3 VMA Mode
3.10 Spurious Emissions Measurement
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. Center Frequency thus presets to the point arithmetically
equidistant from these two frequencies
Note that, if the current measurement has a limited span/range available to it, and cannot achieve the
span shown in the table (Range = Stop Freq – Start Freq), the instrument uses the maximum span the
measurement allows, and still sets Center Frequency 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 Restore Input/Output Defaults, if you go to External Mixing and do Mode Preset while in
Spectrum Analyzer Mode, the resulting Center Frequency 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 Range
Max The maximum frequency in the currently selected mixer band –5 Hz
If the knob or step keys are being used, also depends on Range
I/Q Center Freq
Specifies the I/Q Center Frequency. Sets the center frequency to use when the I/Q
input is selected, even if the I/Q input is not the input that 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/Max –/+40.049995 MHz
CF Step
Changes the step size for "Center Frequency" on page 1685. 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 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.
Vector Modulation Analyzer Mode User's &Programmer's Reference 1666
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