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TitleDirect determination of capacitance standards using a quadrature bridge and a pair of quantized Hall resistors
Publication TypeJournal Article
Year of Publication2003
AuthorsInglis, A.D., Wood B.M., Côté M., Young R.B., and Early M.D.
JournalIEEE Transactions on Instrumentation and Measurement
Pagination559 - 562
Date Published2003
ISSN00189456 (ISSN)
KeywordsCapacitance, Capacitance measurement, Capacitors, Electric measuring bridges, Hall effect, Hall effect devices, Magnetic fields, Quadrature bridge, Quantized Hall resistors, Quantum theory, Resistors, Stability, Standards
AbstractWe have used a quadrature bridge to compare directly two quantum Hall resistors with two 10-nF capacitors at 1233 Hz. This approach eliminates uncertainties due to thermal and structural instabilities and to ac/dc differences of the wire resistors normally used in an intermediate step. We have measured the capacitative interaction between the devices, and have developed a shielded header to suppress this effect. The value for the National Research Council primary standard 10-pF capacitor obtained by this method agrees with the expected value to within (0.1 ± 3.5)aF, or (0.01 ± 0.35) × 10-6.

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