Method of the drift: More than just an optimization method
Deltamu, Metrology Consulting & training, 63800 Cournon d’Auvergne, France
* Corresponding author: email@example.com
The French guidelines FD X07-014 give different methods of calibration interval which allow to justify intervals of metrological confirmation for the measuring instruments used in a company. It offers three concrete methods. One of them is “Method of the drift”. It is a method based on the equipment drift. The first stage of this method consists in modelling the drift observed for every equipment by the method of least squares. Then, all the instruments of a same family are grouped, in order to determine the maximal drift of the family (statistically). Then, the periodicity of every instrument can be calculated according to its last value of calibration and the maximal drift of its family. This method is used for instruments having a known drift, and essentially for the gauges. So the first aim of this method is to determine the calibration interval. But the purpose of this article is to show that a more detailed analysis can give lots of information and increase the value of the calibration operation. We propose some examples of applications actually implemented in the industry and other that could be easily implemented.
© The Authors, published by EDP Sciences, 2017
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