Technical data

36 3000 X-Series Oscilloscopes Advanced Training Guide
2 Oscilloscope Familiarization Labs
At this point, you should be able to see that the scope is capturing an
infrequent glitch as shown in Figure 19. This particular glitch occurs just
once every 1,000,000 cycles of the clock signal that we are triggering on.
Because this scope can update waveforms as fast as 1,000,000
waveforms/sec, the scope can capture the glitch on average once per
second. Let’s now use the scope’s Mask Test capability to analyze this
glitch.
9 Press [Analyze].
10 Press Features Mask two times to turn on mask testing.
11 Press Automask.
12 Press Create Mask to automatically create a pass/fail mask around this
waveform.
Because the InfiniiVision oscilloscope’s mask testing capability is
hardware-based, it can test up to 280,000 waveforms/sec and provide
detailed pass/fail statistics including failure rate in terms of both percent
and a Sigma quality factor as shown in Figure 20. A Sigma quality factor
of 6σ relates to approximately three or fewer defects per million tested.
Because this particular glitch occurs 1/1,000,000, we have a Sigma quality
factor that exceeds 6
σ. Let’s now set up the oscilloscope to stop on the
first detected failure.
13 Press [Run/Stop] to stop acquisitions.
14 Press the (Back) key.
Figure 20 Mask Testing provides us within detailed statistics about the rate of occurrence
of the infrequent glitch.
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