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Concepts
Trigger Concepts
Trigger Concepts
NOTE The trigger functions let you select the trigger settings for a sweep or measurement.
When using a trigger source other than Free Run, the analyzer will begin a sweep
only with the selected trigger conditions are met. A trigger event is defined as the
point at which your trigger source signal meets the specified trigger level and
polarity requirements (if any). In FFT measurements, the trigger controls when the
data is acquired for FFT conversion.
Selecting a trigger
1. Free Run Triggering
Pressing this key, when it is not selected, selects free-run triggering. Free run
triggering occurs immediately after the sweep/measurement is initiated.
Press Trigger, Free Run
2. Video Triggering
The Video trigger condition is met when the video signal (the filtered and
detected version of the input signal, including both RBW and VBW filtering)
crosses the video trigger level. Video triggering triggers the measurement at the
point at which the rising signal crosses the video trigger horizontal green line on
the display:
Press Trigger, Video, Video, Trigger Level, −30, dBm. (If Video trigger has not
already been selected, you need to press Video a second time to get to the Trigger
Level function.)
3. External Triggering
In the event that you have an external trigger available that can be used to
synchronize with the burst of interest, connect the trigger signal to the rear of the
analyzer using either the Trigger 1 In or Trigger 2 In input connector. It
might be necessary to adjust the trigger level by rotating the front panel knob or
by entering the numeric value on the keypad.
Press Trigger, External 1 or External 2, Trigger Level, and adjust as necessary.
4. RF Burst Wideband Triggering
RF burst triggering occurs in the IF circuitry chain, as opposed to after the video
detection circuitry with video triggering. In the event video triggering is used, the
detection filters are limited to the maximum width of the resolution bandwidth
filters. Set the analyzer in RF burst trigger mode.
Press Trigger, RF Burst.
5. Line Triggering
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