engleski

Inter-laboratory Comparison of the Electrical Reference Standards of FEIT-Skopje and FER-Zagreb

In the paper two procedures of inter-laboratory comparisons of the electrical reference standards (resistance and DC voltage) of the Metrological Calibration Laboratory of the Faculty of Electrical Engineering and Information Technologies in Skopje (FEIT), R. Macedonia and the Primary Electromagnetic Laboratory at Faculty of Electrical Engineering and Computing in Zagreb (FER), R. Croatia will be described. An original improved resistance comparison method, developed by R. Malaric is used for the resistance comparison, as well as an expanded model for uncertainty estimation. The improvement of the model and uncertainty estimation is considered referring to the Example S3, shown in EA-4/02 publication. By comparison it is shown how the used method and model improve the quality of the resistance calibration. The paper presents also the inter-comparison of reference DC voltage standards of the both laboratories. The inter-comparison was done by a new automatic system, which contains self-developed 16 channel low-thermal switch and digital nano-voltmeter, controlled by the computer, using an optimized procedure, and control software in LabVIEW. The results of the intercomparison are discussed.

interlaboratory comparison; resistance standards; voltage standards

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