Study on the high-precision measurement method of electrical resistivity in pure iron with small sample size
Description
The magnitude of the input current influences the measurement of electrical resistivity, and specifically, using a 100 mA input current results in significantly fewer measurement errors than using a 10 mA input current. The repeatability and the accuracy of the electrical resistivity measured in single-current mode are higher than those in dual-current mode.The effect of the sample size on the measurement values of the electrical resistivity is remarkable: the smaller the sample’s width and thickness, the higher the measurement accuracy of the electrical resistivity values.In the same case, the size effect in the thickness direction is more pronounced than that in the width direction.The resistivity measurement errors resulting from the above single or dual-current mode, input current, and size effect can be attributed to more severe dispersion or distortion of the electrical field in the surface layer of the samples during the four-probe measurement.
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Steps to reproduce
A high-precision four-probe resistivity tester (RMS-1000P equipped with Wuhan Bai Libo company) is used to measure electrical resistivity. The accuracy of the measurement resistance value can reach to 10 nΩ.we carefully compare the electrical resistivity measurement values of the high-purity iron (99.99%) at room temperature, which was cut into different thicknesses and widths and measured in the single-current and dual-current modes, to determine the effective measurement mode and to obtain usable correction functions that can remove off the size (thickness and/or width) effect of the resistivity measurement of the pure iron with very small sample size.