Title :
A cryogenic current comparator bridge for resistance measurements at currents of up to 100 A
Author :
Williams, J.M. ; Kleinscmidt, P.
Author_Institution :
Centre for Electromagn. Metrol., Nat. Phys. Lab., Teddington, UK
Abstract :
The use of cryogenic current comparators at NPL has been limited so far to currents of 100 mA. A new current comparator with a maximum current capacity of 100 A has been developed and will form the basis of a resistance ratio bridge for low value resistors with a relative uncertainty of 10/sup -7/ or better.
Keywords :
bridge circuits; current comparators; electric resistance measurement; measurement standards; 100 A; SQUID; cryogenic current comparator bridge; low value resistors; maximum current capacity; relative uncertainty; resistance measurements; resistance ratio bridge; superconducting shield; winding ratio errors; Bridges; Coils; Cryogenics; Current measurement; Detectors; Electrical resistance measurement; Resistors; SQUIDs; Superconducting filaments and wires; Wounds;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 1998 Conference on
Conference_Location :
Washington, DC, USA
Print_ISBN :
0-7803-5018-9
DOI :
10.1109/CPEM.1998.699838
