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Two new calculable cross capacitors are being constructed by the National Measurement Institute of Australia and the Bureau International des Poids et Mesures, with the aim of limiting sources of uncertainty to 1 nF/F, where achievable. In particular, the main electrodes, which are four stainless steel bars 470 mm long and 50 mm in diameter, must be geometrically accurate to 100 nm. An automated system...
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