BRIDGE METER OF BIPOLES PARAMETERS Russian patent published in 2013 - IPC G01R17/00 

FIELD: electrical engineering.

SUBSTANCE: bridge meter of bipoles parameters contains the following parts, connected in series: a generator of feeding pulses, a four-leg bridge circuit and a null indicator. The generator contains drivers of linear-, quadratic- and cubic-shaped pulses as well as pulses variable according to the biquadratic law, a power amplifier, a switcher and a synchronisation unit. The bridge circuit is formed by two branches, placed in parallel. The first branch consists of serially connected resistors while the second one contains serially connected resistances, a circuit with adjustable balancing elements as well as the measurement object bipole. The common output of the first branch resistances forms the first peak of the measurement diagonal and is connected to the null indicator differential input. The second peak of the measurement diagonal is formed y the common output of the second branch serially connected resistances and is also connected to the null indicator differential input, the indicator synchronisation output connected of the generator second output. The common output of the generator and the null indicator as well as the outputs of the circuit balancing elements, of the first branch second resistance and of the second terminal for the measurement object connection are grounded.

EFFECT: decreased measurement error due to exclusion of the error component of the ungrounded multi-element bipole parasitic capacity relative to the ground.

1 dwg