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ScopeMeter
®
Test Tool
Waveform Triggers
49
Pulse Triggers
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.
Narrow Pulses
To set the test tool to trigger on narrow positive pulses shorter than 5 ms:
1. Apply a video signal to the red input A.
2. Press
T to show the TRIGGER key labels.
3. Press 4 to open the TRIGGER OPTIONS menu.
4. Use the cursor and E select Pulse Width on A to open the trigger on pulse width menu.
5. Use the cursor and E to select the negative pulse icon and jump to Condition.
6. Use the cursor and E to select <t and jump to Update.
7. Use the cursor and E to 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 100 μs:
8. Press 1 to enable the cursor to adjust the pulse width.
9. Use
h i
to select 100 μs.
All narrow positive pulses less than 100 μs show on the screen. See Figure 29.
Note
The test tool stores all triggered screens in the replay memory. For example, if you setup
the trigger for glitches, you can capture 100 glitches with time stamps. Use the REPLAY
key to look at all the stored glitches.
Figure 29. Trigger on Narrow Glitches
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