Title :
Study of cryogenic current comparators with different SQUIDs
Author :
Chih-Ping Liang ; Piquemal, F. ; Geneves, G.
Author_Institution :
BNM/LCIE, Fontenay-aux-Roses, France
fDate :
June 27 1994-July 1 1994
Abstract :
This paper describes the recent study of improvements of resistance bridges based on cryogenic current comparators at BNM/LCIE. Two new cryogenic current comparators were built with different commercial SQUIDs (RF, UHF and DC). Their current sensitivities and sources of noise are investigated. In addition, a direct comparison technique is developed to check large ratios of windings with a measurement uncertainty better than one part in 10/sup 9/(1/spl sigma/).<>
Keywords :
SQUIDs; bridge circuits; bridge instruments; comparators (circuits); electric resistance measurement; electron device noise; low-temperature techniques; DC SQUIDs; RF SQUIDs; UHF SQUIDs; cryogenic current comparators; current sensitivities; measurement uncertainty; noise sources; resistance bridges; winding ratios; Cryogenics; Current measurement; Electrical resistance measurement; Measurement standards; Measurement uncertainty; Noise measurement; Radio frequency; SQUIDs; Superconducting device noise; UHF measurements;
Conference_Titel :
Precision Electromagnetic Measurements, 1994. Digest., 1994 Conference on
Conference_Location :
Boulder, CO, USA
Print_ISBN :
0-7803-1984-2
DOI :
10.1109/CPEM.1994.333257
