Coupling the probe with the testing block. At this time the bar lines displayed on
the screen will disappear one after the other until the screen displays 4.0mm.
This indicates that the calibration is over:
4.4 Calibration to a known velocity: thickness measurement
Put the coupling agent in the place to be measured.
Adjust the sound velocity depending on the material (see table in black). (If it is
not clear what the right sound velocity should be, for example when the material
is unknown or readings are not correct at a certain velocity, then first read
paragraph 4.5)
Couple the probe with the material to be measured.
The measurement can thus start. The screen will display the thickness of the
material to be measured, for example:
Note: When the probe couples with the material to be measured, the coupling
indication sign will be displayed on the left side at the display. If the coupling
indication flicks or does not appear, it shows that the coupling is not well done. Take
the probe away, the thickness value will remain and coupling indication will
disappear.
4.5 Calibration to a known thickness: sound velocity measurement
If it is desired to measure the sound velocity of a certain material, a testing block with
a known thickness must be used to measure the sound velocity as follows:
Use a vernier caliper or micrometer to measure the test piece thickness
6
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