G Trapon et al 2003 Metrologia 40 159 doi:10.1088/0026-1394/40/4/304
G Trapon, O Thévenot, J C Lacueille and W Poirier
Show affiliationsThe von Klitzing constant RK has been previously determined at the Bureau National de Métrologie (BNM) in 1986 and 1993. Considering the recommendation of the Comité Consultatif d'Electricité working group on the quantum Hall effect in 1988, as well as the differences between the values of the fine structure constant obtained from different methods, it appears to be particularly important that we continue to develop and improve the direct determinations of RK.
Since 1993, the BNM calculable capacitor, comparison bridges and transfer standards have been considerably modified and the value was determined anew in 1999–2000. The result is RK = RK−90×(1 + 4.1 × 10−8) (1σ = 5.3×10−8)
This paper describes the different investigations, modifications and characterizations of the measurement chain elements that were carried out during the last fifteen years in order to obtain this result.
Issue 4 (August 2003)
Received 24 January 2003
Published 13 June 2003
G Trapon et al 2003 Metrologia 40 159
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