Triggering the Oscilloscope 4
6000 Series Oscilloscope User’s Guide 189
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.
Figure 15 Example: Triggering on Line 136
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.
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