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Rev Sci Instrum. 2014 Apr;85(4):044701. doi: 10.1063/1.4869240.

Precision high-value resistance scaling with a two-terminal cryogenic current comparator.

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  • 1Centro Nacional de Metrología, Querétaro 76900, Mexico.
  • 2Instituto Nacional de Tecnología Industrial, San Martin, Buenos Aires B1650WAB, Argentina.
  • 3National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8171, USA.


We describe a cryogenic two-terminal high-resistance bridge and its application in precision resistance scaling from the quantized Hall resistance (QHR) at RH = RK/2 = 12 906.4035 Ω to decade resistance standards with values between 1 MΩ and 1 GΩ. The design minimizes lead resistance errors with multiterminal connections to the QHR device. A single variable voltage source and resistive ratio windings are utilized to achieve excellent dynamic stability, which is not readily obtained in low-current measurements with conventional cryogenic current comparators (CCCs). Prototypes of this bridge have been verified by a successful international comparison of high-resistance scaling using two-terminal CCCs in the national metrology institutes of Argentina, Mexico, and the United States.

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