Fluke 91 Series II User Manual page 152

ScopeMeter Test Tool Tutorial
Figure 8-15 Glitch Detection
The glitches on this waveform are clearly visible on the
trace, but what if the glitches are only intermittent and
occur once a day. Watching the screen the whole day is not
realistic, but for this purpose the Min Max envelope mode
can be turned on. Min Max envelope retains all the
samples on the display.
To turn on the Min Max envelope mode and only catch
triggered data, do the following:
6. Press .
You will then see the sample points build up on the screen.
These points stay on the screen, even if the waveform
disappears, for example, if you remove the scope probe.
B. NOISE
Often waveforms have lots of noise superimposed upon
them. Sometimes you need to measure the noise and
sometimes you need to see the waveform through the
noise. The Average feature helps in smoothing the random
noise out of the waveform.
Connection
Connect the red scope probe from INPUT A to TP5 on the
Demo Board.
Making the Measurement
1. Reset the ScopeMeter test tool (
2. Press to select the SCOPE mode.
3. Press .
4. Press on INPUT A to increase the amplitude to
almost full screen.
5. Press to position the waveform on the screen.
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