3 VMA Mode
3.1 Digital Demod Measurement
–
Manual: This selection enables the user to manually set the deviation reference
–
Automatic: This selection uses an average measured frequency deviation
Available only when the demodulation format is 2-FSK.
Remote
Command
[:SENSe]:DDEMod:SEGMent1|…|6:FSK:DEViation:REFerence <freq>
[:SENSe]:DDEMod:SEGMent1|…|6:FSK:DEViation:REFerence?
[:SENSe]:DDEMod:SEGMent1|2:FSK:DEViation:REFerence:AUTO OFF | ON | 0 | 1
[:SENSe]:DDEMod:SEGMent1|2:FSK:DEViation:REFerence:AUTO?
Example
:DDEM:SEGM1:FSK:DEV:REF 50 kHz
:DDEM:SEGM1:FSK:DEV:REF?
:DDEM:SEGM1:FSK:DEV:REF:AUTO ON
:DDEM:SEGM1:FSK:DEV:REF:AUTO?
Couplings If the modulation format is not FSK formats, this control is grayed-out
When the user manually changes the FSK Deviation Reference, this set automatically goes to ‘Man’
Preset 20 kHz
ON
State Saved Saved in instrument state
Yes
Range Auto|Man
Min 10 Hz
Max 1 GHz
Backwards
Compatibility
SCPI
[:SENSe]:DDEMod:FSK:DEViation:REFerence
[:SENSe]:DDEMod:FSK:DEViation:REFerence:AUTO
APSK
Allows you to configure advanced parameters for APSK modulation format.
APSK R2 / R1
Enables you to specify the expected ratio between the two inner rings for APSK
modulation formats.
APSK R2 / R1 determines the Ring 2 to Ring 1 ratio for APSK format measurements.
The ring ratio is the ratio of the magnitude of symbol states on a ring (R2) to the
magnitude of symbol states on the inner ring (R1). R2 / R1 is a valid parameter for
both 16 APSK and 32 APSK format measurements.
Vector Modulation Analyzer Mode User's &Programmer's Reference 352
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