Summary of international comparisons of as-maintained units of voltage and values of 2e/h

Journal Article · Wed Nov 01 04:00:00 EST 1972 · IEEE Trans. Instrum. Meas.; (United States)

DOI:https://doi.org/10.1109/TIM.1972.4314034· OSTI ID:6730495

Eicke, Jr, W G; Taylor, B N

Using temperature-regulated transportable standard-cell enclosures, the National Bureau of Standards (NBS), under the auspices of the Bureau International des Poids et Mesures (BIPM), during the period June 1971 through June 1972 has carried out a series of direct comparisons of the units of voltage as-maintained by NBS and BIPM, Sevres, France; the National Physical Laboratory, United Kingdom; the National Research Council, Canada; the National Standards Laboratory, Australia; and the Physikalisch-Technische Bundesanstalt, Germany. The main purpose of these comparisons was to provide a sound basis for intercomparing values of 2e/h obtained at the various national laboratories via the ac Josephson effect in superconductors. It was found that when converted to a common unit of voltage, most measured values of 2e/h agreed with each other to within the 1 to 2 parts in 10/sup 7/ estimated uncertainty. 12 references.

• Research Organization: National Bureau of Standards, Gaithersburg, MD
• OSTI ID: 6730495
• Journal Information: IEEE Trans. Instrum. Meas.; (United States), Journal Name: IEEE Trans. Instrum. Meas.; (United States) Vol. IM-21:4; ISSN IEIMA
• Country of Publication: United States
• Language: English

Related Subjects

656102* -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CALIBRATION STANDARDS
ELECTRIC POTENTIAL
FUNDAMENTAL CONSTANTS
JOSEPHSON EFFECT
STABILITY
STANDARDS
SUPERCONDUCTORS