310
Tip
To use the trigger level marker to help in setting the
threshold levels, open the Display Setup control window,
and click Long on the Objects tab.
7. To finish specifying the slew rate (transition time), set the
time component by clicking Time and using the
multipurpose knob or keypad to set the delta time value.
8. Click Trigger When Transition Time < to trigger when the
transition time is less than the time you set above. Click
Trigger When Transition Time > to trigger when the
transition time is greater than the time you set above.
If you select Trigger When Transition Time > (greater than)
and the instrument does not trigger, the pulse edge may be
too fast. To check the pulse edge speed, switch to edge
triggering. Trigger on the pulse edge and determine the time
the edge takes to travel between the upper and lower levels
that you set for this trigger. The instrument cannot transition
trigger on pulse edges that traverse between threshold levels
in 600 ps or less.
Also, to reliably trigger on transition time, a pulse must have a
width of 7.5 ns or more. A pulse of less width may trigger on the
wrong slope or not trigger at all. Switch to edge triggering, and
check the pulse width if you can't trigger on transition time as
expected.
Set mode and holdoff
9. Mode and holdoff can be set for all standard trigger types.
Refer to trigger mode on page137 and Set holdoff on page
122 to learn more about trigger mode and holdoff.
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