How to ? Trigger on a pattern
Trigger on a pattern
Use the following 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 tim
e before the instrument triggers.
1. Push the front-panel Advanced button.
2. In the Trigger control window, Open the A Event tab.
3. Select Pattern from the Trigger Type drop-down list.
4. Select a value from the Input Threshold 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 channel s that will not be used as part of the pattern.
5. To set the Input Threshold voltages, click one of the Threshold Presets buttons to define the level type.
If you s
elected USER, click in the Ch <1–4> entry boxes, and then use the multipurpose knobs or
pop-up keypad to set each threshold.
6. Select
the Pattern Type Boolean logic function for the combination of input channels. The instrument
will trigger on a clock edge when the input waveforms match the s pecified logic pattern.
NOTE. See Pattern Triggers
(see page 649) for definitions of the logic functions for pattern triggers.
7. From the Pattern drop-down 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.
8. Yo u can time qualify a pattern logic trigger, that is, you can specify the amount of time the Boolean
logic function must be True:
NOTE. On MSO/DPO5000 Series instruments, < or > are u sed instead of Less than or More Than
from the Pattern drop-down list.
a. Select Less than or More Than from the Pattern drop-down list.
b. Under Pattern, click in the Time entry box, and then use the multipurpose knob or keypad to
set the time.
NOTE. When you select Less Than and specify a time, the input conditions must drive the logic
function true for less than the specified time. Conversely, the true for More Than item requires the
Boolean function to be true for longer than the time you specify.
648 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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