Determining the encoding reliability of digital angle transducers

We consider issues of metrological assessment of the accuracy characteristics of digital angle transducers designed to measure the angular movement parameters of various objects. It is shown that currently there is no unified approach to such an assessment, and this is due to the differences in electrical data output interfaces of transducers using parallel or serial code transmission. It is noted that the integral of the transducer encoding reliability can serve as such an assessment. The reliability confidence value characterizes the probability that the value of the measured angle corresponds to the calculated quantum, the code of which has been read. We describe an analytic method for computing encoding reliability for digital angle converters with parallel code transmission. A deficiency in this method is the need to approximate the histogram of the error of the digital angle transducer using distribution functions of random variables. An algebraic method is proposed for calculating encoding reliability that avoids the disadvantage of the analytic method described above. We establish that the algebraic method for calculating encoding reliability can be used for transducers with both parallel and serial code transmission. A methodology is proposed for computing encoding reliability, used to find the integral characteristic of a digital angle transducer with serial and parallel interfaces. It is shown that to find the non-uniformity of the angular scale in a digital angle transducer using a dynamic goniometer with incremental angle encoder requires centering an array of measured error values. The results obtained will be useful in calibrating digital angle transducers.