BRIDGE MEASURING DEVICE OF PARAMETERS OF BIPOLES Russian patent published in 2015 - IPC G01R17/10 

FIELD: measurement technology.

SUBSTANCE: invention refers to instrumentation, automation and industrial electronics. Particularly, the device enables parameter determination for four-element bipoles or sensors with four-element equivalent circuit. Bridge measuring device of parameters of bipoles includes a serial connection of generator of a complex electric feed signal, a bridge circuit and a null indicator. A bridge circuit consists of two branches. First branch is formed by serial connection of first and second resistors and first inductance coil. A serial connection of third resistor and second inductance coil is connected parallel to the first inductance coil. Fourth resistor is connected parallel to the second inductance coil. Second bridge branch is formed with serial connection of single resistor and two terminals for connection of measurement object bipoles. First bridge branch includes seven additional resistors, and element connection is modified. First and second additional resistors are connected in series with a common output of first and second primary resistors. Second additional resistor is connected to earth. A serial circuit of second resistor, first inductance coil and third additional resistor is connected in parallel to the first additional resistor. Fourth additional resistor is connected in parallel to inductance coil. A serial circuit of third resistor, second inductance coil and fifth additional resistor is connected in parallel to the fourth additional resistor. Fourth resistor and a serial connection of sixth and seventh additional resistors are connected in parallel to the second coil. Bridge circuit output forms a common output of single resistor of the second branch and first terminal of measurement object connection, and a common output of additional sixth and seventh resistors. Both outputs are connected with differential input of zero-indicator.

EFFECT: possible separate balancing of bridge circuit by adjustable resistors alone.

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