Howto? Triggeronapulsetimeout
Trigger on a pulse timeout
Use the following procedure to detect and trigger on pulses longer than a specified time. The instrument
will trigger at the end of the timeout period.
1. Push the front-panel Advanced button.
2. In the Trigger control window, Open the A Event tab.
3. Select Timeout from the Trigger Type drop-down list.
4. Specify the trigger source. Click Source; then select a channel from the drop-down list.
5. To set the t
rigger timeout level, click in the Level entry box; then use the multipurpose knob or
pop-up keypad to enter the voltage level.
NOTE. 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.
6. To set the timeout timer, click Timer, and then use the multipurpose knob or pop-up keypad to set the
time.
7. To set the pulse threshold, click one of the following:
Stay High. Triggers if the signal stays higher than the trigger level for longer than t he timeout
(Timer) v alue.
Stay Low. Triggers if the signal stays lower than the trigger level for longer than the timeout
(Timer) v alue.
Either. Triggers if the signal stays lower or stays higher than the trigger level for longer than
the timeout (Timer) value.
8. You can also Trigger on a logic-qualified pulse using the Trigger if Timeout "Logic" selection. When
the instrument detects that a timeout condition has occurred, it checks the logical s tate of two other
available channels and triggers only if their conditions are met. Each channel c an have a value of high
(H), low (L), or "don't care" (X). A value is considered high if the channel input voltage is greater
than the specified threshold voltage; a value is considered low if the channel input voltage is less
t
han the specified threshold voltage. Use the "don't care" selection for any channels that will not be
used as part of the pattern.
9. You can set the mode and holdoff for all standard trigger types. Refer to trigger mode
(see page 389)
and set holdoff (see page 474) to learn more about trigger mode and holdoff.
DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series 647
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