker bits enabled.

*RST OFF

BB:ARBitrary:WAVeform:MARKer:COUNt

[:SOURce<ch>]:BB:ARBitrary:WAVeform:MARKer:COUNt?

This query returns the number of individual marker bits available per sample.

BB:ARBitrary:WAVeform:MARKer<index>:POLarity

[:SOURce<ch>]:BB:ARBitrary:WAVeform:MARKer<index>:POLarity NORMal|INVerted
[:SOURce<ch>]:BB:ARBitrary:WAVeform:MARKer<index>:POLarity?

This command sets the polarity of individual marker bits.

The <index> suffix selects an individual marker bit. The range is 1 to [:SOURce<ch>]:BB:ARBitrary:WAVeform:MARKer:COUNt. If <index> is omitted it defaults to 1.

The parameter selects the polarity of the selected individual marker bit.

• NORMal. A logic high (1) marker bit results in a high level when connected to an MF output port.
• INVerted. A logic high (1) marker bit results in a low level when connected to an MF output port.

*RST NORMal

BB:ARBitrary:WAVeform:FILE:DELete

[:SOURce<ch>]:BB:ARBitrary:WAVeform:FILE:DELete <"string">

This command deletes the specified waveform file from non-volatile memory.

BB:ARBitrary:WAVeform:FILE:FREE

[:SOURce<ch>]:BB:ARBitrary:WAVeform:FILE:FREE?

This query returns the free space of the non-volatile memory in bytes.

BB:ARBitrary:WAVeform:FILE:LIST

[:SOURce<ch>]:BB:ARBitrary:WAVeform:FILE:LIST?

This query returns an unsorted list of stored waveform files.

BB:ARBitrary:WAVeform:STATe

[:SOURce<ch>]:BB:ARBitrary:WAVeform:STATe ON|OFF|1|0

This command enables arbitrary waveform modulation.

*RST OFF

BB:ARBitrary:WSEGment

[:SOURce<ch>]:BB:ARBitrary:WSEGment <integer>
[:SOURce<ch>]:BB:ARBitrary:WSEGment?

This command selects the active waveform segment when internal segment selection is enabled ([:SOURce<ch>]:BB:ARBitrary:WSEGment:SOURce INTernal).

*RST 0

Range 0 to maximum number of segments minus 1 (refer to the Data Sheet)

BB:ARBitrary:WSEGment:COUNt

[:SOURce<ch>]:BB:ARBitrary:WSEGment:COUNt? [MAX]

This query returns the number of segments currently stored on the device.

• MAX. Passing this optional parameter lets the query return the maximum number of segments supported by the device.

BB:ARBitrary:WSEGment:MODE

[:SOURce<ch>]:BB:ARBitrary:WSEGment:MODE SEAMless|IMMediate
[:SOURce<ch>]:BB:ARBitrary:WSEGment:MODE?

This command controls the transition between different segments.

• SEAMless. In seamless mode, the next active segment occurs is appended seamlessly after the last sample of the previously active segment. Every segment is played completely.
• IMMediate. The active segment is selected via FCP, see [:SOURce<ch>]:FCPort commands. (Reserved for future use)

*RST SEAMless

BB:ARBitrary:WSEGment:SOURce

[:SOURce<ch>]:BB:ARBitrary:WSEGment:SOURce INTernal|FCPort|SEQuence|MF
[:SOURce<ch>]:BB:ARBitrary:WSEGment:SOURce?

This command sets the source that controls the active segment selection.

• INTernal. The active segment is selected by the command [:SOURce<ch>]:BB:ARBitrary:WSEGment.
• FCPort. The active segment is selected via FCP, see [:SOURce<ch>]:FCPort commands.
• SEQuence. The active segment is selected according a predefined sequence.
• MF. The active segment is selected with the MF input ports, see BB:ARBitrary:WSEGment:MF<index>:INPut:WSEGment.

*RST INTernal

BB:ARBitrary:WSEGment:LOAD

[:SOURce<ch>]:BB:ARBitrary:WSEGment:LOAD <int> (num_digits) , <int> (byte_count) , <int> (databyte)
[:SOURce<ch>]:BB:ARBitrary:WSEGment:LOAD?

This command loads the sequencers script.

BB:ARBitrary:WSEGment:LOAD:ERRor?

[:SOURce<ch>]:BB:ARBitrary:WSEGment:LOAD:Error?

This query returns the sequencer script parser error.

BB:ARBitrary:WSEGment:RUN

[:SOURce<ch>]:BB:ARBitrary:WSEGment:RUN 0|1
[:SOURce<ch>]:BB:ARBitrary:WSEGment:RUN?

This command sets or query sequencer run state.

BB:ARBitrary:WSEGment:MF<index>:INPut:STATe

[:SOURce<ch>]:BB:ARBitrary:WSEGment:MF#:INPut:STATe ON|OFF|1|0
[:SOURce<ch>]:BB:ARBitrary:WSEGment:MF#:INPut:STATe?

This command enables the MF input for waveform segment selection.

*RST OFF

BB:ARBitrary:WSEGment:MF<index>:INPut:SLOPe

[:SOURce<ch>]:BB:ARBitrary:WSEGment:MF#:INPut:SLOPe POSitive|NEGative
[:SOURce<ch>]:BB:ARBitrary:WSEGment:MF#:INPut:SLOPe?

This command sets the detecting slope of the MF input signal for WSEG selection.

*RST POSitive

BB:ARBitrary:WSEGment:MF<index>:INPut:WSEGment

[:SOURce<ch>]:BB:ARBitrary:WSEGment:MF#:INPut:WSEGment <integer>
[:SOURce<ch>]:BB:ARBitrary:WSEGment:MF#:INPut:WSEGment?

This command sets the segment ID that is to be activated with a MF trigger event.

*RST 0

BB:ARBitrary:AIQ[:STATe]

[:SOURce<ch>]:BB:ARBitrary:AIQ[:STATe] ON|OFF|1|0
[:SOURce<ch>]:BB:ARBitrary:AIQ[:STATe]?

This command enables/disables the arbitrary baseband modulation, using the analog IQ modulation signals. The analog input ports have to be enabled with [:SOURce]:AIN[:STATe].

*RST OFF

BB:ARBitrary:AIQ:CLOCk?

[:SOURce<ch>]:BB:ARBitrary:AIQ:CLOCk?

This query returns the sampling rate for the AIQ modulation.

Unit Hz

BB:ARBitrary:AIQ:SOURce:I

[:SOURce<ch>]:BB:ARBitrary:AIQ:Source:I 1|2

This command sets the AIN channel source for the I (in-phase) part of the analog IQ modulation signal to either AIN1 or AIN2.

*RST 1

BB:ARBitrary:AIQ:SOURce:Q

[:SOURce<ch>]:BB:ARBitrary:AIQ:Source:Q 1|2

This command sets the AIN channel source for the Q (quadrature) part of the analog IQ modulation signal to either AIN1 or AIN2.

*RST 2

BB:ARBitrary:TRIG[:SEQuence][:IMMediate]

This command executes a specific arbitrary internal trigger event.

BB:ARBitrary:TRIG[:SEQuence]:ABORt

This command inhibits the trigger signal.

BB:ARBitrary:TRIG[:SEQuence]:DELay

[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:DELay <float>
[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:DELay?

This command sets the amount of time to delay the response to the trigger.

*RST 0s

Unit s

BB:ARBitrary:TRIG[:SEQuence]:EXTernal:DELay

[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:EXTernal:DELay <float>
[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:EXTernal:DELay?

This command sets the amount of time to delay the response to the external trigger.

Range 0 to 8 s

*RST 0 s

Unit s

BB:ARBitrary:TRIG[:SEQuence]:EXTernal:SLOPe

[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:EXTernal:SLOPe POSitive|NEGative
[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:EXTernal:SLOPe?

This command sets the polarity for an external trigger signal.

*RST POSitive

BB:ARBitrary:TRIG[:SEQuence]:EXTernal:SOURce

[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:EXTernal:SOURce MF1|MF2
[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:EXTernal:SOURce?

This command sets the arbitrary external trigger source.

*RST MF1

BB:ARBitrary:TRIG[:SEQuence]:INITiate[:IMMediate]

[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:INIT[:IMMediate]

Initiates the system: Trigger signals will be accepted by the arbitrary trigger system until it's triggered once.

BB:ARBitrary:TRIG[:SEQuence]:INITiate:CONTinuous

[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:INITiate:CONTinuous

This command Inhibits the arbitrary trigger signal.

BB:ARBitrary:TRIG[:SEQuence]:OUTPut:DELay

[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:OUTP:DELay <float>
[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:OUTP:DELay ?

This command sets the delay of arbitrary trigger output signal.

*RST 0 s

BB:ARBitrary:TRIG[:SEQuence]:OUTPut:POLarity

[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:OUTPut:POLarity NORMal|INVerted
[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:OUTPut:POLarity?

This command sets the arbitrary trigger output signal polarity.

*RST NORMal

BB:ARBitrary:TRIG[:SEQuence]:OUTPut:PWIDth

[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:OUTPut:PWIDth<float>
[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:OUTPut:PWIDth?

This command sets the pulse width of the arbitrary trigger output signal.

*RST 1 us

Range 0 to 16 us

Unit s

BB:ARBitrary:TRIG[:SEQuence]:SOURce

[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:SOURce
[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:SOURce?

This command set the arbitrary trigger source.

• IMMediate. no waiting for a trigger event occurs
• BUS. command BB:ARBitrary:TRIGger:[IMMediate]
• EXTernal. externally applied signal or command BB:ARBitrary:TRIGger:[IMMediate]
• SYNChronous. synchronized trigger over all channels.

*RST IMMediate

BB:ARBitrary:TRIG[:SEQuence]:TYPE

[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:TYPE NORMal|NSEG|NSEQ
[:SOURce<ch>]:BB:ARBitrary:TRIG[:SEQuence]:TYPE?

This command selects the waveform's response to a trigger signal.

• NORMal. 1st trigger = start waveform, subsequent trigger = ignored
• NSEGment. 1st trigger = start waveform, subsequent trigger = load next segment (if available)
• NSEQuence. 1st trigger = start waveform, subsequent trigger = load next sequence (if available)

*RST NORMal

BB:AVIO:DME

[:SOURce<ch>]:BB:AVIO:DME:<...>

These commands provide option AVIO DME (distance measuring equipment) modulations.
All commands under BB:AVIO:DME:<...> follow the syntax of the [:SOURce<ch>]:DME:<...> commands.
For example, [SOURce<ch>]:BB:AVIO:DME:STAT ON works similar to [:SOURce<ch>]:DME:STAT ON.
Please refer to the [:SOURce<ch>]:DME subsystem documentation for a detailed description of these commands.

BB:AVIO:ILS

[:SOURce<ch>]:BB:AVIO:ILS:<...>

These commands provide option AVIO ILS (instrument landing system) modulations.
All commands under BB:AVIO:ILS:<...> follow the syntax of the [:SOURce<ch>]:ILS:<...> commands.
For example, [SOURce<ch>]:BB:AVIO:ILS:LOC ON works similar to [:SOURce<ch>]:ILS:LOC ON.
Please refer to the [:SOURce<ch>]:ILS subsystem documentation for a detailed description of these commands.

BB:AVIO:VOR

[:SOURce<ch>]:BB:AVIO:VOR:<...>

These commands provide option AVIO VOR (VHF omnirange navigation system) modulations.
All commands under BB:AVIO:VOR:<...> follow the syntax of the [:SOURce<ch>]:VOR:<...> commands.
For example, [SOURce<ch>]:BB:AVIO:VOR ON works similar to [:SOURce<ch>]:VOR ON.
Please refer to the [:SOURce<ch>]:VOR subsystem documentation for a detailed description of these commands.

BB:AWGN:BANDwidth

[:SOURce<ch>]:BB:AWGN:BANDwidth <float>
[:SOURce<ch>]:BB:AWGN:BANDwidth?

Sets the noise bandwidth if only the additive white gaussian noise is enabled. Only available if all other modulations are disabled.

Range 1Hz to 400MHz

Unit Hz

BB:AWGN:POWer:CNR

[:SOURce<ch>]:BB:AWGN:CNR <float>
[:SOURce<ch>]:BB:AWGN:CNR?

Sets the carrier to noise ratio (CNR) in dB.

Range depends on the AWGN Control Mode (see BB:AWGN:POW:CONT) as well as the output power range of the device.

Unit dB

BB:AWGN:POWer:CARRier

[:SOURce<ch>]:BB:AWGN:POWer:CARRier <float>
[:SOURce<ch>]:BB:AWGN:POWer:CARRier?

Sets the carrier power. Cannot be set if Power Control Mode is TOTal.

Range depends on the output power range of the device.

Unit dBm

BB:AWGN:POWer:CONTrol

[:SOURce<ch>]:BB:AWGN:POWer:CONTrol TOTal|CARRier|NOISe
[:SOURce<ch>]:BB:AWGN:POWer:CONTrol?

This command sets the Power Control Mode for AWGN. The set power of the chosen mode will stay constant, while the CNR changes.

• TOTal. make total output power set by POWer[:...] constant, change both carrier and noise Amplitude to get CNR
• CARRier. make total carrier power constant, change total output and total noise power, s.t. CNR is correct
• NOISe. make total noise power constant, change total output and total carrier power, s.t. CNR is correct

*RST TOTal

BB:AWGN:POWer:NOISe

[:SOURce<ch>]:BB:AWGN:POWer:NOISe <float>
[:SOURce<ch>]:BB:AWGN:POWer:NOISe?

This command sets the total noise power. Cannot be set if Power Control Mode is TOTal.

Range depends on the output power range of the device.

Unit dBm

BB:AWGN[:STATe]

[:SOURce<ch>]:BB:AWGN[:STATe] ON|OFF|1|0
[:SOURce<ch>]:BB:AWGN[:STAT]?

This command enables/disables the use of the AWGN.

*RST OFF

BB:DM:STATe

[:SOURce<ch>]:BB:DM:STATe ON|OFF|1|0
[:SOURce<ch>]:BB:DM:STATe?

This command enables or disables digital modulation.

*RST OFF

BB:DM:CLOCk

[:SOURce]:BB:DM:CLOCk?

This command queries the sampling rate of the DM modulation. It is directly related to the symbol rate, BB:DM:SRATe

*RST 1 MHz

Range 1 Hz to 500 MHz

Unit Hz

BB:DM:PATTern:LENGth

[:SOURce<ch>]:BB:DM:PATTern:LENGth <integer>
[:SOURce<ch>]:BB:DM:PATTern:LENGth?

This command sets the length in bits of the digital modulation data pattern.
The pattern itself is a pseudo random bit sequence.

*RST 4096

Range 1 to 65535

BB:DM:FORMat

[:SOURce]:BB:DM:FORMat QAM8|QAM16|QAM32|QAM64|QAM128|QAM256|QAM512|QAM1024|QAM2048|QAM4096
[:SOURce]:BB:DM:FORM?

This command selects the digital modulation scheme.

*RST QAM64

BB:DM:SRATe

[:SOURce<ch>]:BB:DM:SRATe <float>
[:SOURce<ch>]:BB:DM:SRATe?

This command sets the digital modulation symbol rate.
The sample clock is the symbol rate multiplied by the oversampling factor. Reaching the sample clock limit this command reduces the oversampling factor.

Refer to the [:SOURce<ch>]:BB:ARBitrary:CLOCk and [:SOURce<ch>]:BB:DM:OSAMpling commands for details.

*RST 500 MHz

Range 1 Hz to 500 MHz

Unit Hz

BB:DM:OSAMpling

[:SOURce<ch>]:BB:DM:OSAMpling <integer>
[:SOURce<ch>]:BB:DM:OSAMpling?

This command sets the digital modulation oversampling factor. The oversampling factor is the number of samples used per digital modulation symbol.
The sample clock is the symbol rate multiplied by the oversampling factor. Reaching the sample clock limit this command reduces the symbol rate.

Refer to the [:SOURce<ch>]:BB:ARBitrary:CLOCk and [:SOURce<ch>]:BB:DM:SRATe commands for details.

*RST 8

Range 1 to 32

BB:DM:FILTer:TYPE

[:SOURce<ch>]:BB:DM:FILTer:TYPE COSine|RCOSine|RECTangle|RASymmetric|DIRac|GAUSs
[:SOURce<ch>]:BB:DM:FILTer:TYPE?

This command selects the digital pulse shaping filter. Some pulse shape filters feature a settable filter parameter. Refer to the filter descriptions below and the [:SOURce<ch>]:BB:DM:FILTer:PARameter command.

• COSine. Raised cosine pulse. Filter parameter is roll off factor "beta".
• RCOSine. Root raised cosine pulse. Filter parameter is roll off factor "beta".
• RECTangle. Symmetric rectangular pulse. A trapezoidal boundary shape avoids intersymbol interference peaks. No configurable filter parameter.
• RASymmetric. Asymmetric rectangular pulse. Asymmetric boundaries avoid intersymbol interference peaks. No configurable filter parameter.
• DIRac. Dirac pulse. No configurable filter parameter.
• GAUSs. Gaussian pulse. Filter parameter is "bandwidth x bit time product".

*RST COSine

BB:DM:FILTer:TAPS

[:SOURce<ch>]:BB:DM:FILTer:TAPS <float>{,float}
[:SOURce<ch>]:BB:DM:FILTer:TAPS?

This command sets the taps of the digital pulse shaping filter. The parameter to this command is a comma separated list of all filter taps. Each filter tap is a <float> value with range -1.0 to +1.0. Maximum filter length is 1023.

BB:DM:FILTer:PARameter

[:SOURce<ch>]:BB:DM:FILTer:PARameter <float>
[:SOURce<ch>]:BB:DM:FILTer:PARameter?

This command sets the digital pulse shaping filter parameter.
The filter parameter for all available pulse shape filters is described under [:SOURce<ch>]:BB:DM:FILTer:TYPE.

*RST 0.5

Range 0.0 to 3.0

Unit Hz

BB:GENeral:AM

[:SOURce<ch>]:BB:GENeral:AM

These commands provide amplitude modulation.
All commands under BB:GENeral:AM:<...> follow the syntax of the [:SOURce<ch>]:AM:<...> commands.
For example, [SOURce<ch>]:BB:GEN:AM:STAT ON works similar to [:SOURce<ch>]:AM:STAT ON.
Please refer to the [:SOURce<ch>]:AM subsystem documentation for a detailed description of these commands.

BB:GENeral:FM

[:SOURce<ch>]:BB:GENeral:FM

These commands provide frequency modulation.
All commands under BB:GENeral:FM:<...> follow the syntax of the [:SOURce<ch>]:FM:<...> commands.
For example, [SOURce<ch>]:BB:GEN:FM:STAT ON works similar to [:SOURce<ch>]:FM:STAT ON.
Please refer to the [:SOURce<ch>]:FM subsystem documentation for a detailed description of these commands.

BB:GENeral:PM

[:SOURce<ch>]:BB:GENeral:PM

These commands provide phase modulation.
All commands under BB:GENeral:PM:<...> follow the syntax of the [:SOURce<ch>]:PM:<...> commands.
For example, [SOURce<ch>]:BB:GEN:PM:STAT ON works similar to [:SOURce<ch>]:PM:STAT ON.
Please refer to the [:SOURce<ch>]:PM subsystem documentation for a detailed description of these commands.

[:SOURce<ch>]:FCPort Subsystem

This subsystem provides configuration of the Fast Control Port. It is only available to devices featuring the Fast Control Port (FCP) option.

FCPort:MODE

[:SOURce<ch>]:FCPort:MODE 8|8B|8Bits|16|16B|16Bits
[:SOURce<ch>]:FCPort:MODE?

This command configures the FCP in 16-bit data transfer mode or in 8-bit data transfer mode.
For devices with one common FCP connector (shared by all channels) this setting is common to all channels. Those devices ignore the channel index <ch>.

This setting is not available for vector signal generator devices.

*RST 16Bits

FCPort:DIAGnostic

[:SOURce<ch>]:FCPort:DIAGnostic?

This query returns a short text file containing information gathered in FCP test mode. FCP test mode is enabled by the [:SOURce<ch>]:FCPort:TEST[:STATe] command.

The file content is returned in IEEE488.2 definite block data format:

#<num_digits><byte_count><data byte>{<data_byte}

<num_digits> specifies how many digits are contained in <byte_count>.

<byte_count> specifies how many data bytes follow in <data_bytes>.

Example of definite block data:

#18xxxxxxxx

• #18...: byte count is one digit wide
• #18...: 8 data bytes will follow
• ...xxxxxxxx: 8 bytes of data

The content of the text file (data portion of definite block data) is described in Application Note AN6002 Model 875 – Fast Control Port Interface.

This setting is available for Model 875 devices only.

FCPort:TEST[:STATe]

[:SOURce]:FCPort:TEST[:STATe] ON|OFF|1|0
[:SOURce]:FCPort:TEST[:STATe]?

This command enables or disables the FCP test mode.

Test result information can be obtained by the [:SOURce<ch>]:FCPort:DIAgnostic? query.

Please refer to Application Note AN6002 Model 875 – Fast Control Port Interface for details. This setting is available for Model 875 devices only.

*RST OFF

FCPort:CONTrol:AMPLitude

[:SOURce]:FCPort:CONTrol:AMPLitude ON|OFF|1|0
[:SOURce]:FCPort:CONTrol:AMPLitude?

This command enables or disables the FCP to control the RF output amplitude (output power) word. As long as FCP takes control, parameters of SCPI subsystems SOURce, TRIGger and OUTPut can not be changed.

This setting is not available for vector signal generator devices.

*RST OFF

FCPort:CONTrol:FREQuency

[:SOURce]:FCPort:CONTrol:FREQuency ON|OFF|1|0
[:SOURce]:FCPort:CONTrol:FREQuency?

This command enables or disables the FCP to control the RF frequency word. As long as FCP takes control, parameters of SCPI subsystems SOURce, TRIGger and OUTPut can not be changed.

This setting is not available for vector signal generator devices.

*RST OFF

FCPort:CONTrol:LIST

[:SOURce]:FCPort:CONTrol:LIST ON|OFF|1|0
[:SOURce]:FCPort:CONTrol:LIST?

This command enables or disables the FCP to control the RF frequency by selecting a frequency of a list of pre-defined frequencies. To set-up the frequency list, see [:SOURce<ch>]:LIST:FREQuency. As long as FCP takes control, parameters of SCPI subsystems SOURce, TRIGger and OUTPut can not be changed.

This setting is not available for Model 875.

*RST OFF

FCPort:STREam:CALibrate

[:SOURce]:FCPort:STREam:CALibrate

This command runs a search to find the best input delay. Special input at the FCP is required by the user. Please refer to Application Note AN6002 Model 875 – Fast Control Port Interface for details.

This setting is available for Model 875 devices only.

FCPort:STREam:IQ

[:SOURce]:FCPort:STREam:IQ ON|OFF|1|0
[:SOURce]:FCPort:STREam:IQ?

This command enables or disables FCP streaming IQ data to the IQ modulator.

In order to enable streaming the baseband subsystem must be configured for FCP IQ data streaming too. See [:SOURce<ch>]:BB:ARBitrary:FCPort for details.

This setting is available for Model 875 devices only.

*RST OFF

FCPort:STREam:SEGment

[:SOURce]:FCPort:STREam:SEGment ON|OFF|1|0
[:SOURce]:FCPort:STREam:SEGment?

This command enables or disables FCP streaming segment indices selecting the active waveform segment.

In order to enable streaming segment indices, the baseband subsystem must be configured accordingly:

• Waveform segments must be uploaded, see [:SOURce<ch>]:BB:ARBitrary:WAVeform:DATA and related commands.
• FCP must be selected as the source controlling the active segment, see [:SOURce<ch>]:BB:ARBitrary:WSEGment:SOURce.
• Waveform playback must be enabled, see [:SOURce<ch>]:BB:ARBitrary:WAVeform:STATe.

This setting is available for Model 875 devices only.

:TRIGger Subsystem

Triggers control the playback by telling the signal generator when to play the signal.

Depending on the trigger settings for the signal generator, the waveform playback can occur once, continuously, or the device may start and stop playing the waveform repeatedly (GATE mode). A trigger signal comprises both positive and negative signal transitions (states), which are also called high and low periods. You can configure the signal generator to trigger on either state of the trigger signal. It is common to have multiple triggers, also referred to as trigger occurrences or events, occur when the signal generator requires only a single trigger. In this situation, the device recognizes the first trigger and ignores the rest.

When you select a trigger mode, you may lose the signal from the RF output until you trigger the waveform.

There are four parts to configuring the trigger:

1. Choosing the trigger type which controls the waveform's transmission.

• NORMal: trigger edge starts sweep
• POINt: trigger edge plays the next point
• GATE: trigger level starts/stops sweep

2. Setting the waveform's response to triggers:

• CONTinuous: repeatedly accepts trigger events
• SINGle: uses only one trigger event

3. Selecting the trigger source which determines how the device receives its trigger signal, internally or externally. The GATE choice requires an external trigger.

4. Setting the trigger polarity when using an external source.

TRIGger:[SEQuence][:IMMediate]

:TRIGger[:SEQuence]:IMMediate

This command triggers the device immediately if it is configured to wait for trigger events.

Immediate triggering is forced regardless of the selected trigger source.

TRIGger[:SEQuence]:TYPE

:TRIGger[:SEQuence]:TYPE NORMal|GATE|POINT
:TRIGger[:SEQuence]:TYPE?

This command sets the trigger type that controls the waveform's playback.

The following list describes the trigger type command choices:

• NORMal. Upon triggering, the waveform sequence plays according to settings defined by :INITiate:CONTinuous (only once or repeatedly)
• GATE. An external trigger signal repeatedly starts and stops the waveform's playback. The time duration for playback depends on the duty period of the trigger signal and the gate polarity selection. The waveform plays during the inactive state and stops during the active polarity selection state. The activestate can be set high or low. The gate mode works only with an external trigger source.
• POINt. Upon triggering, only a single point of the sweep (list) is played.

*RST NORMal

TRIGger[:SEQuence]:SOURce

:TRIGger[:SEQuence]:SOURce IMMediate|KEY|EXTernal|BUS
:TRIGger[:SEQuence]:SOURce?

This command sets the trigger source.

• IMMediate. No waiting for a trigger event occurs
• KEY. This choice enables manual triggering by pressing the front-panel RF on/off.
• EXTernal. This choice enables the triggering of a sweep event by an externally applied signal at the MOD IN connector.
• BUS. This choice enables triggering over the remote control interface using the :TRIGger[:SEQuence][:IMMediate], *TRG or GET (group execute trigger) commands.

*RST IMMediate

TRIGger[:SEQuence]:DELay

:TRIGger[:SEQuence]:DELay <value>
:TRIGger[:SEQuence]:DELay?

This command sets the amount of time to delay the Model 870A response to an external trigger.

The delay is a path (time) delay between when the Model 870A receives the trigger and when it responds to the trigger. The delay does not occur until you turn it on. You can set the delay value either before or after turning it on.

*RST 0 s

Range 0 to 20 s

Unit s

TRIGger[SEQuence]:SLOPe

:TRIGger[:SEQuence]:SLOPe POSitive|NEGative|NP|PN
:TRIGger[:SEQuence]:EXTernal:SLOPe?

This command sets the polarity for an external trigger signal while using the continuous, single triggering mode.

• POSitive|NEGative. In normal or point mode selected by :TRIGger[:SEQuence]:TYPE NORMal|POINT the trigger system reacts to the rising (positive) or falling (negative) edge of the external trigger signal.
  In gated mode selected by :TRIGger[:SEQuence]:TYPE GATE the trigger is active while the external signal is high (positive) or low (negative). For example, when you select POSitive, the waveform responds (plays) during the high state of the external trigger signal.
• NP|PN. (Devices without option FS only)
  In normal or point mode selected by :TRIGger[:SEQuence]:TYPE NORMal|POINT the trigger system reacts to both rising and falling edges of the trigger signal. NP selects falling, PN selects rising edge first.

When the Model 870A receives multiple trigger occurrences when only one is required, the signal generator uses the first trigger and ignores the rest.

*RST POSitive

TRIGger:[SEQuence]:ECOunt

:TRIGger[:SEQuence]:ECOunt <integer>
:TRIGger[:SEQuence]:ECOunt?

This command sets a modulus counter on consecutive trigger events. Setting the value to N means that only every Nth trigger event will be considered. Setting it to one means will use every trigger event that does not occur during a running sweep.

*RST 1

Range 1 to 255

TRIGger:OUTPut:POLarity

:TRIGger:OUTPut:POLarity NORMal|INVerted
:TRIGger:OUTPut:POLarity?

This command sets the trigger output signal polarity.

• NORMal. The idle state of the trigger output signal is low. A high pulse or high signal is played upon trigger events or when the RF output signal is valid.
• INVerted. The idle state of the trigger output signal is high. A low pulse or low signal is played upon trigger events or when the RF output signal is valid.

Note that the low frequency output must be configured for trigger output by sending the [:SOURce]:LFOutput:SOURce TRIGger and [:SOURce]:LFOutput:STATe ON commands.

*RST NORMal

TRIGger:OUTPut:MODE

:TRIGger:OUTPut:MODE NORMal|GATE|POINt|VALid
:TRIGger:OUTPut:MODE?

This command sets the trigger output signal mode.

• NORMal. The trigger output signal is pulsed once whenever playing a waveform sequence is triggered.
• GATE. The trigger output signal is set when playing a waveform sequence is triggered, and reset when playing stops. Not available with option FS.
• POINt. The trigger output signal is pulsed for each point of the sweep (list) playing.
• VALid. The trigger output is set while the RF output signal at one or multiple channels is valid (settled).

Note that the low frequency output must be configured for trigger output by sending the [:SOURce]:LFOutput:SOURce TRIGger and [:SOURce]:LFOutput:STATe ON commands.

*RST NORMal

TRIGger:OUTPut[:VALid]:SOURce

:TRIGger:OUTPut[:VALid]:SOURce ALL|<integer>
:TRIGger:OUTPut[:VALid]:SOURce?

This command selects the source channel for the trigger output and the RF output valid signal.

• ALL. In :TRIGger:OUTPut:MODE VALid mode: the trigger output is set while RF output of all currently enabled channels is valid (settled) and reset while any of the outputs has no valid RF signal (transient).
  In all other :TRIGger:OUTPut:MODE modes: the trigger output is set while any of the individual channels trigger output signals is set (logical "or" over all channels).
• <integer>. Depending on :TRIGger:OUTPut:MODE the trigger output is set while RF output of the selected channel is valid (settled) or while the selected channels trigger output signal is set.

*RST 1

Range ALL|1 to number of channels

TRIGger:SYNChronous

:TRIGger:SYNChronous[:IMM]

This command triggers all subsystems listening to synchronous trigger sources.
Immediate triggering is forced regardless of the selected trigger source.

This command is available for Model 875 devices only.

TRIGger:SYNChronous:SLOPe

:TRIGger:SYNChronous:SLOPe POSitive|NEGative
:TRIGger:SYNChronous: SLOPe?

This command sets the polarity for an external synchronous trigger signal.

This setting is available for Model 875 devices only.

*RST POSitive

TRIGger:SYNChronous:SOURce

:TRIGger:SYNChronous:SOURce BUS|EXTernal|KEY
:TRIGger:SYNChronous:SOURce?

This command sets the synchronous trigger source.

This setting is available for Model 875 devices only.

*RST BUS

TRIGger:SYNChronous:SOURce:CHANnel

:TRIGger:SYNChronous:SOURce:CHANnel <integer>
:TRIGger:SYNChronous:SOURce:CHANnel?

This command sets the master channel for the synchronous trigger system.

This command exists only for compatibility with other command subsystems supporting multiple channels. Only channel 1 can be the master channel, so the command form is ignored and the query form will always return 1.

This setting is available for Model 875 devices only.

*RST 1

TRIGger:SYNChronous:EXTernal:SOURce

:TRIGger:SYNChronous:EXTernal:SOURce[:PORT] MF1|MF2
:TRIGger:SYNChronous:EXTernal:SOURce?

This command selects the source port of the external trigger signal.

This setting is available for Model 875 devices only.

*RST MF1

:AIN Subsystem

The AIN subsystem controls the analog inputs. This subsystem is available for Model 875 devices only.

AIN[:STATe]

:AIN[:STATe] ON|OFF|1|0
:AIN[:STATe]?

Enable/Disable the analog input (AIN) ports.

*RST OFF

AIN<ch>:SOURce

:AIN<ch>:SOURce QIN|IIN
:AIN<ch>:SOURce?

Set the port source for AIN1 or AIN2, using the corresponding channel <ch> numbers.

Per default, AIN1 and AIN2 are connected to IIN and QIN respectively.

The same single port (IIN/QIN) can technically feed both AIN channels if desired.

*RST QIN

AIN:CALibrate:ZERO

Calibrates the zero offset for an analog input AIN channel.
Expects an input of 0.0V DC at the AIN channel.

AIN<ch>:GAIN

:AIN<ch>:GAIN <float>
:AIN<ch>:GAIN?

This command set a scalar gain on the selected AIN channel which is applied to the input before being used by any modulation subsystem.

• <double>. Value of the gain, maximum and minimum values depend on the zero-calibration

Range -2.0 V to 2.0 V

*RST 1

AIN<ch>:OFFSet

:AIN<ch>:OFFSet <float>
:AIN<ch>:OFFSet?

This command set the channel specific offset. The value is in Volts and is includes the calibration offset.

• <double>. Value of the total offset

*RST 0 V

Range -0.56 V to 0.56 V

AIN<ch>:OLOad:STATe?

:AIN<ch>:OLOad:STATe? <bool>

This query returns the current overload state of the AIN<ch> input.

• 0. No overload
• 1. Overload

*RST 0

AIN<ch>:OLOad:HOLD:STATe?

:AIN<ch>:OLO:HOLD:STATe? <bool>

This query indicates if an overload has occurred since the last overload reset.

• 0. No overload has occurred since the last overload reset.
• 1. An overload has occurred since the last overload reset.

*RST 0

AIN<ch>:OLOad:HOLD:RESet

:AIN<ch>:OLOad :HOLD :RESet

This command executes a reset of the overload hold state.

*RST 0

AIN<ch>:OVRange:STATe?

This query returns the current overrange state of the AIN<ch> input.

• 0. No overrange
• 1. Overrange

*RST 0

AIN<ch>:OVRange:HOLD:STATe?

This query indicates if an overrange has occurred since the last overrange reset.

• 0. No overrange has occurred since the last overrange reset.
• 1. An overrange has occurred since the last overrange reset.

*RST 0

AIN<ch>:OVRange:HOLD:RESet

AIN<ch>:OVR:HOLD:RESet

This command executes a reset of the overrange hold state.

*RST 0

AIN<ch>:VOLTage? [MIN|MAX]

AIN<ch>:VOLTage? <float>

This query gets the current input voltage of an AIN channel. The returned value does not include the calibrated offset correction. The command can also optionally return the specified minimal and maximal voltage that are allowed at the AIN ports.

Range -0.56 V to 0.56 V

:IQ Subsystem

The IQ subsystem controls the IQ modulator. This subsystem is available for Model 875 devices only.

IQ:STATe

[:SOURce]:IQ:STATe ON|OFF|1|0
[:SOURce]:IQ:STATe?

This command enables or disables all IQ modulations.

*RST ON

IQ:CRESt:AUTOmatic?

[:SOURce]:IQ:CRESt:AUTOmatic?

This command queries the crest factor value of the last active automatic crest factor correction
Not including AWGN crest Factor.

Available for modulations: CIQ, IVM, ANLG, DME, ILS, VOR

*RST 0

Range -70 to 20

Unit dB

IQ:CRESt:AWGN?

[:SOURce]:IQ:CRESt:AWGN?

This command queries the crest factor value for AWGN (additive crest Factor of Noise).

*RST 0

Range -70 to 20

Unit dB

IQ:CRESt:MANual

[:SOURce]:IQ:CRESt:MANual <float>
[:SOURce]:IQ:CRESt:MANual?

Sets the crest factor manually to compensate for the RMS value of an active IQ modulation.
Only active while a modulation with manual crest factor is enabled.
Returns the set value, regardless of which modulation is active.

*RST 0

Range -70 to 20

Unit dB

IQ:CRESt:TOTal?

[:SOURce]:IQ:CRESt:TOTal?

This command queries the current active total crest factor value.

*RST 0

Range -70 to 20

Unit dB