BLOCK CHARACTERISTICS

A.1 Typical reference block used to perform DAC/TCG;

check time delays (related to the probe shoe wear) and index point.

A given reference block may cover a range of component curvature from 100 % to 70 % of its own curvature, provided appropriate correction in ultrasonic path and sensitivity are taken into account.

The end of the block may have a radius (r = 15 mm).