4. Dual Echo calibration
：
Calibrate the velocity from the test block of known
thickness.
5.Setting the velocity manually
：
If the material velocity is known, for example
the velocity of steel is 5900m/s. The sound velocity can be setting manually.
3.1.1 Probe zero calibration
Note: The calibration result is 4.00mm, only under the sound velocity of
5900m/S.
3.1.2
One point calibration
3.1.3 Two point calibration
3.1.4 Dual Echo calibration
7
8
