TDS310 datasheet(80/242 Pages) ETC2

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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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