Calibration To A Known Velocity; Two-Point Calibration - sauter TN-US Instruction Manual

6) The and the
until the thickness of the sample piece is matched.
7) The key has to be pressed again. The M/S (or IN/µS) should start flashing. Now
the sound velocity value, which has been calculated based on the thickness value
that was entered, is displayed.
8) The key has to be pressed again to exit the calibration mode and return to the
measurement mode.
The instrument is now ready to perform measurements.

4.3.2 Calibration to a known velocity

Note: This procedure requires that the sound velocity of the material being meas-
ured, is known. A table of the most common materials and their sound velocities can
be found in Appendix A of this manual.
1) The key is to be pressed to activate the calibration mode. The MM (or IN) sym-
bol should start flashing.
2) The key is to be pressed again, so that the symbols
M/S (or IN/µS) are flashing.
3) The and the
until it matches the sound velocity of the material being measured. The
also be pressed to switch among the pre-set, commonly used velocities.
4) To quit the calibration mode, the key
ready to perform measurements.
To achieve the most accurate measurement results, it is generally advisable to cali-
brate the instrument to a sample piece of known thickness. The composition of mate-
rials (and thus, its sound velocity) sometimes varies from lot to lot and from manufac-
turer to manufacturer.
Calibration to a sample of known thickness ensures that the instrument is set as
closely as possible to the sound velocity of the material being measured.

4.3.3 Two-point Calibration

Note: This procedure requires that the testing person has got two known thickness
points on the test piece which are representative of the range being measured.
1) A Zero adjustment has to be performed.
2) A couplant has to be applied to the sample piece.
3) The transducer has to be pressed against the sample piece at the first / second
calibration point. It has to be made sure that the transducer is placed flat on the sur-
face of the sample. Now the display should show any (probably incorrect) thickness
value and the coupling status indicator should appear steadily.
4) As soon as a stable measurement is achieved, the transducer is to be removed. If
the displayed thickness distinguishes from the value shown while the transducer was
coupled, step 3 is to be repeated.
5) The key is to be pressed. The MM (or IN) symbol should start flashing.
TN_US-BA-e-1814
key has to be used to adjust the displayed thickness up or down
key have to be used to adjust the sound velocity up and down
has to be pressed and the instrument is
key can
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