Analysis of the influence of the estimate of standard measurement uncertainty as a result of a correction due to the finite resolution of the readings on the decision on the measuring equipment conformity during calibration

The paper considers the features of the evaluation of the component of standard measurement uncertainty of type B as a result of a correction due to the finite resolution of the readings of measuring equipment during calibration. The problem of carrying out the procedure for establishing the compliance of the measuring equipment with the technical specification based on the results of its calibration is stated. It is emphasized that the procedure shall necessarily account for the measurement uncertainty. In this regard, the metrological characteristics of the measuring equipment after calibration may not meet the requirements of the technical specification. The calibration and measurement capabilities of accredited laboratories when calibrating a smooth micrometer MK25 for compliance with the technical specification according to the results of its calibrations are analysed. It is shown that the component of standard measurement uncertainty of type B as a result of a correction due to the resolution of the readings of analogue measuring instruments cannot be dominant in the uncertainty budget. It is proposed to consider the establishment of a target uncertainty during calibration for the analysis of the calibration and measurement capabilities of measuring equipment in the laboratory. At the same time, the reliability of the evaluation of measurement uncertainty during the calibration of measuring equipment depends on the correct choice of appropriate procedures. Therefore, at the legislative level, namely in the Law of Ukraine “On Metrology and Metrological Activities”, it is established that the measurement equipment results are calibrated and registered in accordance with national standards harmonized with relevant international and European standards, and documents approved by international and regional metrology organizations.