Figure 9-12 Example Of A Gated Signal For Velocity Calibration - Olympus EPOCH 650 User Manual

DMTA-10055-01EN, Rev. A, February 2015

Figure 9-12 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. Adjust the gain so that
the echo amplitude is at approximately 80 %.
14. Once a steady reading is achieved, choose Auto Cal > CAL Velocity.
The screen freezes and the Enter Value for Velocity Cal box appears.
15. 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 9-13 on page 161).
160 Chapter 9