910-269-EN, Rev. B, June 2011
144 Chapter 9
Figure 9-6 The second gated calibration signal
12. Couple the transducer to the thick calibration block step.
In this example, the transducer is coupled to the 0.500 in. step.
13. Use the [GATE] key to position gate 1 so that the first back-wall echo from the
known thickness step exceeds the gate threshold.
14. Press [GAIN], and then adjust the gain value so that the echo amplitude is at
approximately 80
%.
A thickness measurement reading appears in large text above the A-scan.
15. 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.
16. In the dialog box, adjust the value to match the known thickness of the gated
indication (0.500
in. in this example), and then choose Calculate to complete the
calibration process.
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