Aegis OSC-9200, User Manual

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Trigger Holdoff
Trigger holdoff can be used to stably trigger complex waveforms (such as pulse series). The holdoff
time is the amount of time that the oscilloscope waits before re-arming the trigger circuitry. The
oscilloscope will not trigger until the holdoff time expires.
Use the holdoff to trigger repetitive waveforms with multiple edges (or other events) between
waveform repetitions. You can also use holdoff to trigger on the first edge of a burst when you know
the minimum time between bursts.
For example, to get a stable trigger on the repetitive pulse burst below, set the holdoff time to be >200
ns but <600 ns.
The correct holdoff setting is typically slightly less than one repetition of the waveform. Set the
holdoff to this time to generate a unique trigger point for a repetitive waveform. Only edge trigger
and serial trigger have the holdoff option. The holdoff time of the oscilloscope is adjustable from
80ns to 1.5s.
1.
Press Stop , and then use the Horizontal Position button and the Horizontal Scale button to
find where the waveform repeats. Measure this time using cursors; then, set the holdoff.
2. Press Trigger Setup to enter the TRIGGER function menu. The default trigger type is edge.
3. Press the Holdoff Close F key; and then turn the Universal Knob to set the desired holdoff time.