Establishing a Josephson-array voltage standard system at NML, ROC

A 1-V Josephson-array voltage standard system has been operational at the National Measurement Laboratory (NML) of the Center for Measurement Standards (CMS) in the Republic of China (ROC). To help evaluate its accuracy, the authors selected two Zener references that had been calibrated by means of...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 1993-04, Vol.42 (2), p.227-230
Main Authors: Hwang, Gwo Jen, Chien, Shin-Sen, Chen, Chun-Chun, Ma, Li-Jehn, Chan, Jiing-Ching
Format: Article
Language:English
Subjects:
Applied sciences
Atomic clocks
Electronics
Exact sciences and technology
Hardware
Laboratories
Measurement standards
Microwave oscillators
NIST
Tail
Testing, measurement, noise and reliability
Thermal conductivity
Voltage
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Summary:A 1-V Josephson-array voltage standard system has been operational at the National Measurement Laboratory (NML) of the Center for Measurement Standards (CMS) in the Republic of China (ROC). To help evaluate its accuracy, the authors selected two Zener references that had been calibrated by means of this system over a three-month period and hand-carried them to four other national laboratories around the world for comparison purposes. Over a four-week period in November and December, 1991, these two references were measured in turn at PTB (Germany), NPL (UK), NIST (USA), and ETL (Japan). The results of these international comparisons at the 1-V level, using the Zener references as transfer standards, shows good agreement to about 0.05 ppm between NML (ROC) and the other national laboratories.< >
ISSN:0018-9456
1557-9662
DOI:10.1109/19.278554