How to ? Trigger on a pulse w idth
Trigger on a pulse width
Use the following procedure to detect and trigger on a pulse that is either wider or n arrower than the
specified range:
1. Push the front-panel Advanced button.
2. In the Trigger control window, open the A Event tab.
3. Select Width from the Trigger Type drop-down list.
4. Specify the trigger source. Click S ource; then select a channel from the drop-down list.
5. To specify
the Polarity of the pulse, click Pos (for positive-going pulses) or Ne g (for negative-going
pulses).
6. To set the
range of pulse widths in units of time, click in the Upper Limit and Lower Limit entry boxes;
then enter values with the multipurpose knobs or pop-up keypad:
Upper Li
mit. This is the maximum valid pulse width the trigger source will look for.
Lower Limit. This is the minimum valid pulse width. The instrument will always force the Lower
Limit t
o be less than or equal to the Upper Limit.
7. In the Pulse Width drop-down list:
Select Inside to trigger on pulses that fall within the specified range.
Select Outside to trigger on pulses that are outside the range.
8. YoucanalsoTriggeronalogic-qualified pulse using the Trigger if Width "Logic" selection. When
the instrument detects that a width trigger condition has occurred, it checks the logical state of two
other available channels and triggers only if their conditions are met. Each channel can have a value
of high (H), low (L), or "don't care" (X). A value is considered high if the channel input voltage is
gre
ater than the specified threshold voltage; a value is c onsidered low if the c hannel input voltage is
less than the specified threshold voltage. Use the "don't care" selection for any channels that will not
be used as part of the pattern.
9. Click in the Level entry box; then use the multipurpose knob, pop-up keypad, or front-panel Level
control to set the trigger level.
10. 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.
646 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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