DMTA-10040-01EN, Rev. E, February 2018
Chapter 5262
6. Place the probe in a defect-free area of the calibration standard near the thru-wall
flaw, and then press the NULL foot switch.
7. Slowly scan the entire length of the tube, and press the FREEZE key ( ) when
done (see Figure 5-197 on page 262).
Remote-field testing (RFT) requires a slow inspection speed, and practice. Scan the
tube at several inspection speeds and note how the signal varies until you are
comfortable with the scan rate.
Figure 5‑197 A slow scan rate (optimal signal, left) and a fast scan rate (loss of
signal, right)
8. Adjust the support ring signal so that it is not being clipped by the screen (8 to 9
major divisions) [see Figure 5-198 on page 263].
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