Keysight x-series Instruction Manual

3 Short-Range Comms & IoT Mode
3.2 Modulation Analysis Measurement
The actual frequency offset beyond which noise is optimized is shown with in square
brackets, as this can vary depending on the hardware set in use. For example, in
some analyzers this annotation appears as [offset >30 kHz]
In instruments with Option EP0, the LO is configured for the best possible phase
noise at offsets up to 600 kHz from the carrier whenever there are no significant
spurs within the span observed with an on-screen carrier. When there will be such a
spur, the LO is reconfigured in a way that allows the phase noise to increase by 7 dB
mostly within ±1 octave around 400 kHz offset. The spurs will always be below −70
dBc.
Fast Tuning
Example
:SPEC:FREQ:SYNT 3
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” 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 the Best Spurs
configuration. It is available with this “Fast Tuning” label to inform the user, and to
make the user interface more consistent with other X-Series analyzer family
members.
(In models whose hardware does not provide for a fast tuning option, the settings for
Best Close-in Φ Noise are used if Fast Tuning is selected. This gives the fastest
possible tuning for that hardware set.)
Balance Noise and Spurs
Example
:SPEC:FREQ:SYNT 4
In instruments with EP0, the LO is configured for the best possible phase noise at
offsets up to 600 kHz from the carrier whenever there are no significant spurs within
the span observed with an on-screen carrier. When there will be such a spur, the LO
is reconfigured in a way that allows the phase noise to increase by 7 dB mostly
within ±1 octave around 400 kHz offset. The spurs will always be below −70 dBc.
This setting is never selected when Phase Noise Optimization is in Auto, you must
select it manually.
292 Short Range Comms & IoT 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)