In the article the research of various test actions to ensure invariance of capacitive moisture meters to change of substance type is carried out. The analysis of ways to reduce uncertainty of substance type is carried out. The most perspective direction of researches – test methods is chosen. The algorithm of a test method and the block diagram of measuring system for additive and multiplicative tests are chosen. During calculations the expression for determination of substance moisture that is invariant to change of dielectric permeability is obtained.
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