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Follow up below steps to set CH1 as video trigger
1.
Press "Trig menu"
2.
Press F1 to choose type as "Single"
3.
Press F2 to choose source as "CH1".
4.
Press F3 to choose mode as "Video".
5.
Press F4 to choose synchronization as "Line" (refer to Fig.41)
6.
Press F5 to Next menu.
7.
Press F2 to choose modulation as "NTSC".
28.2.3. Pulse Width Trigger
Pulse trigger occurs according to the width of pulse. The abnormal signals can be detected through setting up
the pulse width condition.
The Pulse Width Trigger Menu is shown as Fig. 42.
Fig. 41 Video field trigger Oscillogram
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