910-269-EN, Rev. B, June 2011
Calibrating the EPOCH 1000 Series (Conventional UT Mode) 147
7. Couple the transducer to the thin calibration block step.
For this example, the transducer is coupled to the 0.100 in. step. As noted above, a
higher gain setting is required to produce a clean leading edge of the signal. Do
not be concerned with the jagged peaks of the echo. Concentrate on the leading
edge only.
8. Use the [GATE] key to position gate 1 so that the first back-wall echo from the
known thickness step exceeds the gate threshold.
9. Press [GAIN] to adjust the gain setting so that the echo amplitude is at
approximately 80
%.
A thickness measurement reading appears in large text above the A-scan.
Figure 9-7 Example of a gated calibration signal
10. Once a steady reading is achieved, Choose 1/5 > Auto CAL > CAL Zero.
The screen freezes and the Enter Value for Zero Cal dialog box appears.
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