910-269-EN, Rev. B, June 2011
Calibrating the EPOCH 1000 Series (Phased Array Mode) 283
7. Choose the 1/5 > PA CAL > Start to begin the calibration process.
The screen freezes and the Enter Value for Zero Cal dialog box appears.
Figure 17-6 The Enter Value for Zero Cal dialog box
8. Adjust the value to match the known thickness of the gated indication (0.600 in. in
this example), and then choose Continue to continue to the second calibration
step.
The A-scan at the top of the screen is replaced by a new view representing the
thickness measurement reading (yellow line) for the gated indication across all
focal laws (see
Figure 17-7 on page 284). Ideally, the thickness measurement
reading line should be a straight line, indicating that the instrument is making the
same thickness measurement from the same reflector for each focal law. A dotted-
line through the center of this small window represents the user-defined known
value of the actual thickness measurement. In this example, the uncalibrated line
should look like the one shown in
Figure 17-7 on page 284.
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