Metrology Model of Measuring Channel in Multi-Channel Data-Measurement System

Developing metrology solutions is of major importance when building data-measurement systems. One of the key issues is evaluating the characteristics of measuring channels built on the basis of digital sensors of physical values. These sensors include a primary analog transducer and an analog-digital converter. The study evaluates the occurrence of errors in measuring channels of a multi-channel data-measurement system. This study deals with the measuring channel built on the basis of digital temperature sensor employing contact measurement. The digital temperature sensor is an integral body that combines both the primary temperature transducer and the primary data processing units. Drawing on the analysis of various errors the study develops the abstract metrology model of the measuring channel. This model takes into account the errors related to inherent instrument errors as well as the errors induced by the structure of the measuring subsystem. The work presents calculations of multiplicative and additive errors of the measuring channel. It also suggests measures for minimizing the additive errors of the measuring channel in the system.