Comparative measurements of seven standard weights
Comparative measurements of seven standard weights
Adriana VÂLCU, National Institute of Metrology
Interlaboratory comparison consists in intercomparison of measurement results of a laboratory and a reference laboratory which is the country’s highest authority for the measurement concerned.

The aim of an interlaboratory comparison is to verify the competence of accredited or nonaccredited laboratories, including verification of the reported measurement uncertainties, whenever possible.

This paper reports the results of measurements performed on seven standard weights by 15 metrology laboratories throughout Romania. The goal of the Inter-laboratory’s measurements was to provide verification of each participating laboratory’s measurement capability by obtaining a measurement that agrees with the Pilot Laboratory.

The comparison began in 2005 and concluded in 2006, National Institute of Metrology (INM) acting as a pilot (coordinating) laboratory for the program.

As traveling artifacts were used the next standard weights:10 kg, 1 kg, 500 g, 200 g, 100 g, 20 g and 100 mg.

The laboratory’s results are presented for each weight and uncertainty declared. The paper describes the analyzed results using En values (the normalized error used by accreditation bodies) and also the analysis of the results using a reference value (RV-as median ) and degrees of equivalence of each participant with respect to this RV.