Preparatory Notes for ASNT NDT Level III Examination - Ultrasonic Testing, UT

DAC Curve Plot
1. Obtained the signal from the refernce reflector and mark on the
graticule/traspatrent sheet with gain setting at 80% FSH.
2. Set the gain control -6bB and marks the 50% mark.
3. Set the gain contril to the
4. Obtained the signal at the gain setting in item 1 and repeat the process at
different sound paths.
5. Plot the curves at the gain setting and -6dB.
6. Determined the transfer correction.
7. Scanned the work pieces at the “Gain Setting + Transfer Correction”