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8 Material calibration
The alphaDUR mini has to be calibrated for every material that should be
measured. These calibrations can be stored permanently on the device.
For measurements on samples made of the calibrated material, the
corresponding material calibration must be selected. (Measuring parameter:
Material see chapter 6.1).
In order to convert the measured hardness values to a hardness scale other
than HV (see chapter 7), the material type for the conversion must be selected
during the material calibration. If no material type is selected, the hardness
scale cannot be switched to scales other than HV for measurements with this
material calibration.
When delivered, there are already two material calibrations for steel in the
alphaDUR mini stored. These cannot be overwritten or deleted. They only
differ in the table that has been chosen. Steel DIN is converted according to the
table A1 of DIN EN ISO 18265, Steel ASTM according to table 1 and 2 of
ASTM E140.
The calibrations can be grouped to sections. Like that a two-level hierarchy is
established to keep things clear if lots of calibrations shall be saved. E.g.
ferrous materials and aluminum alloys can be assigned to different sections.
To calibrate a material, select menu item Material calibration / Calibrate. You
will need a material sample of known hardness (reference sample) for the
calibration.
This reference sample must fulfill the following requirements:
•
Sufficient size. Especially the thickness should not be less than 16
mm (as for standard test blocks).
MATERIAL CALIBRATION
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