Keysight Technologies DSO-X 2014A, User Manual

Page: 159 / 378

Triggers
10
Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide 159
To trigger on a specific line of video
Video triggering requires greater than 1/2 division of sync amplitude with any
analog channel as the trigger source. Turning the trigger Level knob in Video
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] 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.