2017. Vol.20. 3, pp. 54–57
Electrical Conductivity Measurement Non-Ferrous Metal: Instruments and Metrological Assurance
To the two primary standards - NIST national standard (USA) and NPL AC conductivity standard (UK) - used everywhere, the traceability of the majority of foreign specific conductivity measures is provided, the assignment of which is carried out using the eddy current phase method. In the Russian Federation, measures SO-230 are issued, the assignment of which is based on the van der Pau theorem, traceability of measures to primary standards of electrical resistance and length is ensured.
Conclusions. To ensure the reliability of measurement of foreign specific conductivity with the use of eddy current meters, it is necessary to take into account the features of their design and operation algorithms. Verification of eddy current gauges should be carried out using measure СО-230, with a basic relative error of ± 1% and traceability to primary measurement standards specific conductivity and length without the use of a primary specific conductivity reference standard.
Keywords: electrical conductivity, eddy current, accuracy of measurements, conductivity standards.