Keysight 4000 X-Series, Advanced Training Manual

Page: 36 / 170

36 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.