Abstract
We re-examine the nonlinearity of the National Institute of Standards and Technology, Gaithersburg, MD, USA calculable capacitor (CC) which is used for realizing the capacitance unit. The dominant error originates from the electrode nonuniformity. We use a boundary perturbation technique to develop a convolution method for estimating capacitance nonlinearity due to the electrode nonuniformity. We conclude that an improved accuracy can be achieved by avoiding the end effect and operating the CC in a shortened range from 0.2 to 0.6 pF.
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