Triggering
Operation
328
The video trigger triggers on field 1, field 2, any field, or lines of an NTSC or
PAL standard video signal. It can also trigger on nonstandard video signals
with similar sync signals. You can access video trigger settings through the
video trigger menu, shown in Figure 315.
Figure 315:The Video Trigger Menu
Use the video trigger menu to perform these tasks.
SelectTrigger Source, Mode, and Holdoff
These main menu selec
tions perform exactly as in the edge trigger menu, because the two triggers
share these parameters. For example, if you set the edge trigger holdoff to
2.3 ms and then switch to the video trigger, its holdoff will also be 2.3 ms.
SelectTrigger Point Press the main menu button Trigger On to select
the part of the video signal on which the oscilloscope will trigger. Use the side
menu to select from these options.
H Press Field 1 to trigger on field 1 of the video signal.
H Press Field 2 to trigger on field 2 of the video signal.
H Press Any Field to trigger on any field of the video signal.
H Press Lines to trigger on all lines of the video signal.
The video trigger can only trigger on negativegoing sync. If you need to
trigger on the positivegoing sync of a signal, simply invert the signal from the
verticalmenu (see page 318).
Video Triggering
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