AC/DC Transfer Features of Dissemination of Voltage Unit Including Long-Term Stability

Abstract

This article discusses the relationship between three characteristics of the quality of a measurement result, namely traceability, uncertainty, and stability. The presented annual stability investigation is based on the assumption of high long-term stability of the planar multi-junction voltage thermal converter, with which the AC/DC transfer standard under study is compared. To evaluate the qualitative aspect of the reproduction of the AC voltage unit for further dissemination, the relationship between the uncertainty of measurements and the difference between two estimates, separated in time by 1 year, was analyzed. To predict the random displacement of the reproducible volt unit, the presence of long-term drift of the hypothetical average AC/DC voltage transfer difference was also analyzed. To guarantee the quality of the performed assessment, three criteria of mathematical statistics were applied in the analysis of the presence of displacement trends.