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New cryogenic current comparator-based resistance comparison bridge at lne

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5 Author(s)
Soukiassian, L. ; Quantum Metrol. Group, Lab. Nat. de Metrol. et d''Essais (LNE), Trappes, France ; Spengler, G. ; Leprat, D. ; Schopfer, F.
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A new resistance comparison bridge is being built at LNE to ensure the ohm traceability in terms of the quantum Hall effect (QHE) with a target uncertainty of some parts in 1010. We describe the instrument, the performance of which relies on the development of a couple of versatile and well synchronized current sources, an accurate and stable current divider and a cryogenic current comparator (CCC) having a low noise of 84 pA.t/Hz1/2 .

Published in:

Precision Electromagnetic Measurements (CPEM), 2010 Conference on

Date of Conference:

13-18 June 2010