Article1965

A Calculable Standard of Capacitance

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Scientific Measurement and Uncertainty Evaluation Electrical and Electromagnetic Research Advanced Electrical Measurement Techniques

Abstract

A calculable standard of capacitance has been constructed in the form of a variable cylindrical cross-capacitor. The value defined by the standard is the change in capacitance due to the linear displacement of one screening electrode relative to another, and this displacement is measured in wavelengths of light (Hg green, λ 5462) by means of a built-in Fabry-Perot interferometer. The capacitance interval has a nominal maximum of 0.25 pF. The estimated accuracy of a capacitance determination by means of the standard is 1 in 10 7 when the value is expressed in e.s.u. The present uncertainty in the value assumed for the velocity of light limits the accuracy of a result expressed in e.m.u. to 1 in 10 6 .

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1968An Absolute Determination of Resistance Based on a Calculable Standard of Capacitance 1974New NBS Measurements of the Absolute Farad and Ohm 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 2007Uncertainty budget for the NIST electron counting capacitance standard, ECCS-1 2001Progress in our knowledge of the fundamental constants of physics 2019The quantum Hall effect in the era of the new SI 2004Fundamental electrical standards and the quantum metrological triangle

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