Extensive Comparison between INRIM and a Secondary Calibration Laboratory using a Multifunction Electrical Calibrator

Abstract

An accurate and extensive Inter-laboratory comparison between the laboratory for the calibration of multifunction electrical instruments of the National Institute of Metrology Research (INRIM) and a secondary high level electrical calibration laboratory was performed with satisfactory results. The instrument involved in the comparison was a top class multifunction calibrator, chosen for its wide measurement fields and its excellent definability requiring sensitively small uncertainties to calibrate it. The relevancy of this work is that for the first time at INRIM, a ILC involving a grid of about one hundred and thirty measurement points was carried out. This ILC allowed to exhaustively check the measurement capabilities and exploit the measurement techniques of the secondary laboratory. Attention was also paid to individuate the correlated uncertainty components between the two laboratories measurements. The calibrator resulted adequate to verify the capabilities of high level secondary electrical calibration laboratories, better