Finding Hidden Waveform Details With The Scope - Fluke 91 Series II User Manual

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Tips for single shot measurements:
(I) Make sure DC coupling is on for the input being
used.
(II) Make sure that TRACE START is set for "Wait for
Trigger".
(III) Set a trigger level that is above the base line noise
but below the expected waveform amplitude.
(IV) Use TIME delay to ensure that you catch the start
of the event, for example -4 divisions.
(V) Select a time base that is fast enough to catch the
waveform, yet slow enough to capture a sufficient
length of waveform. Often the use of the GLITCH
DETECT mode (see the following example), and
the CAPTURE 20 DIV mode can help.
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FINDING HIDDEN WAVEFORM DETAILS
WITH THE SCOPE
A. GLITCHES
Connection
Connect the red scope probe from INPUT A to TP2 on the
Demo Board.
Making the Measurement
1. Reset the ScopeMeter test tool (
2. Press to select the SCOPE mode.
3. Press .
It appears as if the waveform is a simple pulse with about a
25% duty cycle. Occasionally small spikes may be seen. To
check exactly what is happening, turn on GLITCH
DETECTion to capture any fast transients that may occur.
4. Press .
5. Press to turn GLITCH DETECT on.
It may be necessary to adjust trigger level, range and time
base manually.
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