Cryogenic current comparator bridge with dual SQUID detectors

Williams, J.M., Patel, P.D., Holubar, T., Good, J.

Precision Electromagnetic Measurements（2014）

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摘要

The cryogenic current comparator (CCC) resistance ratio bridge provides a high accuracy over a wide range of practical resistance values. Its performance is critically dependent on the choice of detector used to achieve a voltage null in the bridge. The necessary combination of low input current and voltage noise is not widely available in commercial instruments. A SQUID is a competitive device as a voltage null detector when matched to the resistors being compared. This paper describes a CCC bridge for resistors in the range 1 Ω to 10 kΩ, as well as quantized Hall resistance plateaux, employing two SQUIDS, one for current balance and one for voltage balance.

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关键词

SQUIDs,bridge circuits,circuit noise,cryogenic electronics,current comparators,electric current measurement,electric noise measurement,electric resistance measurement,electric sensing devices,resistors,voltage measurement,CCC resistance ratio bridge,cryogenic current comparator resistance ratio bridge,current balance,dual SQUID detector,input current noise,quantized Hall resistance plateaux,resistance 1 ohm to 10 kohm,resistor,voltage balance,voltage noise,voltage null detector,Resistance measurement,SQUID,cryogenic current comparator,

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