Change 1 2-38.3
(1) SET UP
(a) Attach the transducer and cable to the ultrasonic instrument.
(b) Apply a thin layer of couplant to the calibration standard bolt head
surface near the edge of the bore.
(c) Smooth the couplant with your finger to produce a uniform thin layer
around the bolt.
(d) Place the POSITIONER on the calibration standard and rotate it until
the OD guide hole is above the lower outside diameter EDM notch.
(e)Insert the TRANSDUCER in the OD guide hole until it bottoms.
Slowly rotate the POSITIONER to maximize the signal from the
notch. Reference Figure 1 for positioning, reference Figure 2 for
signal position on the CRT display.
Figure 1. Positioner/transducer placement