Keysight x-series Programmer's Reference

3 VMA Mode
3.1 Digital Demod Measurement
The Center Frequency setting is the same for all measurements within a mode, that
is, it is Meas Global. Some Modes are also able to share a Mode Global center
frequency value. If this is the case, the Mode will have a Global tab in its Meas Setup
menu.
This function sets (and queries) the center frequency for the currently selected input.
If your instrument has multiple inputs, and you select another input, Center
Frequency changes to the value for that input. SCPI commands are available to
directly set the center frequency for a specific input.
This setting is remembered as you go from input to input. Thus you can set a Center
Frequency of 10 GHz with the RF Input selected, change to BBIQ and set a Center
Frequency of 20 MHz, then switch to External Mixing and set a Center Frequency of
60 GHz, and when you go back to the RF Input the Center Frequency will revert to
10 GHz; back to BBIQ and it is 20 MHz; back to External Mixing and it is 60 GHz.
Remote Command
[:SENSe]:FREQuency:CENTer <freq>
[:SENSe]:FREQuency:CENTer?
Example
:FREQ:CENT 50 MHz
Sets Center Frequency to 50 MHz
:FREQ:CENT UP
Increments the Center Frequency by the value of CF Step
:FREQ:CENT?
Returns the current value of Center Frequency
Notes Sets the RF, External Mixing or I/Q Center Frequency depending on the selected input:
–
For RF input, equivalent to FREQ:RF:CENT
–
For I/Q input, equivalent to FREQ:IQ:CENT
–
For External Mixer, equivalent to FREQ:EMIX:CENT
Preset and Max values are dependent on Hardware Options (5xx)
If no terminator (for example, MHz) is sent, the terminator Hz is used. If a terminator with unit other
than Frequency is sent, an invalid suffix error message is generated
Dependencies Center Frequency can be limited if the Span is such that the range of the instrument is exceeded
Preset 1 GHz
See "RF Center Freq" on page 286, "Ext Mix Center Freq" on page 286, and "I/Q Center Freq" on page
287
State Saved Saved in instrumen
Min/Max Depends on the selected input
See "RF Center Freq" on page 286, and "I/Q Center Freq" on page 287e
Annotation Center <value> appears in the lower left corner of the display
Status Bits/OPC
dependencies
Non-overlapped
285 Vector Modulation Analyzer Mode User's &Programmer's Reference

Keysight x-series Specifications

General

Analysis Bandwidth	Up to 1 GHz (depending on model)
Real-Time Bandwidth	Up to 1 GHz (depending on model)
Form Factor	Benchtop
Connectivity	LAN, USB, GPIB
Resolution Bandwidth	1 Hz to 10 MHz (depending on model)