Dakota Ultrasonics
14
Calibration to a known thickness
NOTE: This procedure requires a sample piece of the specific
material to be measured, the exact thickness of which is known,
e.g. from having been measured by some other means.
1) Make sure the
PR-8
2
is on.
2) Perform a Probe-Zero (refer to page 12)
3) Apply couplant to the sample piece.
4) Press the transducer against the sample piece, 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
IN
(or
MM
) 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
IN/
s
(or
M/s
) symbols should
begin flashing. The
PR-8
2
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
PR-8
2
is now ready to perform measurements.
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