Creating and sharing knowledge for telecommunications

Uncertainty evaluation of multivariate quantities: A case study on electrical impedance

Ramos, P.M. ; Janeiro, F. M. ; Girão, P.M.

Measurement: Journal of the International Measurement Confederation Vol. 78, Nº 1, pp. 397 - 411, January, 2016.

ISSN (print): 0263-2241
ISSN (online): 0263-2241

Journal Impact Factor: 0,662 (in 2008)

Digital Object Identifier: 10.1016/j.measurement.2015.08.043

Abstract
The paper discusses the evaluation of the uncertainty of a multivariate quantity using the Law of Propagation of Uncertainty defined in the Guide to the Expression of Uncertainty in Measurement (GUM) and a Monte Carlo method according to the GUM’s Supplement 2. The quantity analysed is the electrical impedance, which is not a scalar but a complex quantity. The used measuring method allows the evaluation of the impedance and of its uncertainty in different ways and the corresponding results are presented, compared and discussed. For comparison purposes, results of the impedance uncertainty obtained using the NIST Uncertainty Machine are also presented.