312
Triggering on a Pattern
Use this procedure to trigger the instrument when the logic inputs cause the selected function to
become True or False. You can also specify that the logic conditions must be satisfied for a
specific amount of time before the instrument triggers.
Select pattern triggering
1. Push the front-panel ADVANCED button.
2. On the Trigger Setup control window, select the A Event
tab.
3. Click Pattern.
Define pattern inputs
4. Select an input value from the drop-down list for each
channel. The channel inputs combine to form a logic
pattern. 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 greater than the specified
threshold voltage; a value is considered low if the channel
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.
Set threshold voltages
5. To set the threshold voltages, click on the channel
threshold control, and use the multipurpose knobs or pop-
up keypad to set each threshold.
Select logic pattern
6. Select the Boolean logic function for the combination of
input channels. The instrument will trigger on a clock edge
when the input waveforms match the specified logic pattern.
See Pattern Triggers on page 241 for definitions of the logic
functions for pattern triggers.
Set trigger criteria
7. From the Trigger When Pattern list, select True to trigger
the instrument when the logic patterns are true. Select False
to trigger the instrument when the logic patterns are false.
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.
To define a time qualified
pattern trigger
9. You can time qualify a pattern logic trigger, that is, you can
specify the amount of time that the Boolean logic function
must be True. You must select Less than or More Than for
the Trigger When Pattern control. Then, click on Trigger
When Time and set the time using the multipurpose knob or
keypad.
To Next Page
Loading...
Need help?
General
