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The BIPM flexure-strip balance FB-2

A Picard

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A mass comparator for 1 kg weights has been designed and built at the BIPM based on our experience with a prototype flexure-strip balance named FB-1. The flexure-strip balance FB-2 is fully automated and mainly used for research. It consistently achieves a repeatability of weighings in air or in vacuum of 1 kg artefacts at least ten times better than that obtainable with the best knife-edge balances. The aim of this paper is to describe the design and capabilities of the FB-2, drawing on theoretical studies already published. Finally, results obtained with the FB-2 are given to illustrate its metrological possibilities.


PACS

06.30.Dr Mass and density

07.10.Lw Balance systems, tensile machines, etc.

Subjects

Instrumentation and measurement

Dates

Issue 4 (August 2004)

Received 18 February 2004

Published 30 June 2004



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