Agilent Technologies InfiniiVision 3000 X- Series Advanced Training Manual page 36

2
Oscilloscope Familiarization Labs
At this point, you should be able to see that the scope is capturing an
infrequent glitch as shown in
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.
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Figure 20 Mask Testing provides us within detailed statistics about the rate of occurrence
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
of 6
Because this particular glitch occurs 1/1,000,000, we have a Sigma quality
factor that exceeds 6
first detected failure.
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Press [Analyze].
Press Features Mask two times to turn on mask testing.
Press Automask.
Press Create Mask to automatically create a pass/fail mask around this
waveform.
of the infrequent glitch.
σ
relates to approximately three or fewer defects per million tested.
σ
. Let's now set up the oscilloscope to stop on the
Press [Run/Stop] to stop acquisitions.
Press the (Back) key.
Back
Figure 19. This particular glitch occurs just
Figure 20. A Sigma quality factor
3000 X-Series Oscilloscopes Advanced Training Guide