BRIDGE MEASURING DEVICE FOR MEASURING PARAMETERS OF TWO-TERMINAL CIRCUITS Russian patent published in 2018 - IPC G01R17/10 

FIELD: monitoring and measurement equipment.

SUBSTANCE: invention relates to instrumentation, automation and industrial electronics and can be used to monitor and determine the parameters of measurement objects, as well as physical quantities through parametric sensors. Bridge measuring device for measuring parameters of the two-terminal circuits comprises a series-connected pulse generator with voltage variation according to the law of step functions, the bridge electrical circuit and the zero indicator. To achieve the technical result, an additional resistor is introduced and the connection of the elements is changed. Additional resistor is connected to the first terminal for connection of the two-terminal circuits and measuring objects, which is connected to the common terminal of a single resistor in the second branch of the bridge circuit and the two-terminal circuit of the first, second resistors and inductive coil. Second terminal for connecting the two-terminal circuits of the measuring objects is grounded. Two-terminal circuit of a parallel-connected capacitor and a resistor is connected between the free terminal of the additional resistor and the second terminal for connecting the two-terminal circuit of the measurement objects. Combination of the additional resistor, the capacitor and the resistor of the two-element circuit form a two-terminal circuit of the measurement object.

EFFECT: reduction of the measurement error due to the elimination of the error component from the parasitic capacitance relative to the "earth" of the ungrounded multi-element two-terminal circuit, as well as the instability of this parasitic capacitance through the use of only grounded multi-element two-terminal circuits.

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