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

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

Abstract

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.

MeSH terms

  • Electric Impedance
  • Electrical Equipment and Supplies*
  • Freezing*
  • Models, Theoretical*