Figure 9-8 Example Of A Gated Signal For Velocity Calibration - Olympus EPOCH 650 User Manual

Figure 9-8 Example of a gated signal for velocity calibration

12. Couple the transducer to the thick calibration block step.
In this example, the transducer is coupled to the 0.500 in. step.
13. Use the G1Start button (P5 key) to position gate 1 so that the first back-wall echo
from the known thickness step exceeds the gate threshold.
14. Press dB, 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.
15. Once a steady reading is achieved, choose Auto Cal > Cal-Vel.
The screen freezes and the Cal-Vel box appears.
16. In the Cal-Vel box, adjust the value to match the known thickness of the gated
indication (0.500 in. in this example), and then choose Done to complete the
calibration process (see Figure 9-9 on page 156).
DMTA-10055-01EN, Rev. A, February 2015
Calibration 155