910-269-EN, Rev. B, June 2011
Calibrating the EPOCH 1000 Series (Conventional UT Mode) 141
With a zero offset of 0.000 µs, the excitation pulse (or main bang) should appear
on the left side of the screen.
3. Choose 1/5 > Basic > Zero, and then increase the value until the excitation pulse
moves off the left side of the screen and the interface echo from the end of the
delay line tip appears on the screen.
4. Verify that the echo represents the end of the delay by tapping your finger on the
end of the couplant-coated delay line. This dampens the signal and the echo
should jump up and down on the screen.
5. Choose 1/5 > Basic > Zero, and then increase the value to move this echo to the left
side of the screen so that it is barely visible.
6. Select 1/5 > Auto CAL > CAL Mode = Thickness.
7. Couple the transducer to the thin calibration block step. For this example, the
transducer is coupled to the 0.100
in. step.
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], 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 (see
Figure 9-4 on page 142).
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