Keysight x-series Programmer's Reference

3 VMA Mode
3.1 Digital Demod Measurement
Turned Off and grayed-out when the IF Path is set to a path other than 1 GHz. If you press the grayed-
out control, a warning message “LO Dither only available with IF Path 1 GHz” is shown. If you try to set
LO Dither to ON remotely while it is grayed-out, a message “-221,Settings conflict; LO Dither only
available with IF Path 1 GHz" is returned
When LO Dither is turned on, the Phase Noise Optimization control is grayed-out. If you try to change
the PNO value via the front panel or SCPI in that case, an error is generated, “LO Dither must be
turned off to change this value"
Couplings As with most parameters with an AUTO state, AUTO COUPLE sets it to Auto, which then selects
AUTOrange. Setting any specific value (AUTOrange, LOW or HIGH) will set the AUTO state to false
When LO Dither is turned ON, Phase Noise Optimization is set to “Best Close-In”. If the Phase Noise
Optimization value changes due to turning on LO Dither, a warning message “Phase Noise
Optimization changed due to LO Dither activation” is shown
Preset
OFF
State Saved Saved in instrument state
PhNoise Opt
Selects the LO (local oscillator) phase noise behavior for various desired operating
conditions.
For full details, see "Parameter Options, Installed Options & Auto Rules" on page 365
and "Ranges" on page 370 below.
Remote Command
[:SENSe]:DDEMod:FREQuency:SYNThesis[:STATe] 1 | … | 5
For the meaning of each numeric option value, see "Parameter Options, Installed Options & Auto
Rules" on page 365 below
[:SENSe]:DDEMod:FREQuency:SYNThesis[:STATe]?
Example
:DDEM:FREQ:SYNT 2
Selects optimization for best wide offset phase noise
Dependencies Does not appear in all models. The control is blank in those models, but the SCPI command is
accepted for compatibility (although no action is taken)
Preset 2
State Saved Yes
Range See "Ranges" on page 370 below
Parameter Options, Installed Options & Auto Rules
The Phase Noise Optimization control lets you optimize the setup and behavior of
the Local Oscillator (LO) depending on your specific measurement conditions. You
may wish to trade off noise and speed, for example, to make a measurement faster
without regard to noise or with optimum noise characteristics without regard to
speed.
365 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)