T.O. 33B-1-1
Figure 1-20.
Angle Beam Distance Calibration with IIW Block
1.8.2.6.5
Angle Beam Distance Calibration (IIW Block).
The following procedure works only for a 45o angle beam.
a.
Position the, search unit at P-1 as shown in Figure 1-20 and adjust the position laterally to obtain
equal amplitude signals from R-2 and R-4.
b.
The distance between the R-2 and R-4 signals is 2 inches. Set the time base range for the applicable
distance calibration.
c.
Another method is to position the search unit along scale ‘‘C’’ and obtain a peak signal from the hole
as shown in Figure 1-20. Distance is read directly off the scale. P-2 shows 2.5 inches; P-3 shows 5
inches.
Change 3
1-67
