To Trigger On A Specific Line Of Video - Agilent Technologies InfiniiVision 5000 Series User Manual

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Triggering

To trigger on a specific line of video

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TV triggering requires greater than 1/2 division of sync amplitude with any analog
channel as the trigger source. Turning the trigger Level knob in TV trigger does not
change the trigger level because the trigger level is automatically set to the sync pulse
tips.
One example of triggering on a specific line of video is looking at the vertical interval test
signals (VITS), which are typically in line 18. Another example is closed captioning, which
is typically in line 21.
1 Press the Trigger [More] key, then press the TV softkey.
2 Press the Settings softkey, then press the Standard softkey to select the appropriate
TV standard (NTSC).
3 Press the Mode softkey and select the TV field of the line you want to trigger on. You
can choose Line:Field1, Line:Field2, or Line:Alternate.
4 Press the Line # softkey and select the number of the line you want to examine.
Alternate Triggering
If Line:Alternate is selected, the oscilloscope will alternately trigger on the selected line number
in Field 1 and Field 2. This is a quick way to compare the Field 1 VITS and Field 2 VITS or to check
for the correct insertion of the half line at the end of Field 1.
E : T
XAMPLE RIGGERING ON
L 136
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InfiniiVision Oscilloscopes User's Guide