Trigger Mode/Coupling 12
Keysight InfiniiVision 1200 X-Series and EDUX1052A/G Oscilloscopes User's Guide 127
2 In the Trigger 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.
On 4-channel oscilloscopes, the external trigger BNC input is on the rear panel
and is labeled EXT TRIG.
On 2-channel oscilloscopes, the external trigger BNC input is on the front panel
and is labeled Ext Trig.
The external trigger input impedance is 1M Ohm. This lets you use passive probes
for general-purpose measurements. The higher impedance minimizes the loading
effect of the oscilloscope on the device under test.
To set the external trigger input options:
1 Access the External Trigger menu:
• On 4-channel oscilloscopes:
i Press the [Trigger] key in the Trigger section of the front panel.
ii In the Trigger menu, press the External softkey.
• On 2-channel oscilloscopes, press the [External] key in the Vertical section of
the front panel.
Maximum voltage at oscilloscope external trigger input
30 Vrms, 40 Vpk
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