3 VMA Mode
3.9 SEM Measurement
I/Q Center Freq
Sets the center frequency to use when the I/Q input is selected, even if the I/Q input
is not the selected input 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 "Center Frequency" on page 1465, and start and stop
frequency functions. 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.
Remote Command
[:SENSe]:FREQuency:CENTer:STEP[:INCRement] <freq>
[:SENSe]:FREQuency:CENTer:STEP[:INCRement]?
[:SENSe]:FREQuency:CENTer:STEP:AUTO OFF | ON | 0 | 1
[:SENSe]:FREQuency:CENTer:STEP:AUTO?
Example
:FREQ:CENT:STEP 500 MHz
increases the current center frequency value by 500 MHz
:FREQ:CENT UP
:FREQ:CENT:STEP?
:FREQ:CENT:STEP:AUTO ON
:FREQ:CENT:STEP:AUTO?
Notes Preset and Max values depend on Hardware Options
Dependencies Not available in the MSR, LTE-A FDD/TDD and 5G NR Modes
If the electronic/soft attenuator is enabled, any attempt to change the value of the Center Frequency
Vector Modulation Analyzer Mode User's &Programmer's Reference 1470
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