The BIP (beam index point) must be calibrated regularly as it can change due to wedge wear.
- With a brand new wedge, the BIP is where it should be
- When the wedge start to wear, it is not unusual that it wears more at the front or at the back changing the BIP
- To calibrate the BIP, the probe is placed on an IIW block
- The signal from one of the radius is peaked (maximized) by moving the probe forth and back
- When the signal is peaked, the wedge is marked in line with the center of the radius
Good calibration of the BIP is essential in order to do precise measurements.