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Zooming-In on a single range -- It's Easy to See the Differences
This is an example of a typical Frequency Shift.
This shift is typical from 50-500 Hz. The Green block represents the
Pass/Fail criterion (or limit).
If the peak is inside the block, the part passes and is ready for the
next process.
This is an example of the absence of or the significant difference
in the amplitude of a peak. The defect caused the part to dampen
faster and not hold its tone.
Example of Decay Rate in Time Domain
This is the response time waveform. Notice how the bad part's (red)
resonant response decays!
Operation
Once the Pass/Fail criteria have been set for a given
part, the NDT-RAM application can be brought online. Parts can be
tested in just a few seconds, and the system can be entirely
automated, allowing the inspection of 100% of your high volume
production line parts.
A record of every tested part is automatically stored in report
form for each different part. This allows the ability to perform
statistical analysis on lots, shifts, percent and type of defects.
Example Test
Sometimes it is necessary to have more than one Pass/Fail criterion.
Below is an example of a part that requires Four points be checked to
determine a good part from a defective part. In this test, all four
points must be good for the part to pass.
Blue passed all Four limits -- Good
Pink failed Three of Four Limits -- Defective
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