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Holdoff
Trigger holdoff can be used to stably trigger complex waveforms (such as a series
of pulses). 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 on repetitive waveforms that have 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 shown 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 a holdoff option.
The holdoff time of the oscilloscope is adjustable from 80ns to 1.5s.
1. Press the Stop button, and then use the Horizontal Position Knob and the
Horizontal Scale Knob to find where the waveform repeats. Measure this time
using cursors; then, set the holdoff.
2. Press the Setup button on the front panel to enter the TRIGGER function menu.
The default trigger type is edge.
3. Press the Holdoff Close softkey; and then turn the Universal Knob to set the
desired holdoff time.
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