CONSIDERATION OF THE UNCERTAINTY OF MEASUREMENT DURING THE CALIBRATION OF HARDNESS TEST MACHINES

Dieter Schwenk

Abstract

The uncertainty of measurement is always characteristic of the test set-up and the test procedure. Only at the end of the calibration the uncertainty of measurement is transferred to the measured object concerning the exactness of the scale design. The problems with the inclusion of the uncertainty of measurement in the conformity according to ISO 17025 at the calibration of material test machines is often founded in the too little number of single measurements, as e.g. at the calibration of the test force on hardness test machines according to ISO 6508. The number of single measurements in the calibration specifications of the test standards should be increased and variably arranged for the particular calibration requirement. The consideration of the uncertainty of measurement is condition of any metrological result evaluation.

Keywords

uncertainty of measurement, limit deviation, ISO 17025

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IMEKO-TC5-2010-023.pdf

DOI

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IMEKO TC

TC5 - Hardness Measurement

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