A Four Terminal Axial-Bishielded Networks

Abstract

An impedance measurement object with an H-shaped four-terminal equivalent substitution circuit is considered. An error analysis was performed for sensors whose non-informative supply resistances are of the same order or exceed the measured impedance. A new definition of four-terminal impedance has been proposed, namely four-terminal axial be-shielded (FTABS) measuring object. Based on such new definition, the scheme of axial-bishielded bridges is proposed for precision measurement of temperature and electrolytic conductivity of liquids. Such bridges differ from the well-known coaxial bridges since the former ones have an additional circuit for equipotential protection, which is located between the flow circuits of direct and reverse currents. References 18, figures 7.