Figure 9-22 Example Of A Gated Signal For Velocity Calibration - Olympus EPOCH 650 User Manual

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

Figure 9-22 Example of a gated signal for velocity calibration

Another echo might be present on the screen at approximately the 200 mm (8 in.)
point. Disregard this echo as it is usually the result of beam spreading and sound
bouncing off the side of the block. Ensure that gate 1 is not over this echo.
8. Press dB, and then adjust the gain so that the echo amplitude is at approximately
80 %.
The sound path measurement reading appears in the Reading 2 box.
9. Once a steady reading is achieved, choose Auto Cal > Cal-Vel.
The screen freezes and the Enter Value for Velocity Cal box appears (see
Figure 9-23 on page 173).
172 Chapter 9