Abstract
A comparison of quantum Hall effect (QHE) resistance standards has been carried out by taking a complete QHE system from the BIPM to the Laboratoire Primaire d'Electricite-Magnetisme (BNM/LCIE). From December, 14-17, 1993, measurements of the same 100 /spl Omega/ standard resistor were carried out in terms of the quantized Hall resistance (QHR) standards of the two laboratories. This exercise followed a preliminary comparison in July 1993 in which the ratio of the 100 /spl Omega/ standard to a 1 /spl Omega/ standard, and that of the 100 R standard to a 10 k/spl Omega/ standard were measured at the BNM/LCIE using the resistance-ratio bridges of both laboratories. All comparison results agree to within 4 parts in 10/sup 9/. In particular, the values attributed by the two laboratories to the 100 R standard, based on the mean of measurements made on the i=2 plateaus of GaAs-based heterostructures, agreed to (1.2/spl plusmn/3.0) parts in 10/sup 9/. >
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