Recent Determinations of RH in Terms of /spl Omega/60-BI

Abstract

A system based on a cryogenic current compa-now used to measure the quantized Hall resistance & in terms of 269-BI, the BIPM representation of the ohm, with an uncertainty of 1,4 x lo-'*.This measurement system and the former potentiometric one are in good agreement within their combined uncertainties (5,l x lo-*).