Patent ID: 7659732

Claim:
A system for measuring the resistance between first and second terminals of a resistive device, the system comprising: a four-wire ohmmeter, comprising: a housing; a display mounted in the housing and being visible externally from the housing; electrical circuitry mounted within the housing and connected to the display, the electrical circuitry including a current source, a current sink, and a voltage measuring device having a positive terminal and a negative terminal; and first and second apertures formed in the housing, each of the terminal apertures having a pair of semi-cylindrical conductive sleeves aligned with the respective aperture and electrically isolated from each other, the sleeves being connected to the electrical circuitry; a positive probe and a negative probe; first and second conductive wires connected to the positive probe; third and fourth conductive wires connected to the negative probe; and a four-wire connector, comprising: a first and second, electrically insulative elongated members separated from each other by a predetermined distance by an interconnecting web; a pair of elongated electrical contacts mounted on opposite surfaces of each of the elongated members, the contacts mounted on each of the elongated members being spaced apart from each other, the contacts mounted on one of the elongated members being connected to the first and second wires, respectively, and the contacts mounted on the other of the elongated members being connected to the third and fourth wires, respectively, the contacts that are connected to the first and second conductive wires being sized and shaped to fit into the sleeves that are aligned with the first aperture of the ohmmeter and to make contact with respective ones of the sleeves that are aligned with the first aperture, the contacts that are connected to the third and fourth conductive wires being sized and shaped to fit into the sleeves that are aligned with the second aperture of the ohmmeter and to make contact with respective ones of the sleeves that are aligned with the second aperture.