TO-BA-e-2020
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Note:
One or
two-point calibration
must be performed on a material after the removal
of paint or coating. Otherwise, it will result in a calculation of the material speed that is
different from the actual material speed of the material to be measured.
5.4.1 Calibration to known speed
Note:
This procedure requires a sample of the specified material to be measured, the
exact thickness of which is known, e.g. by measuring it in a different way.
A table with common materials and their sound velocities can be found in Appendix A
to this manual.
In the Set
Velocity
dialog box, press the F1 / F2 and
/
keys to adjust the velocity
value up or down until it matches the sound velocity of the material being measured.
You can also press
the button to select between the preset speeds.
5.4.2 Calibration to known thickness
Note:
This procedure requires a sample of the specified material to be measured, the
exact thickness of which is known, e.g. by measuring it in a different way.
1. Perform the "Probe
Zero
" function with a standard 4.00 mm plate.
2. Apply the coupling agent to the test sample.
3. Press the transducer against the sample and make sure that the transducer is
flat against the surface of the sample. The display should show a certain
thickness value and the connection status indicator should be steady.
4. After you have achieved a stable measured value, remove the transducer. If the
displayed thickness differs from the value displayed during transducer coupling,
repeat the step in section 3.
5. Press the or
key to
display the Input Nominal
Thickness
dialog box. See
the figure below.
6. Press F1 / F2 and or
to enter the thickness value until it matches the
thickness of the sample.
7. Press
/ F3 to confirm the entry. The meter exits the input field and returns to
the measuring mode. It now displays the calculated sound velocity value
determined from the entered thickness value.
The measuring instrument is now ready to measure.
