Article1974

New NBS Measurements of the Absolute Farad and Ohm

68 citations0/0 files storedIEEE Transactions on Instrumentation and Measurement

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Scientific Measurement and Uncertainty Evaluation Calibration and Measurement Techniques Advanced Electrical Measurement Techniques

Abstract

A recently completed calculable cross capacitor in conjunction with a previously described collection of ac and dc bridges has made possible a highly accurate measurement of the farad and the ohm. The cross capacitor and its auxiliary equipment, as well as those components of the measurement system which have not been covered in prior publications, are described in detail. The measurements indicate that the National Bureau of Standards (NBS) unit of capacitance is given by FNBS = 1 F + 1.787 μF, and that the NBS unit of resistance is given by ;Ω NBS = 1 Ω - 0.819 μΩ.

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References

1965A Calculable Standard of Capacitance 1968An Absolute Determination of Resistance Based on a Calculable Standard of Capacitance

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1998Determination of the von Klitzing constant and the fine-structure constant through a comparison of the quantized Hall resistance and the ohm derived from the NIST calculable capacitor 1979A Measurement of the Gyromagnetic Ratio of the Proton in a Strong Magnetic Field 1988Fundamental Physical Constants 1989New realization of the ohm and farad using the NBS calculable capacitor 2019The quantum Hall effect in the era of the new SI 1989Determination of the time-dependence of Omega /sub NBS/ using the quantized Hall resistance 2001Hysteresis and related error mechanisms in the NIST watt balance experiment 2015An Initial Reproduction of SI Capacitance Unit From a New Calculable Capacitor at NIM

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