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SDS2000X HD Series Digital Oscilloscope User Manual
1 0 6 i n t . s i g l e n t . c o m
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 200ns<t<600ns.
Holdoff by Event
The Holdoff event sets the number of events that the oscilloscope counts before re-arming the trigger
circuitry. The oscilloscope will not trigger until the counter that tracks holdoff events reaches the set
value. In the following figure, the holdoff event is set to 3, and the signal is triggered on the fourth
edge.
Parameter Start Holdoff On defines the initial position of holdoff.
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