Patent ID: 6965238

Claim:
A method for measuring a resistance of an electrical contact pair in the presence of a low frequency electromagnetic interference wherein the contact pair includes at least one movable contact, the movable contact is movable to break electrical contact with the other contact during an open operation, and the movable contact is movable to make electrical contact with the other contact during a close operation, said method comprising: injecting a high frequency signal across a contact pair in an open state; measuring a voltage across the contact pair; measuring a current flowing through the contact pair; and calculating a resistance of the contact pair using a measured voltage and a measured current sampled at a first time, a measured voltage and a measured current sampled at a second time, and a measured voltage and a measured current sampled at a third time to facilitate minimizing induced current measurement error wherein the first, second, and third times are spaced approximately one half period of the high frequency signal apart.