METHODS AND DEVICES FOR AC CURRENT SOURCES, PRECISION CURRENT TRANSDUCERS AND DETECTORS

摘要

Precision AC voltage, current, phase, power and energy measurements and calibrations with current ranges from 1 uA to 20 kA and voltage ranges from 1V to 1000 kV are now performed with accuracies of better than one part per million. Continued demand for improved accuracy has led the inventors to address improvements to dual stage and multi-stage current transducers that may form the basis of the measuring process within many of the measurement instruments providing the precision AC measurements and calibrations. Additionally, the improvements to dual stage and multi-stage current transducers provide for novel feedback controlled precision AC current sources without requiring measurement of the AC current source output directly.

主权项

1. A device comprising:
a dual stage current transducer comprising at least a primary winding, a first secondary winding and a second secondary winding; a first four terminal shunt coupled across the first secondary winding; and a second four terminal shunt coupled across the second secondary winding; wherein a first voltage generated across the second four terminal shunt is subtracted from a second voltage generated across the first four terminal shunt.