910-269-EN, Rev. B, June 2011
160 Chapter 9
9. Press [GAIN], and then adjust the gain so that the echo amplitude is at
approximately 80
%.
A thickness measurement reading appears in large text above the A-scan.
10. Once a steady reading is achieved, choose 1/5 > Auto CAL > CAL Velocity.
The screen freezes and the Enter Value for Velocity Cal dialog box appears.
Figure 9-18 The Enter Value for Velocity Cal dialog box
11. Adjust the value to match the known thickness of the gated indication (9.000 in. in
this example), and then choose Calculate to complete the calibration process.
9.7.4 Calibrating for Sensitivity
The final step in the angle beam calibration is to calibrate for sensitivity. This allows
you to set up a reference gain level.
To calibrate for sensitivity
1. Couple the probe to the IIW calibration block so that the transducer is aiming at
the 0.060
in. (1.5 mm) diameter side-drilled hole, used as a reference-reflector.
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