Measuring Parameter - BAQ alphaDUR mini Manual

MEASUREMENT
To avoid this effect, the specimen has to be thick enough to allow the os-
cillations to attenuate before the diamond is reached. With thin speci-
men, the mass of the specimen has an effect. If the mass of the speci-
men is high enough, a thickness of 8 mm for flat specimen or 10 mm for
round stock is sufficient. If a specimen does not meet these require-
ments, it can be acoustically coupled to a massive support e.g. with a
thin oil film between specimen and support. A steel plate is recommen-
ded as support (e.g. the precision stand comes with an appropriate
plate).
Small, irregular shaped parts can be embedded in plastic material.

Homogeneity
As in optical Vickers hardness tests, the indentations are relative small.
Therefore the homogeneity of the specimen can possibly influence the
measurement results. To achieve reproducible hardness readings, the in-
dentation must be significantly greater than the grain size of the test ma-
terial. This may be not the case for some cast material even with a test
load of 100N.

5.2 Measuring parameter

The measuring parameter must be set according to the demands. The
parameter are in particular:
These parameter are described in detail in chapter 6.2. Select the menu item
Measuring parameter/Edit to adjust them. If a set of measuring parameter that
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Material
Hardness scale
Rating
Statistics
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