All measurements, no matter how carefully and scientifically they are carried out, are subject to certain uncertainties. These uncertainties are investigated and evaluated in the context of error analysis. The two most important functions are:The final measured value must therefore always be provided with an error indication in order to be able to recognise its accuracy. A distinction is made here betweenSystematic errors or systematic deviations are, as the name suggests, errors of the measuring system itself: They are reproducible and affect every single measured value in the same way.