Title :
The Reproduction of the As-Maintained Unit of Voltage at IEN by Means of 2e/h
Author :
Andreone, Domenico ; Arri, Ernesto ; Lacquaniti, Vincenzo ; Marullo, Giancarlo
fDate :
3/1/1983 12:00:00 AM
Abstract :
The IEN participates in the joint venture of the national standardizing laboratories which reproduce the as-maintained unit of voltage by means of the fundamental constant 2e/h. In this paper, the adopted long-life thermally cyclable junctions with Nb-base electrodes are described. Also, the apparatus, procedures, and measurements used to monitor the unit of voltage at IEN during recent years are outlined. The results indicate a small positive drift of about 6 à 10-8 per year for VIEN-69; on January 1, 1980 they gave the relation 2e/h = (483 594.41 ± 0.1) GHz/VIEN-69.
Keywords :
Electrodes; Fabrication; Frequency measurement; Insulation; Josephson effect; Laboratories; Length measurement; Niobium; Temperature; Voltage;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.1983.4315057