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Should You Be Concerned with Software Measurement Uncertainty

The contribution of software to the uncertainty of measurements is an important but often overlooked aspect of uncertainty evaluations. In coordinate metrology, software is often relied upon for complicated fitting of data, filtering, calibrations, and statistical calculations. Metrology equipment using software can range from hand-held digital calipers to coordinate measurement machines spanning several meters and can occur in almost any industry. We show that historically software has often been responsible for measurement errors. While some of these errors have been reported, others are still surfacing. This paper highlights some of the errors, explores potential problem areas and their causes, and recommends methods to manufacturers and end users to identify and in some cases evaluate and reduce the uncertainty component due to software.