Keysight Technologies DSO-X 2002A, User Manual

Page: 139 / 352

Triggers
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Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide 139
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] key.
2 In the Trigger Menu, press the Trigger softkey; then, turn the Entry knob to
select Video .
3 Press the Settings softkey, then press the Standard softkey to select the
appropriate TV standard (NTSC).
4 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 .
5 Press the Line # softkey and select the number of the line you want to examine.
NOTE
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.
Figure 15 Example: Triggering on Line 136