The trigger event
The trigger event establishes the time-zero point in the waveform record. All waveform record data are located in time with
respect to that point. The instrument continuously acquires and retains enough sample points to fill the pretrigger portion of the
waveform record (that part of the waveform that is displayed before, or to the left of, the triggering event on screen).
When a trigger event occurs, the instrument starts acquiring samples to build the posttrigger portion of the waveform record
(displayed after, or to the right of, the trigger event). Once a trigger is recognized, the instrument will not accept another trigger
until the acquisition is complete and the holdoff time has expired.
Trigger on a pulse width event
Pulse-width triggering triggers the oscilloscope when a signal pulse width is less than, greater than, equal to, or not equal to a
specified pulse width. This trigger is useful for digital logic troubleshooting.
To set a pulse width trigger:
1. Double-tap the Trigger badge to open the Trigger configuration menu.
2. Tap Trigger Type and select Pulse Width.
3. Tap Source and select the trigger source.
4. Tap Trigger When and select the pulse width condition on which to trigger (> Limit, < Limit, = Limit, ≠Limit, Outside Range,
Inside Range).
5. Set the pulse width time constraints:
a. For all trigger when conditions except Outside Range or Inside Range, tap the Time Limit field and use the assigned
multipurpose knob to set the pulse width time condition to meet.
b. For Outside Range or Inside Range conditions, tap the High Time Limit and High Time Limit fields and use the
assigned multipurpose knobs to set the pulse width time range condition to meet.
6. Tap the Level field and set the threshold value at which you want to measure pulse width.
7. Select the pulse polarity on which to trigger.
8. To further refine the trigger conditions, set Logic Qualification to On and tap the Define inputs button to define the logic
condition of any other signals that must be true at the same time as the pulse width trigger event is true.
Advanced triggering
118 MSO54, MSO56, MSO58, MSO58LP, MSO64 Help
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