Keysight x-series Programmer's Reference

3 VMA Mode
3.1 Digital Demod Measurement
Gain Imb/Quad Skew Coupling
Controls what measurement data is included in the Quadrature Skew Error and IQ
Gain Imbalance error data calculations.
–
Off: Calculations use one Point per Symbol
–
On: Calculations use the value shown in the Points per Symbol parameter box
Remote
Command
:CALCulate:DDEMod:SEGMent1|…|6:PPSYmbol:COUPle OFF | ON | 0 | 1
:CALCulate:DDEMod:SEGMent1|…|6:PPSYmbol:COUPle?
Example
:CALC:DDEM:SEGM1:PPSY:COUP ON
:CALC:DDEM:SEGM1:PPSY:COUP?
Notes Available for all IQ formats except Custom IQ format
Preset
OFF
State Saved Yes
Backwards
Compatibility
SCPI
:CALCulate:DDEMod:PPSYmbol:COUPle
Clock Adjust
Enables you to adjust symbol clock timing in fractions of a symbol. The adjustment
is relative to the symbol clock time that is computed by the demodulation algorithm.
Some digital communications systems contain nonlinearities that can bias the
digital demodulator's estimation of the symbol clock position. You can use clock
adjust to compensate for this offset and obtain a lower EVM (Error Vector
Magnitude).
Specifying a clock adjust only affects the I/Q measured trace. It does not affect the
I/Q reference trace.
Use the eye diagram with an eye length of one (1) to observe the accuracy of the
symbol clock timing. You can also monitor the EVM (Error Vector Magnitude) in the
metrics table while adjusting clock adjust to obtain the optimum symbol timing.
Clock adjust is reset to 0.0 on power-up or when you select Preset.
Remote Command
[:SENSe]:DDEMod:SEGMent1|…|6:CADJust <real>
[:SENSe]:DDEMod:SEGMent1|…|6:CADJust?
Example
:DDEM:SEGM1:CADJ 0.5
:DDEM:SEGM1:CADJ?
Preset 0.0
Vector Modulation Analyzer Mode User's &Programmer's Reference 346

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)