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Errors due to magnetic effects in 1 kg primary mass comparators

Authors
Journal
Measurement
0263-2241
Publisher
Elsevier
Publication Date
Volume
40
Identifiers
DOI: 10.1016/j.measurement.2006.02.002
Keywords
  • Magnetism
  • Magnetic Susceptibility
  • Mass Standards
  • Stainless Steel
Disciplines
  • Law

Abstract

Abstract A revised draft of OIML Recommendation 111 has been approved recently. Among the many notable changes to the previous edition are specific requirements for both the magnetic susceptibility and residual magnetization of weights used in legal metrology. The highest class of such weights is E 1, for which a 1 kg weight has a manufacturing tolerance of ±0.5 mg. It therefore follows that better magnetic properties might be needed for weights having mass uncertainties substantially better than E 1 tolerances. The work presented below shows how this problem was approached at the BIPM and supports our conclusion that alloys meeting the new Class E 1 specifications for 1 kg weights have magnetic properties sufficient for the needs of the BIPM.

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