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Verfügbare Sprachen
Verfügbare Sprachen
Based on the expression sin =A/B or C/D, where, 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- π /2) or (3π /
2- 2π). If the principal 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 - 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.
Press the TRIG MENU button to display the trigger menu.
Press the F1 menu selection button and choose Single for Type.
2.
3.
Press the F2 menu selection button and choose CH1 for Source.
4.
Press the F3 menu selection button and choose Video for type.
Press the F4 menu selection button and choose Field for Sync.
5.
6.
Adjust the VOLTS/DIV, VERTICAL POSITION and SEC/DIV knobs to obtain a proper wave form display
(see Fig.110).
Video Line Trigger
For the trigger in the video line, please operate according to the following steps:
1.
Push down the TRIG MENU button to display the trigger menu.
2.
Press the F1 menu selection button and choose Single for Type.
Press the F2 menu selection button and choose CH1 for Source.
3.
4.
Press the F3 menu selection button and choose Video for mode.
5.
Press the F4 menu selection button and choose Line for Sync.
Adjust the VOLTS/DIV, VERTICAL POSITION and SEC/DIV knobs to obtain the proper wave form
6.
display (see Fig. 111).
Fig. 110 Wave Form Obtained from Video Field Trigger
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