Keysight Technologies FieldFox A Series, User Manual

Page: 172 / 756

172 Keysight N9927-90001 User’s Guide
SA (Spectrum Analyzer) Mode
SA Mode Settings
Previous FieldFox versions limited the sweep time / ResBW settings. This
restriction is no longer necessary with release A.06.25.
Learn more about SA mode Sweep Time in the Supplemental Online Help:
http://na.support.keysight.com/fieldfox/help/SupHelp/FieldFox.htm
Triggering
External, Video, and RF Burst triggering allows you to initiate an SA mode
sweep using an external event such as a signal burst.
All three trigger types can be used in either Zero Span (time domain) or FFT
frequency sweeps. Learn more in “Zero Span Measurements” on page 170 .
Learn more in “Sweep Type” on page 166 .
FFT Gating is available for non-zero span measurements. Learn more about
FFT Gating in “FFT Gating (Opt 238)” on page 175 .
Trigger Type
— Press Sweep 3
— Then Trigger Settings
— Then Trig Type
— Then choose from the following:
— Free Run Triggering is provided by the FieldFox internal circuitry. A
new sweep begins when the previous sweep ends.
— External A sweep is triggered on an external TTL signal at the Ref
In/Trig In connector on the FieldFox top panel. Choose to trigger on
the rising slope at about 1.7 V or on the falling slope at about 1.0 V
using the Trigger Slope setting (below).
— Periodic sets a trigger that repeats at the period rate entered. Periodic
trigger's phase can be altered by the Offset value.
The following two selections are similar in that they both a trigger a sweep
from a signal at the SA RF Input connector. Experiment with both selections to
find the best trigger type for your application.
— Video A sweep is initiated when the displayed amplitude of an incoming
signal crosses the settable Trigger Level. This selection can detect
low-amplitude signals, but also has been filtered considerably and may not
be a true representation of the incoming signal.
— RF Burst A sweep is initiated when the signal at the third IF (analog) stage
crosses the settable Trigger Level. This selection offers a wider bandwidth
and may be a better representation of the incoming signal than Video
trigger. However, RF Burst is not as sensitive to triggering on low-level
signals.