
•
Press Slope/Coupling .
A softkey menu appears on the display. If you selected Auto level,
Auto, Normal, or Single as a trigger mode, six softkey choices are
displayed. If you selected TV as a trigger source, five other softkey
choices are available.
•
Toggle each of the softkeys and notice which keys affect the status line.
•
External trigger input coupling (ac or dc) is selected from the External
Trigger menu.
3
Adjust the Holdoff knob and observe how it changes the display.
Holdoff keeps the trigger from rearming for an amount of time that you set.
Holdoff is often used to stabilize the display of complex waveforms. The
Holdoff range is from 300.0 ns to about 13.5 s. When you adjust the Holdoff
knob, the current holdoff time is briefly displayed in inverse video near the
bottom of the display. For an example of using Holdoff, refer to the section,
"To trigger on a complex waveform" on page 2-12.
To set a long holdoff time, go to a slower sweep speed.
The value used to increment the holdoff depends upon the sweep speed or
time/div selection. However, the actual holdoff value is a fixed number; it is not
a percentage of sweep speed. For a time/div setting of 5 ns/div, the holdoff
increment is 50 ns. For a time/div setting of 5 s/div, the holdoff increment is
100 ms.
The Oscilloscope at a Glance
To trigger the oscilloscope
1–15
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