Title :
Progress in linking the Farad and the RK value to the SI units at BNM-LCIE
Author :
Trapon, Gérard ; Thévenot, Olivier ; Lacueille, Jean-Claude ; Poirier, Wilfrid ; Fhima, Haim ; Genevès, Gérard
Author_Institution :
BNM-LCIE, Fontenay aux Roses, France
fDate :
4/1/2001 12:00:00 AM
Abstract :
A calculable capacitor and a quadrature bridge are used at the Bureau National de Metrologie-Laboratoire Central des Industries Electriques to link the unit of capacitance and the RK value to the SI units. Re-evaluation of the frequency effect of the calculable capacitor and modifications to its movable guard-guiding system have improved the results of these two direct determinations. The measured value of the von Klitzing constant is: RK=RK-90(1+4.1×10-8), with 1σ uncertainty of 5.3 in 108
Keywords :
bridge instruments; capacitance measurement; units (measurement); BNM-LCIE; Farad; RK value; SI units; calculable capacitor; capacitance; frequency effect; movable guard-guiding system; quadrature bridge; von Klitzing constant; Bars; Bridge circuits; Capacitance measurement; Capacitors; Electrical resistance measurement; Equations; Frequency measurement; Joining processes; Resistors; Voltage;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
