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Using The Test Tool
Triggering on a Waveform
1
29
Isolated Triggering
Use the optically isolated trigger probe (ITP120, optional)
to trigger on an external source, and to isolate the test tool
from a trigger waveform. See Figure 1-17.
To choose the isolated trigger probe, select ‘EXT’ in point
f of the previous example. Trigger level is fixed and is
TTL compatible.
Figure 1-17. Isolated Triggering
Triggering on Video Signals
• Apply an interlaced video signal to the red input A.
To trigger on a random video line, continue from point d
of the previous example as follows:
e
Highlight VIDEO on A.
f
Open the VIDEO TRIGGER
submenu.
g
Highlight PAL.
h
Select PAL.
i
Highlight RANDOM.
j
Select RANDOM.
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