Evaluating of the measurement uncertainty in laboratories by presenting an objective example

In order to evaluate the measurement uncertainty, laboratories should identify the uncertainty contribution of various influencing factors on the measurand uncertainty and regularly review the measured uncertainty. In this research, the results of calculating the uncertainty of measuring the mass of a ball sample are presented using the QMSys GUM enterprise software. In order to validate the obtained results from the software, the uncertainty calculation was also done manually and compared with the results of the software. The results show that the obtained uncertainty by the manual method and the software are the same. Also, the results indicate that the contribution of the uncertainty of repeatability on the uncertainty of the measurand is greater than the other factors; therefore, the optimization of the obtained uncertainty is possible by increasing the number of repetitions of the test or training the examiner to provide more accurate results.