Measurement of the electric conductivity of highly conductive metals with 4-electrode impedance method
ABSTRACT: Various metals and their alloys can be characterized, among other measures, also by their electrical conductivity value, for DC and AC. Precise measurements on different frequencies can be used to validate metals, their alloys and their mechanical and physical structure. Specially developed instrumentation (hardware and software) for measuring precisely (with error below 1%) the conductivity of specimens with dimensions of 80 mm*80 mm*3 mm is described. The measurement tolerances are estimated by simulations (in COMSOL Multiphysics environment). Also practical measurements with different materials have been carried out in the conductivity range of about 2.5 ... 60 MS/m and frequency range from DC to 100 kHz AC.