angle is in the II and III quadrants, that is, within the range of (π / 2 - π) or (π -
3π /2).
Example 6: Video Signal Trigger
Observe the video circuit of a television, apply the video trigger and obtain the
stable video output signal display.
Video Field Trigger
For the trigger in the video field, carry out operations according to the following
steps:
(1) Push the Trigger Menu button to display the trigger menu.
(2) Select the first menu item in the bottom menu. Select Single in the right
menu.
(3) In the left menu, select Video as the mode.
(4) Select Source in the bottom menu. Select CH1 in the right menu.
(5) Select Modu in the bottom menu. Select NTSC in the right menu.
(6) Select Sync in the bottom menu. Select Field in the right menu.
(7) Turn the Vertical Scale, Vertical Position and Horizontal Scale knobs to
obtain a proper waveform display (see Figure 8-7).
Figure 8-7 Waveform Captured from Video Field Trigger
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