The paper considers basic problems related to utilization of ADD diagrams i
n calibrating sensitivity of ultrasonic detectors. We suggest that a conven
ient tool for solving such problems can be the software package ADD Unviers
al, Version 2.1 designed for plotting individual ADD diagrams For normal an
d slanted transducers. The software is compatible with the contemporary ope
rational system Windows-95(98). Reference signals for calibration are gener
ated in a sample with cylindrical holes.