Figure 1-20. Angle Beam Distance Calibration with IIW Block

Figure 1-19. Angle Determination with IIW Block

Figure 1-21. Angle Beam Distance Calibration with Miniature Angle Beam Block

TM-1-1500-335-23 Nondestructive Inspection Methods Manual
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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 45^o 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

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