8. In the Trigger if Logic State 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.
TIP. For simplest operation, leave this control set to True. Setting the control to False complements the output of the chosen
pattern function (for example, from AND to NAND or NOR to OR).
9. You can set the mode and holdoff for all standard trigger types. Refer to trigger mode and set holdoff to learn more about
trigger mode and holdoff.
Trigger on the transition time
Use the following procedure to detect and trigger on pulse edges that traverse between two thresholds at faster or slower rates
than the specified time. You can set up the instrument to trigger on positive or negative edges.
1. Push the front-panel Advanced button.
2. In the Trigger control window, Open the A Event tab.
3. Select Transition from the Trigger Type drop-down list.
4. Specify the trigger source. Click Source; then select a channel from the drop-down list.
5. Click a Polarity button to specify the direction of the pulse edge:
â–
Pos. Monitors the transition time (slew rate) of the positive-going edges of pulses. The edge must first cross the lower
threshold and then cross the upper threshold.
â–
Neg. Monitors the transition time (slew rate) of the negative-going edges of pulses. The edge must first cross the upper
threshold and then cross the lower threshold.
â–
Either. Monitors positive- and negative-going edges of pulses. The edge may first cross either threshold and then cross
the other.
6. The threshold levels and the delta time setting determine the transition time (slew rate) setting. The level settings determine
the voltage component of slew rate (Volts/Second). Click in the Upper Level or Lower Level entry boxes; then use the
multipurpose knobs or pop-up keypad to set the values for the upper and lower levels.
NOTE. You can set the level(s) to a value appropriate to either the TTL or ECL logic families by clicking TTL or ECL on the
Level pop-up keypad.
TIP. To use the trigger level marker to help in setting threshold levels, open the Display control window Objects tab; then
click Long to activate the marker.
7. To finish specifying the slew rate (transition time), set the time component by clicking in Time entry box; then use the
multipurpose knob or keypad to set the delta time value.
How to ?
DPO70000SX, MSO/DPO70000DX, MSO/DPO70000C, DPO7000C, and MSO/DPO5000B Series 631
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