Theoretical bases of designing of quasiinvariant measurement transducers and systems based on the two-channel principle

The article presents the theoretical bases designing of quasi-invariant measurement transducers based on the principle of two-channel, which was proposed by Academician B.N. Petrov. The method considered in this work was called technological. It is used in cases where the conditions of absolute invariance of measurement transducers and systems cannot be realized. In parallel with the method, a technique is provided for identifying quasi-invariance conditions, essentially representing a «know how» in each specific case. The method and technique are illustrated by examples in the class of two-channel bridges and half-bridge measurement transducers.