Precision high-value resistance scaling with a two-terminal cryogenic current comparator.
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.
Centro Nacional de Metrología, Querétaro 76900, Mexico.
F L
FL
Hernandez-Marquez
Instituto Nacional de Tecnología Industrial, San Martin, Buenos Aires B1650WAB, Argentina.
M E
ME
Bierzychudek
National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8171, USA.
G R
GR
Jones
National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8171, USA.
R E
RE
Elmquist
D017097:Electric Impedance; D055615:Electrical Equipment and Supplies; D005615:Freezing; D008962:Models, Theoretical