To Trigger On A Specific Line Of Video - HP 54600 Series User's And Service Manual

To trigger on a specific line of video

TV triggering requires greater than 1/4 division of sync amplitude, either
channel 1 or channel 2 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.
Select the TV display, TV as the trigger mode, and the appropriate
1
TV standard.
Press
2
Slope/Coupling
panel, then press the
number of the line you want to examine by pressing the
Line softkey or by rotating the knob closest to the
Press the Trigger On softkey to select the TV field of the line you want
3
to trigger on. Your choices are
fields).
Alternate triggering
If Alt Fld 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.
When using GENERIC as the TV standard, the Trigger On softkey gives you the
choices of Field 1, Field 2 and Vertical.
Using Option 005 Enhanced TV/Video Trigger (HP 54602B)
To trigger on a specific line of video
in the section of the front
TRIGGER
Mode softkey until Line
,
Field 1 Field 2
appears. Select the
Trigger On
key.
Cursors
, and (alternate
Alt Fld
3–5