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Automation of direct josephson voltage standard comparison and an application

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1 Author(s)
Tang, Y. ; Nat. Inst. of Stand. & Technol., Gaithersburg, MD, USA

A direct Comparison between two Josephson Voltage Standard (JVS) systems has been used in the Bureau International des Poids et Mesures (BIPM) key comparisons or regional supplementary comparisons to verify the performance of a JVS with an uncertainty of few parts in 1010. Most direct JVS comparisons were manually operated. Hardware and protocol for an automatic direct JVS comparison have been developed to improve the efficiency while retaining the same level of uncertainty attained from a manual comparison. The automatic JVS direct comparison greatly improves the efficiency of data acquisition. A case study examining the offset related to digital voltmeter (DVM) polarity in an automatic direct JVS comparison is presented.

Published in:

Precision Electromagnetic Measurements (CPEM), 2010 Conference on

Date of Conference:

13-18 June 2010

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