Triggering on a specified pulse width
Use this procedure to set the oscilloscope to trigger on a specified signal pulse
condition. You can trigger when a pulse is less than, greater than, equal to, or not
equal to a set time period (width). The minimum pulse width setting is 1 ns. See
Available trigger types on page 44.
Pulse width triggering is most often used to troubleshoot or analyze digital
signals.
1. Push the Trigger Menu front-panel button.
2. Push the Type side-menu button.
3. Use the Multipurpose knob to select and click Pulse Width.
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 pulse polarity (positive or negative) to trigger on.
6. Push the Threshold side-menu button and use the Multipurpose knob to
select and click the trigger level entry method:
■
Click the threshold field and use the Multipurpose knob to manually set
the trigger level.
■
Click Choose Preset and use the Multipurpose knob to set the trigger
level to a predefined signal logic family level (TTL, CMOS, ECL, and so
on) or to 0.
■
Click Set to 50% to set the trigger level to 50% of the signal peak-to-
peak level.
7. Push the Trigger When side-menu button and use the Multipurpose knob to
select and click the pulse width condition on which to trigger. Then use the
Multipurpose knob to enter the pulse width time parameter.
Trigger setup
62 TBS2000B Series Oscilloscopes User Manual
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