Fluke Biomedical 190M III Series, Руководство пользователя

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190M Series III
Users Manual
12
6. Use the cursor and
E
to select Average: Normal (normal average) or Smart (smart
average, see below).
You can use the average functions to suppress random or uncorrelated noise in the waveform
without loss of bandwidth. Waveform samples with and without smoothing are shown in
Figure 7 .
Smart Average
In the normal average mode occasional deviations in a waveform just distort the averaged wave
shape, and do not show up on screen clearly. When a signal really changes, for instance when
you probe around, it takes quite some time before the new wave shape is stable. With smart
averaging you can quickly probe around, and incidental waveform changes like a line flyback in
video show up on screen instantly.
Figure 7. Smoothing a Waveform
Persistence, Envelope and Dot-Join to View Waveforms
You can use Persistence to observe dynamic signals. See Figure 8 .
1. Press
P
to show the SCOPE key labels.
2. Open the WAVEFORM OPTIONS menu with 4 .
3. Use the cursor and
E
to highlight to Waveform: and open the Persistence... menu.
4. Use the cursor and E to select:
a. Digital Persistence: Short, Medium, Long or Infinite to observe dynamic waveforms like on
an analog oscilloscope.
b. Digital Persistence: Off, Display: Envelope to see the upper and lower boundaries of
dynamic waveforms (envelope mode).