3 VMA Mode
3.5 Channel Power Measurement
and to make the user interface more consistent with other X-Series instrument
family members.
(In models whose hardware does not provide for a "Fast Tuning" on page 890 option,
the settings for "Best Close-in" on page 889 are used if "Fast Tuning" on page 890 is
selected. This gives the fastest possible tuning for that hardware set.)
Auto
:FREQ:SYNT:AUTO ON
Selects the LO (local oscillator) phase noise behavior to optimize dynamic range and
speed for various instrument operating conditions. The selection rules are as
follows.
Auto Optimization Rules
X-Series instruments have several grades of LO, offering different configurations
when in the Auto Mode. The rules for Auto selection are as follows:
Models with Option Conditions Selection
EP0
Models with option EP0 have a two
stage local oscillator, which switches
to a single loop for fast tuning
(available in UXA)
Center frequency is < 699.9 kHz "Balanced" on
page 889
Span > 114.1 MHz, or
RBW > 800 kHz
"Fast Tuning" on
page 890
RBW > 290 kHz, or
Span > 4.2 MHz
"Best Wide-
offset" on page
890
Other conditions "Balanced" on
page 889
EP1
Models with option EP1 have a two-
loop local oscillator, which switches to
a single loop for fast tuning
(available in PXA)
Span > 44.44 MHz, or
RBW > 1.9 MHz, or
Source Mode is set to “Tracking”
"Fast Tuning" on
page 890
Center frequency is < 195 kHz, or
CF >= 1 MHz and Span <= 1.3 MHz
and RBW <= 75 kHz
"Best Close-in"
on page 889
All other conditions "Best Wide-
offset" on page
890
EP2
Models with option EP2 use a different
loop bandwidth for the fast-tuning
choice, which is a compromise
CF < 130 kHz , or
CF > 12 MHz and Span < 495 kHz and
RBW < 40 kHz
"Best Close-in"
on page 889
891 Vector Modulation Analyzer Mode User's &Programmer's Reference
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