DEVICE FOR MEASURING PARAMETERS OF MULTIELEMENT PASSIVE TWO-TERMINAL NETWORKS Russian patent published in 2012 - IPC G01R17/00 

FIELD: physics.

SUBSTANCE: device consists of the measured two-terminal network which is connected into the input circuit of a measuring transducer which is based on an operational amplifier, in whose feedback circuit a reference resistor is connected. Voltage pulses act on the two-terminal network, said voltage pulses varying according to a time to the power n law and the shaper of which has n inverting integrators; between the output of the last, n-th integrator and the input of the first integrator there is an n-stage differentiator on RC circuits and a differential amplifier for the negative feedback signal; current flowing through the two-terminal network is balanced by a compensating signal which is synthesised from current pulses having the shape of time power functions with the exponent from n to 0; current amplitude is controlled using resistors connected between outputs of corresponding integrators and the input of the measuring transducer, while bringing to zero, at the end of the transient process, voltage across all outputs of the second n-stage differentiator, and general conductivity parameters are then determined, and their values are then used to calculate electrical parameters of elements of the two-terminal network.

EFFECT: high stability of characteristics of the measuring device and measurement accuracy, wider range of measured parameters of R-C, R-L and R-L-C two-terminal networks.

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