Keysight x-series User Manual

3 Spectrum Analyzer Mode
3.3 Channel Power Measurement
CF Step
Changes the step size for Center Frequency and start and stop frequency functions.
Once a step size has been selected and the center frequency function is active, the
step keys (and the UP|DOWN parameters for Center Frequency from remote
commands) change the center frequency by the step-size value. The step size
function is useful for finding harmonics and sidebands beyond the current frequency
span of the instrument.
Note that the start and stop frequencies also step by the CF Step value.
Remote Command
[:SENSe]:FREQuency:CENTer:STEP[:INCRement] <freq>
[:SENSe]:FREQuency:CENTer:STEP[:INCRement]?
Example Increase the current center frequency value by 500 MHz:
:FREQ:CENT:STEP 500 MHz
:FREQ:CENT UP
Notes Preset and Max values depend on Hardware Options
Dependencies If the electronic/soft attenuator is enabled, any attempt to change the value of the center frequency
>3.6 GHz by pressing the Up-arrow key, fails and results in an advisory message. If the equivalent
SCPI command is sent, this same message is generated as part of a “-221, Settings conflict” warning
Not available in the MSR, LTE-A FDD/TDD and 5G NR Modes
Couplings When auto-coupled, the center frequency step size is set to 10% of the span
Preset Auto
State Saved Saved in instrument state
Min/Max –/+ (the maximum frequency of the instrument)
That is, 27 GHz max freq instrument has a CF step range of ±27 GHz. Note that this is the maximum
frequency given the current settings of the instrument, so in External Mixing, for example, it is the
maximum frequency of the current mixer band
Status Bits/OPC
dependencies
non-overlapped
Auto Function
Remote
Command
[:SENSe]:FREQuency:CENTer:STEP:AUTO OFF | ON | 0 | 1
[:SENSe]:FREQuency:CENTer:STEP:AUTO?
Example
:FREQ:CENT:STEP:AUTO ON
:FREQ:CENT:STEP:AUTO?
Freq Offset
Enables you to set a frequency offset value to account for frequency conversions
outside of the instrument. This value is added to the display readout of the marker
Spectrum Analyzer Mode User's &Programmer's Reference 631

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)