Agilent Technologies 54657A Especificações Página 77

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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.
1
Select the TV display, TV as the trigger mode, and the appropriate
TV standard.
2 Press Slope/Coupling in the TRIGGER section of the front
panel, then press the
Mode softkey until Line appears. Select the
number of the line you want to examine by pressing the
Trigger On
Line
softkey or by rotating the knob closest to the Cursors key.
3 Press the Trigger On softkey to select the TV field of the line you want
to trigger on. Your choices are
Field 1, Field 2, and Alt Fld (alternate
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
To trigger on a specific line of video
3–5
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