M J T Milton et al 2006 Metrologia 43 L7 doi:10.1088/0026-1394/43/3/N01
M J T Milton1, F Guenther2, W R Miller2 and A S Brown1
Show affiliationsThe uncertainty of primary standard gas mixtures is limited by the uncertainty of their gravimetric preparation. Although this fact is widely accepted, it has never been demonstrated directly because the uncertainty involved in the analysis of gas mixtures is much larger than that from the gravimetric preparation alone. We report the first-ever analysis by a single comparison process of a set of independently prepared gravimetric gas mixtures. The analysis of the data has used a method that calculates the parameters of a regression relationship that minimizes the random contributions from both the model and the gravimetric component. The standards studied here are comparable with a standard deviation of the residuals of seven measurements (after the exclusion of two outliers) of 0.002% (relative to value), or an expanded uncertainty of 0.004% relative. This is a factor of between 2 and 30 less than the estimated uncertainties for the gravimetric preparation of each individual standard and serves to confirm the state of the art in this field.
02.50.-r Probability theory, stochastic processes, and statistics
Issue 3 (June 2006)
Received 14 September 2005
Published 21 February 2006
M J T Milton et al 2006 Metrologia 43 L7
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