QC1936 Digital Storage Oscilloscope 62
3.7 Example 7: Triggering on Video Signal
Assume that you are monitoring the video signals of a television to see if they are input normally,
and the video signal is of an NTSC system. You can get a stable display by using the video trigger.
Triggering on Video Fields
To trigger on the video fields, follow the steps below.
1. Push the TRIG MENU button to see the Trigger menu.
2. Push F1 to select Video for the Type option.
3. Push the Source option button to select CH1; push the Polarity option button to select Normal;
push the Standard option button to select NTSC.
4. Push the Sync option button to select Odd Field, Even Field or All Fields.
5. Turn the Trigger Level knob to adjust the trigger level and stabilize video signals.
6. Turn the horizontal SEC/DIV and the Vertical Position knobs to display on the screen a
complete video signal triggering on a video field.
The figure below shows a stable signal triggering on a video field.
Triggering on Video Lines
To trigger on the video lines, follow the steps below.
1. Push the TRIG MENU button to see the Trigger menu.
2. Push F1 to select Video for the Type option.
3. Push the Source option button to select CH1; push the Polarity option button to select Normal;
push the Standard option button to select NTSC; push the Sync option button to select Line
Number.
4. Turn the Trigger Level knob to adjust the trigger level and stabilize video signals.
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