PEC Flaw Detector PE4332 Operation Manual
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this line. If this line is unavailable, then the measured thickness shall be considered
incorrect; such example is shown in Figure 48.
Figure 48. Unavailable point of crossing the threshold on A-scan
Such situation may arise, if you have incorrectly set the value of "Insulation
thickness" and the test item parameters such as the nominal wall thickness and the
material of the insulation casing. If such situation arises, then it is necessary to enter
the correct parameters.
It is also necessary to ensure that, before crossing the threshold, the
demagnetization process is monotonous, close to the line. There can be situations
when the signal waveform on the A-scan can become non-monotonous with a
variable component. Such example of A-scan is shown in Figure 49.
Figure 49. Fluctuations on A-scan
With such signal waveform, the thickness measurements will be most likely incorrect.
At points with a similar A-scan, it is required to re-measure the thickness. This signal
