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2
Oscilloscope Familiarization Labs
When we attempt to capture multiple RF bursts that are separated by
4.0 ms, the scope under- samples and shows varying amplitudes of the
signal as shown in
automatically reduced its sample rate in order to capture a longer
time- span with its limited amount of acquisition memory. Let's now
zoom- in and take a closer look at this under- sampled data.
10
11
Figure 17 Zooming in reveals an under-sampled waveform.
After acquiring the waveform at the slower timebase setting, and then
zooming in, we can clearly see that our waveform was under- sampled as
evidenced by the triangular shaped waveforms shown in
Remember, this should be a burst of sine waves.
Although using the scope's Peak Detect mode would provide us with a
more accurate measure of the peak amplitudes of each burst when
captured at the slower timebase setting
waveform would still be under- sampled after zooming in on a stored trace.
Another solution would be to purchase a scope with much deeper
memory. Let's now use the scope's Segmented Memory acquisition mode to
capture multiple bursts with high resolution.
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32
Figure
Press [Run/Stop] to stop repetitive acquisitions ([Run/Stop] key will turn
red).
Now set the scope's timebase to 200.0 ns/div.
Press [Run/Stop] to begin repetitive acquisitions again with the timebase
still set at 200.0 ns/div ([Run/Stop] should turn green).
16. Again, this is because the scope
(Figure
2000 X-Series Oscilloscopes Advanced Training Guide
Figure
17.
16), we would see that the
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