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SDS1000X-E User Manual
61
WWW.SIGLENT.COM
Note
: adjust the time scale and horizontal position will not affect the holdoff time.
Trigger Holdoff
Trigger holdoff can be used to stably trigger the complex waveforms (such as pulse
series). 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 holdoff option. The holdoff time of the oscilloscope is
adjustable from 100ns 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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