Keysight x-series User Manual

3 Spectrum Analyzer Mode
3.7 Burst Power Measurement
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
Preset See tables in "Center Frequency Presets" on page 1304 above
State Saved Saved in instrument state
Min -79.999995 MHz
Max See tables in "Center Frequency Presets" on page 1304 above
Basically instrument maximum frequency - 5 Hz
Ext Mix Center Freq
Specifies the External Mixer Center Frequency. Sets the Center Frequency to be
used 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 Center
Frequency 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?
Example
:FREQ:EMIX:CENT 60 GHz
:FREQ:EMIX: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
Couplings When returning to External Mixing after having been switched to one of the other inputs (for example,
RF), you will return to the settings that you had when you left External Mixing. So you will return to the
band you were in with the Center Frequency that you had.However, Span is not an input-dependent
parameter, so the span setting from the other input will be retained. Therefore, the instrument returns
to the span setting from the previous input, limited as necessary by the current mixer setup
Preset When a Mode Preset is performed while in External Mixing, the Start frequency of the current Mode is
set to the nominal Min Freq of the lowest harmonic range in the Harmonic Table for the current mixer
setup. Similarly, the Stop frequency of the current Mode is set to the nominalMax Freq of the highest
harmonic range in the Harmonic Table. The Center Frequency thus presets to the point arithmetically
equidistant from these two frequencies
Note that, if the current measurement has a limited Span available to it, and cannot achieve the Span
shown in the table (Span=Stop Freq – Start Freq), the instrument uses the maximum Span the
measurement allows, and still sets the Center Freq to the midpoint of the Start and Stop Freq values in
the Harmonic Table
When Restore Input/Output Defaults is performed, the mixer presets to the 11970A, whose Start and
Stop frequencies are 26.5 and 40GHz respectively. The center of these two frequencies is 33.25GHz
Therefore, after a Restore Input/Output Defaults, if you go into External Mixing and do a Mode Preset
while in the Spectrum Analyzer Mode, the resulting Center Freq is 33.25GHz
1306 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)