Title :
A cryogenic current comparator bridge for resistance measurements at currents of up to 100 A
Author :
Williams, Jonathan M. ; Kleinschmidt, Peter
Author_Institution :
Centre for Electromagn. Metrol., Nat. Phys. Lab., Teddington, UK
fDate :
4/1/1999 12:00:00 AM
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 forms the basis of a resistance ratio bridge for low value resistors with a relative uncertainty of approximately 10-7 or better
Keywords :
SQUIDs; bridge circuits; current comparators; electric resistance measurement; measurement standards; 100 A; DC ratio standard; SQUID coupled; cryogenic current comparator bridge; electric resistance measurement; low value resistors; maximum current capacity; relative uncertainty; resistance ratio bridge; Bridges; Cryogenics; Current measurement; Detectors; Electrical resistance measurement; Resistors; SQUIDs; Superconducting filaments and wires; Type II superconductors; Wounds;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
