Keysight x-series User Manual

3 Spectrum Analyzer Mode
3.4 Occupied BW Measurement
:FREQ:RF:CENT?
Notes This command is the same in all Modes, but the parameter is Measurement Global. So, the value is
independent in each Mode and common across all the measurements in the Mode
Dependencies If the electronic/soft attenuator is enabled, any attempt to set Center Frequency such that the Stop
Frequency would be >3.6GHz 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
If Source Mode is set to Tracking, and the Max or Min Center Frequency is therefore limited by the
limits of the source, a warning message is generated, “Data out of range; clipped to source max/min” if
these limits are exceeded. Note that for an external source, these limits can be affected by the settings
of Source Numerator, Source Denominator, and Power Sweep
Preset See "Center Frequency Presets" on page 785
State Saved Saved in instrument state
Min
Instrument Types Value
VXT model M9421A 55.000005MHz
VXT models M9410A/11A 6.505kHz with Option
LFE
330.000005MHz
without Option LFE
330.000005MHz
VXT model M9415A 330.000005MHz
M8920A 80.005kHz
All other instruments
Unless Source Mode is set to Tracking, in which case it is limited by
the minimum frequency of the Source
–79.999995MHz
Max See table above. Basically, instrument maximum frequency – 5Hz. Note that, if the Source Mode is set
to Tracking, the effective instrument maximum frequency may be limited by the source maximum
frequency
If the knob or step keys are being used, also depends on the value of the other three interdependent
parameters: Span, Start Frequency and Stop Frequency
Ext Mix Center Freq
Specifies the External Mixer Center Frequency. Sets the center frequency to use
when the External Mixer is selected, even if the External Mixer input is not the input
which is selected at the time the command is sent. Note that the Center Frequency
function in the Frequency menu on the front panel always applies to the currently
selected input.
Remote
Command
[:SENSe]:FREQuency:EMIXer:CENTer <freq>
[:SENSe]:FREQuency:EMIXer:CENTer?
Spectrum Analyzer Mode User's &Programmer's Reference 787

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)