3 VMA Mode
3.1 Digital Demod Measurement
Equalization is applied to time-domain data. For best results, make sure you select a
frequency span that contains all the energy of your signal. If significant energy from
your signal falls outside of the displayed frequency span, equalization will not work
on your signal.
You can define the length of the equalization filter (in symbols) and set the
convergence (convergence determines the size of the steps used to reshape the
equalization filter). For additional details about these parameters,
see"Convergence" on page 343 and "Filter Length" on page 342.
The following parameters affect measurement speed when using adaptive
equalization:
–
meas interval
–
filter length (for the equalization filter)
–
points/symbol
Remote
Command
[:SENSe]:DDEMod:SEGMent1|…|6:EQUalization:STATe OFF | ON | 0 | 1
[:SENSe]:DDEMod:SEGMent1|…|6:EQUalization:STATe?
Example
:DDEM:SEGM1:EQU:STAT ON
:DDEM:SEGM1:EQU:STAT?
Preset
OFF
State Saved Yes
Backwards
Compatibility
SCPI
[:SENSe]:DDEMod:EQUalization:STATe
Sync Search
Turns the Sync Word search on or off. Sync Search enables you to use a
synchronization pattern to isolate a segment of your signal for display and analysis.
NOTE
The sync pattern must be a multiple of the number of bits-per-symbol. For
example, if the number of bits-per-symbol is 4 (as with 16 QAM), then the
number of bits in the sync pattern must be a multiple of four. Sync search
enables you to specify any number of bits for the sync pattern; however, bits that
are not a multiple of the bits-per-symbol are truncated.
Remote
Command
[:SENSe]:DDEMod:SYNC:SWORd[:STATe] OFF | ON | 0 | 1
[:SENSe]:DDEMod:SYNC:SWORd[:STATe]?
Example
:DDEM:SYNC:SWOR OFF
Turn off the sync word search
Vector Modulation Analyzer Mode User's &Programmer's Reference 330
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