311
Triggering on Pulse Timeout
Use this procedure to detect and trigger on pulses longer than a specified time. The instrument will
trigger at the end of the timeout period.
Select timeout triggering
1. Push the front-panel ADVANCED button.
2. On the Trigger Setup control window, select the A Event
tab.
3. Click Timeout.
Select the source
4. To specify which channel becomes the trigger source,
click Source and select the source from the list
Set the level
5. To set the trigger timeout level, click Level and use the
multipurpose knobs or pop-up keypad to enter the voltage
level.
You can set the level to a value appropriate to either the TTL or
ECL logic families by clicking TTL or ECL on the Level pop-up
keypad.
Set the timer
6. To set the timeout timer, click Timer and use the
multipurpose knob or pop-up keyboard to set the time.
Set the pulse threshold
7. To set the pulse threshold, click:
 Stay High to trigger if the signal stays higher than the
trigger level for longer than the timeout (Timer) value.
 Stay Low to trigger if the signal stays lower than the trigger
level for longer than the timeout (Timer) value.
 Either to trigger if the signal stays lower or stays higher
than the trigger level for longer than the timeout (Timer)
value.
Set mode and holdoff
8. Mode and holdoff can be set for all standard trigger types.
Refer to trigger mode on page 137 and Set holdoff on page
122 to learn more about trigger mode and holdoff.
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