Title :
High resistance scaling from 10 kΩ and QHR standards using a cryogenic current comparator
Author :
Elmquist, R. ; Jones, G.R., Jr. ; Pritchard, B. ; Bierzychudek, M. ; Hernandez, F.
Author_Institution :
Nat. Inst. of Stand. & Technol., Gaithersburg, MD
Abstract :
We describe a cryogenic current comparator (CCC) bridge for resistance scaling that provides improved measurement uncertainty over a range of resistance values from 100 kOmega to 1 GOmega. This CCC is designed for high resistance scaling based directly on a quantized Hall resistance (QHR) standard as well as comparisons of resistance ratios of 1, 10 and 100. The QHR-to-decade-value winding ratio offset is chosen so as to approximately cancel the offset produced by resistive decade windings.
Keywords :
cryogenics; current comparators; electric resistance measurement; measurement standards; measurement uncertainty; cryogenic current comparator bridge; measurement uncertainty; quantized Hall resistance; resistance scaling; resistance values; resistive decade windings; winding ratio offset; Bridge circuits; Cryogenics; Electric resistance; Electrical resistance measurement; Feedback; Measurement standards; NIST; Resistors; SQUIDs; Voltage;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2008. CPEM 2008. Conference on
Conference_Location :
Broomfield, CO
Print_ISBN :
978-1-4244-2399-6
Electronic_ISBN :
978-1-4244-2400-9
DOI :
10.1109/CPEM.2008.4574756
