Figure 1-19. Angle Determination with IIW Block

Angle Beam Point of Incidence (Miniature Angle Beam Block)

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

TM-1-1500-335-23 Nondestructive Inspection Methods Manual
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T.O. 33B-1-1 1.8.2.6.3 Angle Beam Angle Determination (IIW Block). a. Position the search unit on scale ‘‘A’’ or ‘‘B’’ as shown in Figure 1-19. Move the search unit back and forth until the peak signal from the hole is obtained. b. Read the refracted angle from the position on scale ‘‘A’’ or ‘‘B’’ coinciding with the point-of-incidence. In Figure 1-19, P-1 shows 60^o; and P-2 shows 45^o. Figure 1-19. Angle Determination with IIW Block 1.8.2.6.4 Angle Beam Angle Determination (Miniature Angle Beam Block). a. Position the search unit on scale ‘‘A’’ or ‘‘B’’ as shown in Figure 1-22. Move the search unit back and forth until the peak signal from the hole is obtained. b. Read the refracted angle from the position on scale ‘‘A’’ or ‘‘B’’ coinciding with the point-of-incidence. In Figure 1-22, P-1 shows 45^o; and P-2 shows 70^o. c. Angle beam determination can also be done with the miniature angle beam block Figure 1-22. 1-66 Change 3

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