Keysight x-series Programmer's Reference

3 VMA Mode
3.1 Digital Demod Measurement
Error Vector Spectrum is the frequency spectrum of the Error Vector Time trace
data. The demodulator produces the spectrum by windowing and FFT the Error
Vector Time data. On this trace, the individual error vectors are plotted vs frequency.
Example
:DISP:DDEM:WIND2:DATA EVSP
Sets the second window data to Error Vector Spectrum
Mag Error
Available for all modulation formats except any FSK type.
This trace shows the magnitude error trace in time domain. This trace is computed
by comparing the magnitude, point by points, of the IQ measured signal with the
magnitude of the IQ reference signal.
Example
:DISP:DDEM:WIND:DATA MERR
Sets the first window data to Mag Error
Phase Error
Available for all modulation formats except any FSK type.
This trace shows the phase error trace in time domain. This trace is computed by
comparing the unwrapped phase, point by points, of the IQ measured signal with the
unwrapped phase of the IQ reference signal.
Example
:DISP:DDEM:WIND:DATA PERR
Sets the first window data to Phase Error
FSK Error Time
Available only when the demodulation format is any FSK type.
This trace shows the time domain error vector trace data results. The trace contains
the computed error vectors between FSK Meas Time and FSK Ref Time at each point
in time. The values of the error vectors are usually plotted as a magnitude.
Example
:DISP:DDEM:WIND2:DATA EVT
Sets the second window data to FSK Error Time
FSK Error Spectrum
Available only when the demodulation format is any FSK type.
221 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)