Example 6: Video Signal Trigger - Promax OD-603 Manual

Based on the expression sin (q) = A/B or C/D, there into, q is the phase
difference angle, and the definitions of A, B, C, and D are shown as the graph
above. As a result, the phase difference angle can be obtained, namely, q = ±
arcsin (A/B) or ± arcsin (C/D). If the principal axis of the ellipse is in the I
and III quadrants, the determined phase difference angel should be in the I and
IV quadrants, that is, in the range of (0 ~
axis of the ellipse is in the II and IV quadrants, the determined phase difference
angle is in the II and III quadrants, that is, within the range of (
π
/2).
~3
5.6

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:
Press the Trigger Menu button to display the trigger menu.
Press the H1 button to display the trigger type menu.
Press the F1 button to choose Single for Type.
Turn the M knob to choose Video as the mode.
Press the H2 button to display the Source menu.
Press the F1 button to choose CH1 for Source.
Press the H3 button to display the Modu menu.
Press the F1 button to choose NTSC for the modulation.
Press the H4 button to display the sync menu.
Press the F2 button to choose Field for Sync.
Turn the VOLTS/DIV, VERTICAL POSITION and SEC/DIV knobs to
obtain a proper waveform display (see Figure 86).
June 2016
π π
/2) or (3 / 2 ~2
π
). If the principal
π π π
/ 2 ~ ) or (
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