User Manual

Sampling oscill
oscope concepts
Pretrigger data can help you troubleshoot signal problems. For example, to find the cause of an unwanted glitch in your test
circuit, trigg
er on the glitch signal and look at the pretrigger waveform. By analyzing what happens before the glitch, you may
uncover information that helps you find the source of the glitch.
Trigger slope and level concepts
The oscilloscope must detect both the slope and level conditions before it can trigger and display a stable waveform.
The minimum trigger conditions needed to display a stable waveform are the signal slope and threshold level. The
slope sets the oscilloscope to find the trigger point on the rising or the falling edge of a signal. The level sets w here on
that edge the trigger point occurs.
The trigger Slope sets the oscillos cope to
find the trigger event on the rising or the
falling edge of a signal.
The trigger threshold Level (or just level) i s
the signal amplitude value on a slope that
must occur for the oscilloscope to trigger on
a signal.
A runt trigger needs two thresholds to define
the two levels that a signal must pass through
to be considered a valid (nonrunt) signal.
The arrow at the far right of the screen marks
the threshold level(s) for that signal.
Turning the Trigger Level knob changes
the threshold level and momentarily displays
a long horizontal line (or two lines for a
runt trigger) across the waveform to show
the trigger level(s) in relation to the overall
waveform.
Available trigger types
The
oscilloscope lets you trigger on several signal conditions:
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