Agilent Technologies InfiniiVision 3000 X- Series, Advanced Training Manual, Page: 36 / 128

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 6
σ
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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