BRIDGE MEASURING DEVICE OF PARAMETERS OF BIPOLES Russian patent published in 2014 - IPC G01R17/10 

FIELD: measurement equipment.

SUBSTANCE: invention relates to instrumentation, automation and industrial electronics, and namely it allows determining parameters of four-element bipoles or parameters of sensors with a four-element equivalent circuit. A bridge measuring device of parameters of bipoles includes an in-series connected pulse generator of feed pulses with variation of voltage during their duration as per a law of power functions, a four-arm bridge circuit and a zero indicator. A new feature of the bridge measuring device of parameters of bipoles is that connection of the second capacitor and the second resistor of the bipole with balancing elements has been changed; an additional capacitor has been introduced to it and connection of a bridge circuit has been changed; a free output of the second capacitor is connected to the second output of a measuring diagonal of the bridge; a free output of the second resistor is connected to the first top of the generator diagonal of the bridge; the introduced additional capacitor is connected in parallel to the available first resistor; an output of the first top of the generator diagonal of the bridge is connected to an earthed output of the pulse generator output; the output of the second top of the generator diagonal of the bridge is connected to a signal output of the first output of the pulse generator; in the second bridge branch, a common output of the first resistor, the second and the additional capacitors and a single resistor of the second arm of the bridge ratio forms the second output of the measurement diagonal of the bridge, which is connected to the second output of the first (differential) input of a zero indicator.

EFFECT: result consists in reduction of measurement error owing to excluding error components from parasitic capacitances relative to earth of adjustable balancing elements and non-stability of those parasitic capacitances.

1 dwg