Keysight Technologies InfiniiVision 3000 X Series, User Manual

Page: 180 / 432

180 Keysight InfiniiVision 3000 X-Series Oscilloscopes User's Guide
11
Trigger Mode/Coupling
To set the trigger holdoff
Trigger holdoff sets the amount of time the oscilloscope waits after a trigger
before re-arming the trigger circuitry.
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.
To set the trigger holdoff:
1 Press the [Mode/Coupling] key.
2 In the Trigger Mode and Coupling Menu, press the Holdoff softkey; then, turn
the Entry knob to increase or decrease the trigger holdoff time.
Trigger Holdoff
Operating Hints
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.
Changing the time base settings does not affect the trigger holdoff time.
With Keysight's MegaZoom technology, you can press [Stop] , then pan and zoom
through the data to find where the waveform repeats. Measure this time using
cursors; then, set the holdoff.
External Trigger Input
The external trigger input can be used as a source in several of the trigger types.
The external trigger BNC input is on the rear panel and is labeled EXT TRIG IN .
200 ns
Oscilloscope triggers here
Holdoff
600 ns