Triggering - Keysight N9912A User Manual

Triggering

External and Video triggering allows you to start a FieldFox sweep which is initiated
by an external event such as a signal burst.
External and Video triggering can be used in either Zero Span (time domain) or
frequency span measurements. However, Video triggering in frequency domain
sweeps is limited to cases where Res BW is less than or equal to 200 kHz.
FFT Gating is available for non-zero span measurements. Learn more about FFT
Gating at:
NOTE The following Trigger Settings are available ONLY when performing an FFT sweep or
when in Zero Span. Learn more about FFT on page 82 . Learn more about Zero Span
on page 83.
Trigger Type
 Press Sweep 3
 Then
 Then
 Then choose from the following:
Trigger Slope
Trigger Slope determines which edge of an External or Video trigger signal initiates a
sweep.
 Press Sweep 3
 Then
 Then
 Then choose from the following:
Trigger Delay
After a valid External or Video trigger signal is received, the sweep begins after the
specified Trigger Delay time. Only positive values are allowed.
To see the rising edge of a repetitive signal which is triggered on that edge, use
trigger delay to clearly view the subsequent signal one period later.
 Press Sweep 3
SA (Spectrum Analyzer) Mode
www.keysight.com/find/fieldsfoxsupportFieldFox.htm
Trigger Settings
Trig Type
Triggering is provided by the FieldFox internal circuitry. A new sweep
Free Run
o
begins when the previous sweep ends.
A sweep is triggered on an external TTL signal at the EXT TRIG/EXT
External
o
REF BNC 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).
A sweep is triggered on a signal at the RF IN connector when the
Video
o
amplitude of the incoming signal exceeds the settable Trigger Level. In
frequency domain sweeps, Res BW must be set to 200 kHz or less. This setting
is called Video trigger because the signal that initiates the trigger appears on
the display.
Trigger Settings
Trig Slope
Sweep is triggered by the rising (positive) edge of signal.
Pos
o
Sweep is triggered by the falling (negative) edge of signal.
Neg
o
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