ElektroPhysik
E-13
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.
5.3
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.
Make sure the MINITEST 403 is on.
2.
Perform a Probe-Zero (refer to section „Probe
Zero“)
3.
Apply couplant to the sample piece.
4.
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
Stability Indicator should have nearly all its bars
on.
5.
Having achieved a stable reading, remove the
transducer. If the displayed thickness changes
from the value shown while the transducer was
coupled, repeat step 4.
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 Probe key. The display will flash 1OF2.
Repeat steps 3 through 8 on the second
calibration point. The MINITEST 403 will now
display the sound velocity value it has calculated
based on the thickness values that were entered
in step 7.
9.
The MINITEST 403 is now ready to perform
measurements.
Two Point Calibration
