Figure 9-28 Example Of A Gated Signal For Velocity Calibration - Olympus EPOCH 650 User Manual

Figure 9-28 Example of a gated signal for velocity calibration

8. Press the G1Start button (P5 key) to position gate 1 so that the reflection from the
second side-drilled hole is within the gated region.
This reflection should be close to 38.1 mm (1.5 in.).
9. Press dB and adjust the gain so that the echo amplitude is at approximately 80 %.
A thickness measurement reading appears in large text above the A-scan.
10. Once a steady reading is achieved, choose Auto Cal > Cal-Vel.
11. Adjust the value in the Cal-Vel dialog box to match the known thickness of the
gated indication (see Figure 9-29 on page 180).
DMTA-10055-01EN, Rev. A, February 2015
Calibration 179