YUSHI INSTRUMENTS
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There are many ways to calibrate the angle beam probe, the standard test block isn't wedded to
the calibration, and you can also use a pinhole of known depth to do calibration. Theoretically, the
smaller reference reflector is, the more precise the calibration is, but the difficulty of calibration
increases correspondingly. When you use a pinhole to do calibration, you can measure the depth and the
horizontal position of the pinhole to calculate the slope coefficient to calibrate the angle, and then you
can use the depth or the horizontal position value that you measure to calibrate the sound velocity and
the probe zero.
4.4 Making of DAC Curve (NB/T 47013-2015 by CSK-IIA block)
1. First calibrate the probe as above mentioned
2. Couple the probe to the reference block to make the echo of the first reference point reach the
highest level (we use CSK-IIIA test block as an example, as shown in Figure 4-10).
Figure 4-7
Figure 4-9
Figure 4-8