4.3.2 Calibration to a known velocity
Note: This procedure requires that the operator knows the sound velocity of the material to be measured. A table
of common materials and their sound velocities can be found in Appendix A of this manual.
1) Press
the
key to activate the calibration mode. The MM (or IN) symbol should begin flashing.
2) Press
the
key again, so that The M/S (or IN/
μ
S) symbols are flashing.
3) Use
the
key and the
key to adjust the sound velocity value up or down, until it matches the sound
velocity of the material to be measured. You can also press the
key to switch among the preset
commonly using velocities.
4) Press
the
key to exit from the calibration mode. The gauge is now ready to perform measurements.
To achieve the most accurate measurements possible, it is generally advisable to always calibrate the gauge
to a sample piece of known thickness. Material composition (and thus, its sound velocity) sometimes varies from
lot to lot and from manufacturer to manufacturer. Calibration to a sample of known thickness will ensure that the
gauge is set as closely as possible to the sound velocity of the material to be measured.
4.3.3 Two Point Calibration
Note: This procedure requires that the operator has two known thickness points on the test piece that are
representative of the range to be measured.
1) Perform a Probe-Zero.
2) Apply couplant to the sample piece.
3) Press the transducer against the sample piece, at the first/second calibration point, making sure that the
transducer sits flat against the surface of the sample. The display should show some (probably incorrect)
thickness value, and the coupling status indicator should appear steadily.
4) Having achieved a stable reading, remove the transducer. If the displayed thickness changes from the value
shown while the transducer was coupled, repeat step 3.
5) Press
the
key. The MM (or IN) symbol should begin flashing.
6) Use the
key and the
key to adjust the displayed thickness up or down, until it matches the
thickness of the sample piece.
7) Press
the
key. The display will flash 1OF2. Repeat steps 3 and 4 on the second calibration point.
8) Use the
key and the
key to adjust the displayed thickness up or down, until it matches the
thickness of the sample piece.
*you will not see 2OF2 on display.
9) Press
the
key, so that The M/S (or IN/
μ
S) symbols are flashing. The gauge will now display the sound
velocity value it has calculated based on the thickness values that were entered in step 6.
10) Press the
key once more to exit the calibration mode. The gauge is now ready to perform
measurements within this range.
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