Keysight x-series Programmer's Reference

3 VMA Mode
3.1 Digital Demod Measurement
Parameter SOQPSK-TG SOQPSK-A SOQPSK-B
Modulation Format Shaped Offset QPSK Shaped Offset QPSK Shaped Offset QPSK
Info BW 12.8 MHz 12.8 MHz 12.8 MHz
Symbol Rate 5 MHz 5 MHz 5 MHz
Meas Filter None None None
Ref Filter OQPSK-TG (IRIG 106-04) SOQPSK-A SOQPSK-B
Filter Alpha
Points / Symbol 10 10 10
Meas Interval 1000 symbols 1000 symbols 1000 symbols
Search Length
Burst Search Off Off Off
Sync Search Off Off Off
If the acquisition hardware does not support the default Info BW, then the Info BW
will be set to the closest value that the acquisition hardware can support.
3.1.9.4 Frame
Enables you to set frame structure for measurement.
Search Length
Defines the time length that the instrument searches for a burst and/or sync word.
There are two Search Length modes:
–
Manual: Lets you manually set the Search Length
–
Automatic: Sets Search Length automatically according to Meas Interval, Meas
Offset and Symbol Rate (longest Segment for multiple Segment case). This is
recommended mode for wide band signal (>1GHz) analysis, to avoid
unnecessary long Search Length setting leads to slow measurement speed
Remote
Command
[:SENSe]:DDEMod:SYNC:SLENgth <time>
[:SENSe]:DDEMod:SYNC:SLENgth?
[:SENSe]:DDEMod:SYNC:SLENgth:AUTO OFF | ON | 0 | 1
[:SENSe]:DDEMod:SYNC:SLENgth:AUTO?
Example
:DDEM:SYNC:SLEN 3.0 ms
Set the search length to 3 ms
:DDEM:SYNC:SLEN?
:DDEM:SYNC:SLEN:AUTO OFF
Vector Modulation Analyzer Mode User's &Programmer's Reference 322

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)