2008•Unpublished venueRequires access
UK comparison of 1 kg magnetic stainless steel weights.
James Berry, Simon Davidson, Andrew D. Burrows, Andy Chapman, L Coben-Gipps, Paul Goddard, Catherine Jenkins, Matthew B. Parkinson, Andrew Taylor
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Abstract
This report summarises the results of a UK comparison of 1 kg magnetic stainless steel weights carried out between nine laboratories. It is well known that a weight with high magnetic susceptibility and/or permanent magnetisation can alter the reading displayed by a mass balance leading to a potential for error in the weight’s calibration. This report investigates whether the measurement of the magnetic properties of stainless steel weights should form part of a laboratory’s conventional mass calibration routine. All of the participants’ conventional mass values agree within their quoted uncertainties with the median conventional mass, with the exception of the most magnetic weight (“X” cylinder) by one laboratory. At OIML E2 class uncertainty and below, the results indicate that routine measurement of the magnetic properties of weights is not necessary for conventional mass calibrations.