National Physical Laboratory

Design Considerations for a CCC Bridge with Complete Digital Control

Further Information

Published: 30 September 2010

Authors: Jonathan Williams, G. Rietveld, E Houtzager, JT Janssen

Related: Quantum Phenomena


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Controlled Cryogenic Comparator (CCC) bridges are used in top-level measurements of resistance.

This poster explains the development of a completely digitally controlled CCC resistant rotary bridge that enables accurate resistance measurements to be made at NPL. The only external influence on the bridge is a fundamentally inevitable noise source, by definition impossible to avoid, which comes from a nanovolt amplifier.

Last Updated: 12 May 2014
Created: 10 Feb 2011

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