Figure 9-26 Example Of A Gated Signal For Zero Calibration - Olympus EPOCH 650 User Manual

4. Use the G1Start button (P5 key) to position gate 1 so that the reflection from the
first side-drilled hole is exceeding the gate threshold. This reflection should be
close to 12.5 mm (0.5 in.) (see Figure 9-26 on page 177).

Figure 9-26 Example of a gated signal for zero calibration

5. Press dB, and then adjust the gain so that the echo amplitude is at approximately
80 %.
The AUTO XX% feature can be used to automatically adjust the gain to set the gated
echo amplitude to XX% of full screen height (the default XX value is 80 %). To activate
this feature, press 2
ND
A thickness measurement reading appears in large text above the A-scan.
6. Once a steady reading is achieved, choose Auto Cal > Cal-Zero.
The screen freezes and the Cal-Zero box appears (see Figure 9-27 on page 178).
Thickness measurement
F, (AUTO XX%).
DMTA-10055-01EN, Rev. A, February 2015
Calibration 177