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

Author

Hwang, Gwo-Jen ; Chien, Shih-Sen ; Chen, Chun-Chun ; Ma, Li-Jehn ; Chan, Jiing-Ching

Author_Institution

Nat. Meas. Lab., Centere for Meas. Stand., Hsinchu, Taiwan

Volume

42

Issue

2

fYear

1993

fDate

4/1/1993 12:00:00 AM

Firstpage

227

Lastpage

230

Abstract

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

Keywords

Josephson effect; measurement standards; voltage measurement; 1 V; 1991; China; ETL; Germany; Japan; Josephson-array voltage standard; NIST; NML; NPL; National Measurement Laboratory; PTB; UK; USA; Zener references; international comparisons; national laboratories; transfer standards; Atomic clocks; Hardware; Helium; Laboratories; Measurement standards; Microwave oscillators; NIST; Tail; Thermal conductivity; Voltage;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.278554

Filename

278554