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pulses that are outside the range.
Set the level
8. Click Level and use the multipurpose knob or pop-up
keypad to set the trigger level.
Set mode and holdoff
9. 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.
Triggering on Transition Time
Use this 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.
Select transition
triggering
1. Push the front-panel ADVANCED button.
2. In the Trigger Setup control window, select the A Event tab.
3. Click Transition.
Select the source
4. To specify which channel becomes the trigger source, click
Source, and select the source from the list.
Select t he polarity
5. Select a Polarity value to specify the direction of the pulse
edge:
 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.
 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.
 Either monitors positive- and negative-going edges of
pulses. The edge may first cross either threshold and then
cross the other.
Set the transition time
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 the Upper Level or Lower Level
button and use the multipurpose knobs or pop-up keypad to
set the values for the upper and lower levels.
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.
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