3 VMA Mode
3.1 Digital Demod Measurement
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 nominal Max Freq of the highest
harmonic range in the Harmonic Table. The Center Freq thus presets to the point arithmetically
equidistant from these two frequencies
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
State Saved Yes
Min The minimum frequency in the currently selected mixer band + 5 Hz
If the knob or step keys are being used, also depends on Span
Max The maximum frequency in the currently selected mixer band - 5 Hz
If the knob or step keys are being used, also depends on Span
I/Q Center Freq
Specifies the I/Q Center Frequency. Sets the Center Frequency to be used when the
I/Q input is selected, even if the I/Q 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:IQ:CENTer <freq>
[:SENSe]:FREQuency:IQ:CENTer?
Example
:FREQ:IQ:CENT 30 MHz
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
Preset 0 Hz
State Saved Saved in instrument state
Min -40.049995 MHz
Max 40.049995 MHz
CF Step
Changes the step size for the center frequency.
Remote Command
[:SENSe]:FREQuency:CENTer:STEP[:INCRement] <freq>
[:SENSe]:FREQuency:CENTer:STEP[:INCRement]?
287 Vector Modulation Analyzer Mode User's &Programmer's Reference
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