Figure 9-10 Example Of A Gated Signal For Zero Calibration - Olympus EPOCH 650 User Manual

DMTA-10055-01EN, Rev. A, February 2015
6. Select Auto Cal > Type = Thickness.
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 G1Start button (P5 key) to position gate 1 so that the leading edge of the
first back-wall echo from the known thickness step exceeds the gate threshold.
9. Press dB and adjust the gain setting so that the leading edge from the echo is as
close to vertical as possible.
A thickness measurement reading appears in large text above the A-scan.

Figure 9-10 Example of a gated signal for zero calibration

10. Once a steady reading is achieved, Choose Auto Cal > CAL Zero.
The screen freezes and the Cal-Zero box appears (see Figure 9-11 on page 159).
158 Chapter 9
Thickness measurement