Keysight x-series User Manual

3 Spectrum Analyzer Mode
3.3 Channel Power Measurement
In this mode, the LO behavior compromises phase noise at many offsets from the
carrier in order to allow rapid measurement throughput when changing the center
frequency or span. The term "Fast Tuning" on page 668 refers to the time it takes to
move the local oscillator to the start frequency and begin a sweep; this setting does
not impact the actual sweep time in any way.
In instruments with EP1, the LO behavior compromises phase noise at offsets below
4 MHz in order to improve measurement throughput. The throughput is especially
affected when moving the LO more than 2.5 MHz and up to 10 MHz from the stop
frequency to the next start frequency.
In instruments with Option EP0, this is the same configuration as "Best Spurs" on
page 668. It is available with the "Fast Tuning" on page 668 label for convenience,
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 668
option, the settings for "Best Close-in" on page 667 are used if "Fast Tuning" on
page 668 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 668
Span > 114.1 MHz, or
RBW > 800 kHz
"Fast Tuning" on
page 668
RBW > 290 kHz, or
Span > 4.2 MHz
"Best Wide-
offset" on page
668
Other conditions "Balanced" on
page 668
EP1
Models with option EP1 have a two-
Span > 44.44 MHz, or
RBW > 1.9 MHz, or
"Fast Tuning" on
page 668
Spectrum Analyzer Mode User's &Programmer's Reference 669

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)