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SDS5000X Series Digital Oscilloscope User Manual
105 / 236 W W W. S I G L E N T. C O M
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 200ns<t<600ns.
Holdoff by Event
Holdoff event is the amount of events that the oscilloscope counts before re-
arming the trigger circuitry. The oscilloscope will not trigger until the counter
tracking 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.
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