Abstract
A resistance ratio bridge using a cryogenic current comparator (CCC) with a dc superconducting quantum interference device (dc-SQUID) was developed. Its structure, driving circuit and principle of operation were based on those of a resistance ratio bridge using a CCC with a commercially available rf-SQUID. Because of the small intrinsic noise of the dc-SQUID, its resolution was determined not by the dc-SQUID noise but by the thermal noise of the resistor being tested. The ratio of a resistor having a nominal resistance of 100 Ω and a resistor with that of 1 Ω was measured with an uncertainty of 1.1×10-8.
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