Triggering on a runt pulse
Use this procedure to set the oscilloscope to trigger when a runt pulse occurs.
You can also trigger when a runt pulse is less than, greater than, equal to, or not
equal to a set time period (width).
A runt pulse is a pulse that crosses one threshold level but fails to cross a second
threshold before recrossing the first. Therefore, a runt trigger needs two threshold
levels to define the two levels that a signal must pass through to be considered a
valid (nonrunt) signal. See Available trigger types on page 44.
Runt pulse triggering is most often used to troubleshoot or analyze digital signals.
The minimum runt pulse width setting is 1 ns.
1. Push the Trigger Menu front-panel button.
2. Push the Type side-menu button.
3. Use the Multipurpose knob to select and click Runt.
4. Push the Source side-menu button and use the Multipurpose knob to select
and click the channel to use as the trigger signal source, or select AC Line to
use the AC power source frequency as the trigger signal.
5. Push the Polarity side-menu button and use the Multipurpose knob to select
and click the runt pulse polarity (positive, negative, or either) to trigger on.
6. Push the Thresholds side-menu button and use the Multipurpose knob to
select and click the trigger levels (thresholds) to use to detect a runt pulse:
■
Click High and use the Multipurpose knob to manually set the level that
defines a valid high signal threshold level.
■
Click Low and use the Multipurpose knob to manually set the level that
defines a valid low signal threshold level.
■
Click Choose Preset and use the Multipurpose knob to set the trigger
threshold levels to predefined signal logic family levels (TTL, CMOS,
ECL, and so on) or to 0.
7. Push the Trigger When side-menu button and use the Multipurpose knob to
select and click Runt Occurs to trigger on any runt event. If triggering on a
Trigger setup
TBS2000B Series Oscilloscopes User Manual 63
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