Patent ID: 6737875
Filing Date: 2004-05-18
Classification: G01R

Abstract:
A device configured to measure an impedance between first and second nodes of an electrical circuit, the device comprising:a) at least one current source configured to provide first and second currents of known values; b) first and second probes, connected to the at least one current source, and configured to contact the respective first and second nodes to apply the first and second currents to the first and second nodes; c) a third common probe, connected to the at least one current source, configured to contact the circuit at a common node at a location that has an equal current flow with respect to the first and second nodes; d) at least one voltage meter, configured to be connected to the first and second nodes, to measure voltages corresponding to the first and second currents; and e) a processor, operatively coupled to the at least one current source and the at least one voltage meter, capable of calculating the unknown impedance based on the known values of the first and second current and the measured values of the voltages.