Abstract
The ISO “Guide to the Expression of Uncertainty in Measurement” (GUM) establishes a unified method for evaluating and stating measurement uncertainties that has been accepted by nearly all calibration services and most test co-operations in all parts of the world. In measurements of mechanical quantities, such as acceleration and derived motion quantities, the application of the GUM may be difficult and very time-consuming unless some possibilities of simplification are made use of. After a brief introduction to the basic procedure specified in the GUM for the calculation of the measurement uncertainty, a survey of the problems typically encountered in uncertainty calculations when, for example, vibrations are measured or accelerometers calibrated by laser interferometry is given. It is shown how a model function of simple structure can be established for the usually complex relationship between the output quantity (e.g. sensitivity of an accelerometer), the quantity to be measured (e.g. acceleration) and various influence quantities (noise, transverse motion, base strain, etc.). Among other things, non-linear effects such as the influences of distortion, hum and noise can be properly taken into account.
Published Version
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