3 VMA Mode
3.8 ACP Measurement
Example
:ACP:FREQ:SYNT:AUTO 1
:ACP:FREQ:SYNT:AUTO?
Preset
ON
Parameter Options, Installed Options, Auto Rules & Ranges
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.
Parameter Values Summary
Option # Description
"Balanced" on
page 1341
1
–
In instruments with EP0, balances close-in phase noise with spur
avoidance
–
In instruments without EP0 optimizes phase noise for small
frequency offsets from the carrier
"Best Wide-
offset" on page
1341
2 Optimizes phase noise for wide frequency offsets from the carrier
"Fast Tuning"
on page 1342
3 Optimizes LO for tuning speed
"Best Close-in"
on page 1341
4 or 1*
–
In instruments with EP0, emphasizes close-in phase noise
performance without regard to spur avoidance
–
In instruments without EP0, this setting is accepted but no action is
taken
"Best Spurs"
on page 1341
5
–
In instruments with EP0, emphasizes spur avoidance over close-in
phase noise performance
–
In instruments without EP0, this setting is accepted but no action
taken
Auto - Automatically selects LO (local oscillator) phase noise behavior to
optimize dynamic range and speed for various instrument operating
conditions
*Dependent on Option EP0 installation. See "Best Close-in" on page 1341 below.
The actual behavior varies somewhat depending on model number and option; for
example, you always get Fast Tuning by choosing Option #3, but in some models,
"Fast Tuning" on page 1342 is identical in effect to "Best Close-in" on page 1341.
Vector Modulation Analyzer Mode User's &Programmer's Reference 1340
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