论文信息 - Realization of the farad at BNM-LCIE

Realization of the farad at BNM-LCIE

The BNM-LCIE Thompson Lampard Calculable Capacitance (TLCC) has been taken apart for improvements between 1994 and 1997. Influencing parameters were determined and/or corrected: parallelism of the electrodes, end effects, dimensions of a compensating spike and effect of its lateral displacement. With these improvements and by using a new interferometer, the realization of the farad is achieved with an uncertainty (not taking into account the frequency dependance of the TLCC) equal to 3 10/sup -8/ (1/spl sigma/).

[1] A. M. Thompson,et al. A New Theorem in Electrostatics and its Application to Calculable Standards of Capacitance , 1956, Nature.

[2] W K Clothier,et al. A Calculable Standard of Capacitance , 1965 .

[3] Takashi Igarashi,et al. Determination of an Absolute Capacitance by a Horizontal Cross Capacitor , 1968 .

[4] G. W. Small,et al. A new determination of the quantized Hall resistance in terms of the NML calculable cross capacitor , 1997 .