Title :
Adaptive current sources and feedback applied to the cryogenic current comparator
Author :
Wood, B.M. ; Schumacher, B.
Author_Institution :
Inst. for Nat. Meas. Stand., Nat. Res. Council of Canada, Ottawa, Ont., Canada
fDate :
June 27 1994-July 1 1994
Abstract :
A novel current source for the cryogenic current comparator (CCC) is presented which is adaptable to many coil, resistance and filtering configurations. The effect of both current feedback from the SQUID and voltage feedback from the detector are examined and incorporated into the design. The advantages of the new system are examined in terms of flux tracking, leakage, self checking, accuracy and flexibility. The system has been used at NRC over the resistance range of 1 /spl Omega/ to 1 M /spl Omega/.<>
Keywords :
SQUIDs; adaptive systems; comparators (circuits); constant current sources; electric resistance measurement; low-temperature techniques; 1 ohm to 1 Mohm; SQUID; accuracy; adaptive current sources; coil; cryogenic current comparator; current feedback; detector; filtering; flexibility; flux tracking; leakage; resistance; self checking; voltage feedback; Bandwidth; Batteries; Bridge circuits; Coils; Cryogenics; Feedback; Feeds; Filtering; SQUIDs; Voltage;
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.1994.333258
