INTERLABORATORY COMPARISON IN CALIBRATION OF HARDNESS TESTING MACHINES IN TURKEY

摘要

One of the best ways for assuring the quality of the calibration results for accreditedon-accredited laboratories is to participate in interlaboratory comparisons. For this reason TURKAK (Turkish Accreditation Agency) and TUBITAK UME (National Metrology Institute of Turkey) for first time had decided to organize an interlaboratory comparison which was piloted by UME Hardness Laboratory in the field of verification/calibration of hardness testing machines (HTM). Besides UME, 9 accredited laboratories participated in the comparison and E_n numbers for all ranges between pilot and each participating laboratory were evaluated. It was a good practice to see differences between laboratories' uncertainty declarations and applications. In this paper the comparison method and results are explained.