National Physical Laboratory

Jonathan Williams


Jonathan Williams

Jonathan Williams joined NPL in 1983 with a degree in Physics from Oxford University. Since 1988 he has been working on the application of cryogenic techniques to electrical metrology. He has developed a number of cryogenic current comparator systems including resistance ratio bridges for the quantised Hall effect as well as resistance standards operating at currents from 100 A to 100 nA. More recently he has been developing measurement systems for the direct synthesis of voltage waveforms in terms of the Josephson effect.

Jonathan is a Fellow of the Institution of Engineering and Technology, a Chartered Engineer and a Liveryman of the Worshipful Company of Scientific Instrument Makers. In 2011, he was awarded a PhD from City University for his thesis 'Realisation of quantum standards for electrical metrology and their role in the SI'.


Jonathan is the chairman of the Working Group on Low Frequency Quantities (WGLF) of the Consultative Committee for Electricity and Magnetism (CCEM).

Selected publications

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Contact details

Tel: 020 8943 6376

Last Updated: 5 Mar 2015
Created: 15 Dec 2010


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