An international comparison in the pressure range 20 - 100 MPa has been carried out under the auspices of the high-pressure working group of the Comité Consultatif pour la Masse et les grandeurs apparentées (CCM) of the Comité International des Poids et Mesures (CIPM). The Standards Laboratories of 13 countries have participated in this comparison, which took place during the period 1981 - 1985. This paper presents a résumé of the comparison.The transfer standard used was an oil-operated pressure balance. Each laboratory determined the effective area of the piston-cylinder assembly of this balance in the pressure range 20 - 100 MPa. The results of the measurement of the effective area extrapolated to zero applied pressure agreed within 204 parts per million (ppm) for all 13 laboratories (9 laboratories agreed within 53 ppm). The results of the measurement of the effective area at 100 MPa agreed within 414 ppm for all 13 laboratories (8 laboratories agreed within 78 ppm).
The purpose of this paper is to discuss the design and performance of a primary standard barometer and a primary standard pressure balance, and to describe in detail a direct intercomparison between the two instruments within their optimum operating range. The uncertainties associated with each pressure standard are discussed together with an estimate of the uncertainties associated with the intercomparison experiment itself. At a pressure of 100 kPa the two methods agree to within 1.2 k 1.4 Pa at the 99.7% confidence level.
An intercomparison of standards of mass of 50 g and 10 g was carried out between the national standards laboratories of four European countries during the period May 1988 to July 3 989. The transfer standards used were carefully selected by the pilot laboratory (NPL) and the comparison scheme was chosen to minimise the influence of any instability in their mass. The results obtained show good agreement to within the uncertainties of measurement of the participants, the widest variation in mass value between any two participants being 8 pg at 50 g and 3 c(g at 10 g.
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