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Triggering on a Video Signal
Use this procedure to detect and trigger on a video signal. Only composite signal formats are
supported. Graphic display formats such as RGB and VGA are not supported.
Select video triggering
1. Push the front-panel ADVANCED button.
2. On the Trigger Setup control window, select the A Event
tab.
3. Click Video.
Select the source
4. To specify which channel becomes the trigger source,
click Source, and select the source from the list.
Select the format
5. Select the video signal format from several preset formats,
or set a custom format. If using a preset format, click the
Lines and Fields Autoset buttons to optimize the instrument
for viewing the fields or lines for your chosen format.
If you select the Custom signal format, no Autoset options
are available. You must set the Scan Type (Interlaced or
Progressive) and Scan Rate.
Custom scan rates enable you to trigger on non-broadcast video
signals that have unique scan rates. Select the scan rate that
includes your signal: 15–20 kHz, 20–25 kHz, 25–35 kHz, 35–50
kHz, or 50–65 kHz.
Specify where trigger will
occur on the video signal
6. Select a value from the Trigger On drop-down list to specify
where the trigger will occur on the video signal:
 If you select Field, use the drop-down list to select
either Odd, Even, or All.
 If you select Line #, use the multipurpose knob to set
the line number. Line numbers wrap when their limits
are reached. The range of line numbers depends on the
format.
 If you select the NTSC format, use the multipurpose
knob to first scroll through all of the odd lines, then the
even lines.
 If you select All Lines, the trigger will occur on any and
all lines.
Set the holdoff type
7. Specify Holdoff By Time or By Fields, and use the
multipurpose knob to change the value. If setting a
Custom format, only the By Time control is available.
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