The problem of modeling the process of functioning of redundant measuring instruments is considered. The determination of the frequency of verifi cation of complex duplicate measuring instruments is validated on the basis of a semi-Markov model of the process of functioning of the instruments. The importance of the use of the theory of semi-Markov processes for modeling the functioning of redundant technical systems, including measurement systems, is demonstrated. A semi-Markov model of the process of functioning of measuring instruments by means of which the infl uence of such factors as the frequency of verifi cation, support of measuring instruments with spare parts, level of failure-free performance, and degree of maintainability on the reliability of measuring instruments may be taken into account is developed. A method of specifying a semi-Markov process that correctly and adequately approximates the true process is found. The availability factor of the measuring instruments is selected as the indicator of the operating effi ciency of the functioning of a measuring instruments and of the corresponding model.

The problem of modeling the process of functioning of redundant measuring instruments is considered. On the basis of the developed model, the determination of the frequency of verification of complex duplicated measuring instruments based on the semi-Markov model of the process of their functioning is justified. The relevance of the application of the theory of semi-Markov processes for modeling the functioning of redundant technical systems, including measuring instruments, is shown. A semi-Markov model of the process of functioning of measuring instruments has been developed, which allows us to take into account the influence of the frequency of verification, the provision of measuring instruments with spare elements, as well as the level of reliability and maintainability on the reliability of measuring instruments. A method is found for defining a semi-Markov process that correctly and adequately approximates the real process. The indicator of the effectiveness of the functioning of the measuring instruments and the corresponding model is the availability factor of the measuring instruments.