Fluke Biomedical 190M - Manual (Page 77)

Triggering on Waveforms
Triggering on Pulses
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Triggering on Pulses
Use pulse width triggering to isolate and display specific
pulses that you can qualify by time, such as glitches,
missing pulses, bursts or signal dropouts.
Detecting Narrow Pulses
To set the test tool to trigger on narrow positive pulses
shorter than 5 ms, do the following:
1 Apply a video signal to the red input A.
2
TRIGGER
Display the TRIGGER key labels.
3
F4
Open the TRIGGER OPTIONS menu.
4
ENTER
Select Pulse Width on A... to open
the trigger on pulse width menu.
5
ENTER
Select the positive pulse icon,
then jump to Condition.
6
ENTER
Select <t, then jump to Update.
7
ENTER
Select On Trigger.
The test tool is now prepared to trigger on narrow pulses
only. Observe that the trigger key labels at the bottom of
the screen have been adapted to set the pulse conditions:
To set the pulse width to 5 ms, do the following:
8
F1
Enable the arrow keys to adjust
the pulse width.
9 Select 5 ms.
All narrow positive pulses shorter than 5 ms are now
displayed on the screen. (See Figure 33).