E-12
ElektroPhysik
6.
Press the CAL key. The MM (or IN) symbol should
begin flashing.
7.
Use the UP and DOWN arrow keys to adjust the
displayed thickness up or down, until it matches
the thickness of the sample piece.
8.
Press the CAL key again. The M/s (or IN/ms)
symbols should begin flashing. The MINITEST
403 is now displaying the sound velocity value it
has calculated based on the thickness value that
was entered in step 7.
9.
Press the CAL key once more to exit the
calibration mode. The MINITEST 403 is now rea-
dy to perform measurements.
5.2
Calibration to a known velocity
Note:
This procedure requires that the operator know the
sound-velocity of the material to be measured. A table
of common materials and their sound-velocities can be
found in Appendix C.
1.
Make sure the MINITEST 403 is on.
2.
Press the CAL key to enter calibration mode. If
the MM (or IN) symbol is flashing, press the CAL
key again, so that the M/s (or IN/ms) symbols
are flashing.
3.
Use the UP and DOWN arrow keys to adjust the
displayed velocity up or down, until it matches the
sound-velocity of the material to be measured.
4.
Press the CAL key once more to exit the
calibration mode. The MINITEST 403 is now rea-
dy to perform measurements.
Note:
At any time during the calibration procedure (MM, IN,
M/s, or IN/ms flashing in the display), pressing the PRB-
0 key will restore the gauge to the factory default sound-
velocity for steel (5920m/s / 0.233 IN/ms).
To achieve the most accurate measurements possible,
it is generally advisable to always calibrate the MINI-
TEST 403 to a sample piece of known thickness. Mate-
rial composition (and thus, its sound-velocity) sometimes
varies from lot to lot and from manufacturer to
Calibration to a Known Velocity
