Method of calibration intervals justification of measuring instruments

The paper analyzes the problem of choosing verification interval of measuring instruments which depends on the level of metrological reliability of measuring instruments, and on the financial costs of measuring instruments verification, and possible damage due to inaccurate measurement results. The urgency of solving the problem of improving scientific and methodological apparatus which allows us to determine the optimal duration of calibration interval of measuring instruments at setting values of specified metrological characteristics is justified. The existing methods based on the use of formal description of the dependences of the accuracy and metrological reliability of measuring instruments on the average operation time since the last calibration are investigated. Deficiencies that do not allow us to solve the problem fully are identified. Scientific-methodical device that allows us to determine the optimal duration of the calibration interval of measuring instruments to the specified values of metrological characteristics is proposed. The model based on formalization of economic costs which are necessary for the operation of measuring instruments is presented. When optimizing the objective function is selected as a function of economic costs which depends on the cost of calibration testing and damage due to inaccurate measurements. In addition, the objective function takes into account the random nature and heterogeneity of metrological characteristics of measuring instruments. As a result, the task of justification of calibration interval is reduced to finding the minimum of the objective function. Finally, a numerical example of calculating the calibration interval of a measuring instrument based on the proposed model is presented.

calibration interval, measuring instrument, metrological support, periodic verification, function of economic expenses, metrological reliability

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