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Measurement Techniques for Evaluating Current Range Extenders from 1 Ampere to 3000 Amperes

Abstract: When measuring standard resistors at different ratios with a direct current comparator (DCC) incorporating current range extenders (CREs), it can be difficult to determine if the measurements are correct and to evaluate measurement uncertainty. This technical note discusses techniques developed at the National Institute of Standards and Technology (NIST) for measuring a set of low value resistors at the same current using different ratios. The design of modern automated DCCs allows measurement currents up to about 150 mA and DCCs can operate at 1:10 ratios with uncertainties well below one part in 106. Higher currents require CREs with ratios from 1:10 to 1:100,000 or more. The techniques described here allow low uncertainties to be obtained by measuring high quality medium current resistors at different power levels, so that they can be used as standards when measuring high current resistors. These techniques also allow you to determine if your CRE is functioning properly.