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Common Measurement Functions
FREQ Channel
Ext Mix Center Freq
SCPI command for specifying the External Mixer Center Frequency. This command will set 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 the
Center Freq function in the
Frequency menu on the front panel always applies to the currently selected input.
Preset: See table above
State Saved: Saved in instrument state.
Min: –79.999995 MHz, unless Source Mode is set to Tracking, in which case it is
limited by the minimum frequency of the Source
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
Initial S/W Revision: Prior to A.02.00
Modified at S/W Revision: A.03.00
Scope: Meas Global
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 (e.g., RF), you will come back into the settings that you had
when you left External Mixing. So you will come back to the band you were
in with the Center Frequency that you had. However, Span is not an
input-dependent parameter, therefore you will bring the span over from the
other input. Therefore, the analyzer comes back with the span from the
previous input, limited as necessary by the current mixer setup.