Cryogenic current comparator bridge for quantum Hall resistance ratio measurements

被引：8
|
作者：
Kleinschmidt, P [1 ]
Williams, JM [1 ]
Fletcher, NE [1 ]
Janssen, TJBM [1 ]
机构：
[1] Natl Phys Lab, Teddington TW11 0LW, Middx, England
来源：
IEE PROCEEDINGS-SCIENCE MEASUREMENT AND TECHNOLOGY | 2002年 / 149卷 / 06期
关键词：
Bridge circuits - Cryogenic equipment - Electric currents - Electric resistance measurement - Electric windings - Hall effect - Quantum electronics - Resistors - SQUIDs;
D O I：
10.1049/ip-smt:20020758
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A cryogenic current comparator (CCC) bridge for quantum Hall resistance ratio measurement has been constructed. Compared to previous CCC systems at the National Physical Laboratory, UK, the new system differs in two aspects. Firstly, it uses a type-II CCC, i.e. the ratio windings are on the outside and the detection winding is on the inside. This has the advantage that the CCC can be made very compact and fits into a standard storage Dewar. Secondly, the bridge electronics uses a digital servo and the SQUID feedback loop is disabled during current reversals. The overall relative measurement uncertainty of the system is of the order of 10(-9).
引用
收藏
页码：302 / 304
页数：3
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