910-269-EN, Rev. B, June 2011
154 Chapter 9
9.7.1 Locating the Beam Index Point
The beam index point (BIP) is the point at which the sound leaves the wedge and
enters the material with maximum energy. The following procedure provides a
method to identify the BIP for your probe/wedge.
To locate the BIP
1. Couple the probe to the test block at the 0 mark.
Figure 9-12 IIW block with probe at 0 mark
2. Manipulate the probe until a high-amplitude signal appears on the screen after
the excitation pulse.
This is the reflection from the large arc of the block that is located on the Type I
block at 4.00
in. (100 mm).
3. Move the probe forward and backward to bring the echo to its maximum
amplitude (peak).
4. Ensure the echoes do not exceed 100 %. If necessary, reduce the gain.
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