Table of Contents
Advertisement
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 30,000 cycles of the clock signal that we are triggering on.
Because this scope can update waveforms as fast as 50,000 waveforms/sec,
the scope can capture the glitch on average once or twice per second.
Let's now use the scope's Mask Test capability to analyze this glitch.
9
10
11
12
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 50,000 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 relates to approximately three or fewer defects per million tested.
Because this particular glitch occurs 1/30,000, we have a Sigma quality
factor that is lower than 6 . Let's now set up the oscilloscope to stop on
the first detected failure.
13
14
15
36
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.
Press [Run/Stop] to stop acquisitions.
Press the
(Back) key.
Back
Press Statistics.
Figure
19. This particular glitch occurs just
Figure
20. A Sigma quality factor
2000 X-Series Oscilloscopes Advanced Training Guide
Advertisement
Table of Contents
