SDS2000X Plus Series Digital Oscilloscope User Manual
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15.7
Holdoff
Holdoff is an additional condition for triggers and can be used to stabilize
the triggering of complex waveforms (such as a pulse series). It can be set
to a time or number of events.
Holdoff by Time
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 achieve a stable trigger on the repetitive pulses shown in
the figure below set the holdoff time (t) to 200 ns < t < 600 ns.
Holdoff by Event
The holdoff event is the number of events that the oscilloscope counts
before re-arming the trigger circuitry. The oscilloscope will not trigger
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