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
11th HARDMEKO Conference: HARDMEKO 2010 (together with 21st TC3 Conference on Measurement of Force, Mass and Torque and 2nd TC22 Meeting on Vibration Measurement)
