SEDL / STP / STP722-EB / STP27582S

High-Accuracy Conductivity Measurements in Nonferrous Metals

Free, G
Research physicist, National Bureau of Standards, Department of Commerce, Washington, D.C.,

Pages: 8    Published: Jan 1981

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Abstract

An eddy-current instrument has been built that measures electrical conductivity with a high degree of accuracy and precision. The instrument measures the electrical conductivity of nonferrous metals at a constant skin depth. By keeping the product ωσ constant in all measurements, a linear relationship between conductivity and frequency can be established. Due to this linear relationship, only one conductivity standard is necessary to calibrate the instrument over the full range of 1 to 100 percent international annealed copper standard (IACS).