Technical data

34 4000 X-Series Oscilloscopes Advanced Training Guide
2 Oscilloscope Familiarization Labs
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 Figure 17.
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 (Figure 16), we would see that the
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.
12 Press [Run/Stop] to begin repetitive acquisitions again with the timebase
still set at 200.0 ns/div ([Run/Stop] should turn green).
13 Press the [Acquire] front panel key (near the Cursors knob); then press
the Segmented softkey to open the Segmented Memory settings.
14 Set # of Segs = 500.
15 Now press the Segmented softkey to turn on this mode of acquisition.
The scope should have just captured 500 consecutive occurrences of this
burst. Let’s review them.
Figure 17 Zooming in reveals an under-sampled waveform.