Measurement uncertainty evaluation at gauge block calibration

The example 9.5 from JCGM-SI “Gauge block calibration” with a nominal length of 50 mm by the comparison method using a comparator and a reference measure of the same nominal length and the same material as the original standard is analyzed. In JCGM-SI compares the procedures for uncertainty evaluation, performed on the basis of the law of propagation of uncertainty (GUM) and the Monte Carlo method. The report uses the procedure developed by the authors, which consists Taylor-series expansion of the measurement model into a second-order series taking into account the kurtosis of input quantity distributions. To facilitate engineering calculations, the finite increment method is used. The excess method is used to find the expanded uncertainty. The good agreement of the results obtained by the proposed method with the results obtained by the Monte Carlo method is shown.