Title :
A cryogenic current comparator resistance ratio bridge for the range 10 k/spl Omega/ to 1 G/spl Omega/
Author :
Fletcher, N.E. ; Williams, J.M. ; Janssen, T.J.B.M.
Author_Institution :
Nat. Phys. Lab., Teddington, UK
Abstract :
A cryogenic current comparator with a potential current noise of 1 fA//spl radic/Hz has been built. The comparator will provide accurate current ratios for a new high resistance bridge, using a novel method of balancing two currents from a single source.
Keywords :
bridge instruments; current comparators; electric resistance measurement; low-temperature techniques; 10 kohm to 1 Gohm; cryogenic current comparator; current balancing; current noise; current ratios; high resistance bridge; resistance ratio bridge; Bridge circuits; Cryogenics; Current measurement; Electrical resistance measurement; Magnetic noise; Noise measurement; Resistors; SQUIDs; Superconducting coils; Superconducting device noise;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2000 Conference on
Conference_Location :
Sydney, NSW, Australia
Print_ISBN :
0-7803-5744-2
DOI :
10.1109/CPEM.2000.851093
