Keysight x-series Programmer's Reference

3 VMA Mode
3.1 Digital Demod Measurement
MSK1 | MSK2 | APSK16 | APSK32 | ASK2 | VSB8 | VSB16 | CPMFM | EDGE |
DVBQAM16 | DVBQAM32 | DVBQAM64 | DVBQAM128 | DVBQAM256 | DBPSK | CUSTOMIQ
[:SENSe]:DDEMod:SEGMent1|…|6:MODulation?
Example
:DDEM:SEGM1:MOD QPSK
:DDEM:SEGM1:MOD?
Preset
QPSK
State Saved Yes
Range BPSK | QPSK | OffsetQPSK | Shaped Offset QPSK | π/4DQPSK | DQPSK | 8PSK | π/8DPSK8 | D8PSK |
QAM16 | QAM32 | QAM64 | QAM128 | QAM256 | QAM512 | QAM1024 | FSK2 | FSK4 | FSK8 |
FSK16 | FSK 32 | FSK 64 | MSKType1 | MSKType2 | APSK16 | APSK32 | ASK 2 | VSB8 | VSB16 | CPM
(FM) | EDGE | DVB QAM 16 | DVB QAM 32 | DVB QAM 64 | DVB QAM 128 | DVB QAM 256 |
DBPSK|CUSTOMIQ
Backwards
Compatibility
SCPI
[:SENSe]:DDEMod:MODulation
NOTE
DVB QAM formats conform to Digital Video Broadcast standard EN 300 429. The
standard defines the bits that represent each state as follows:
The first two bits are differentially encoded so that pi/2 rotations in the QAM
constellation do not affect detection of the two MSBs.
The LSBs are positioned to be rotation-invariant as defined in EN 300 429.
Unlike QAM, DVB QAM does not compensate for I/Q offset. When the format is
DVB QAM, the measurement reports I/Q offset in the metrics table, but doesn't
remove it from the other results calculation. When the format is QAM, the
measurement reports I/Q offset in the metrics table AND removes it from the
other results calculation. So the EVM result for DVB QAM will be higher than
QAM.
Symbol Rate
Enables you to set the symbol rate (symbols per second) for the instrument's digital
demodulator. Set this parameter to match the symbol rate of your system.
Remote Command
[:SENSe]:DDEMod:SEGMent1|…|6:SRATe <frequency>
[:SENSe]:DDEMod:SEGMent1|…|6:SRATe?
Example
:DDEM:SEGM1:SRAT 1 MHz
:DDEM:SEGM1:SRAT?
Couplings Changes when Info BW is smaller than Symbol Rate/10
Preset 1.0 MHz
State Saved Yes
327 Vector Modulation Analyzer Mode User's &Programmer's Reference

Keysight x-series Specifications

General

Analysis Bandwidth	Up to 1 GHz (depending on model)
Real-Time Bandwidth	Up to 1 GHz (depending on model)
Form Factor	Benchtop
Connectivity	LAN, USB, GPIB
Resolution Bandwidth	1 Hz to 10 MHz (depending on model)