Trigger Mode and Conditioning 11
Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide 159
To set the trigger holdoff:
1 Open the Conditioning dialog box by selecting Conditioning... in the Trigger
dialog box or by choosing choose Trigger > Conditioning... from the main menu.
2 In the Conditioning dialog box, select the Holdoff tab.
3 Select the Random check box to enable or disable the random trigger holdoff
mode.
The random trigger holdoff mode ensures that the oscilloscope re-arms after
each acquisition in a manner that minimizes or eliminates the likelihood of
triggering at the beginning of a DDR burst. Randomizing the holdoff time
increases the likelihood that the oscilloscope will trigger on different data
phases of a multi-phase (8 data transfer) burst. This mode mixes up the traffic
pattern the oscilloscope triggers on and is very effective when used on
repeating patterns.
4 If random trigger holdoff is disabled, select the Holdoff field and enter the
trigger holdoff time.
If random trigger holdoff is enabled, select the Min and Max fields and enter the
minimum and maximum trigger holdoff times.
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
markers; 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 labeled AUX TRIG IN.
200 ns
Oscilloscope triggers here
Holdoff
600 ns
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