Keysight x-series User Manual

3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
CF Step
Changes the step size for the 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" on page
281 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 Span, RBW, Center frequency
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
Couplings When auto-coupled in a non-zero span, the center frequency step size is set to 10% of the span.
When auto-coupled in Zero Span, the center frequency step size is set to the equivalent -3 dB RBW
value
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?
Preset
ON
300 Spectrum 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)