152 Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide11 Trigger Mode/CouplingTo set the trigger holdoffTrigger holdoff sets the amount of time the oscilloscope waits after a triggerbefore re-arming the trigger circuitry.Use the holdoff to trigger on repetitive waveforms that have multiple edges (orother events) between waveform repetitions. You can also use holdoff to trigger onthe 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, setthe 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, turnthe Entry knob to increase or decrease the trigger holdoff time.Trigger HoldoffOperating HintsThe correct holdoff setting is typically slightly less than one repetition of thewaveform. Set the holdoff to this time to generate a unique trigger point for arepetitive 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 zoomthrough the data to find where the waveform repeats. Measure this time usingcursors; then, set the holdoff.External Trigger InputThe 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 nsOscilloscope triggers hereHoldoff600 ns
