3 VMA Mode
3.4 IQ Waveform Measurement
CF Step
Lets you change the step size for "Center Frequency" on page 738, and Start/Stop
frequency. 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]?
Example Increase the current Center Frequency value by 500 MHz:
:FREQ:CENT:STEP 500 MHz
:FREQ:CENT UP
Notes Preset and Max values depend on Hardware Options
Dependencies Only available in VMA, W-CDMA, and WLAN Modes
If the electronic/soft attenuator is enabled, any attempt to change the value of the center frequency
>3.6 GHz by pressing the Up-arrow key 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 Auto
State Saved Saved in instrument state
Min/Max –/+ (the maximum frequency of the instrument). That is, 27 GHz max freq instrument has a CF step
range of +/- 27 GHz. Note that this is the maximum frequency given the current settings of the
instrument, so in External Mixing, for example, it is the maximum frequency of the current mixer band
Status Bits/OPC
dependencies
non-overlapped
Auto Function
Remote
Command
[:SENSe]:FREQuency:CENTer:STEP:AUTO OFF | ON | 0 | 1
[:SENSe]:FREQuency:CENTer:STEP:AUTO?
Example
:FREQ:CENT:STEP:AUTO ON
:FREQ:CENT:STEP:AUTO?
Preset
ON
3.4.7 Marker
Displays a menu that enables you to select, set up and control the markers for the
current measurement.
Vector Modulation Analyzer Mode User's &Programmer's Reference 744
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