Agilent Technologies FieldFox N9913A - RF Burst Triggering; Triggering

94 FieldFox User’s Guide
 Then select a multiplier key. Learn about multiplier abbreviations on page 19.
Previous FieldFox versions limited the sweep time / ResBW settings. This
restriction is no longer necessary with release A.06.25.
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 about Zero Span on page 93. Learn more about
FFT on page 91 .
FFT Gating is available for non-zero span measurements. Learn more about FFT
Gating on page 97.
Trigger Type
 Press Sweep 3
 Then Trigger Settings
 Then Trig Type
 Then choose from the following:
o Free Run Triggering is provided by the FieldFox internal circuitry. A new
sweep begins when the previous sweep ends.
o 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).
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.
o 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.
o 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.
Trigger Slope
Trigger Slope determines which edge of an External, Video, or RF Burst trigger
signal initiates a sweep.
 Press Sweep 3
 Then Trigger Settings
 Then Trig Slope
 Then choose from the following:
o Pos Sweep is triggered by the rising (positive) edge of signal.