Method and apparatus for determining wire resistance
AssigneeFluke Corporation
InventorJeffrey Sandsmark Bottman
Life of this patent
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Abstract
A method and apparatus qualifies a conductor for service and determines imbalance resistance of a conductor. The method and apparatus comprises feeding signals from a controller to termination ends of at least three wires of a conductor. In the controller a resistance difference is determined between first and second wires of the conductor using a measured resistance of one of the three conductor wires as a reference value. The conductor is qualified for services when the resistance difference between the first and second wires is below a threshold.
Claims12
A method of qualifying a conductor for services, wherein the conductor has at least three wires, comprising the steps of:
- feeding signals from a controller to termination ends of at least three wires of the conductor;
- determining in the controller:
- a resistance difference between first and second wires of the conductor using a measured resistance of one of the three conductor wires as a reference value;
- resistance values for each of the at least three conductor wires;
- a resistance value of a first wire loop consisting of an aggregate resistance of any two of the at least three conductor wires;
- and
- a resistance value of a second wire loop consisting of an aggregate resistance of one of the wires used in determination of the first loop and a conductor wire not used in determination of the first wire loop;
- and
- qualifying the conductor for services when the resistance difference between the first and second wires is below a threshold.
An apparatus to measure wire resistance in a communication cable having at least first and second wire pairs, comprising:
- a memory;
- a processor disposed in communication with the memory, and configured to issue a plurality of instructions stored in the memory, wherein the instructions issue signals to:
- measure resistance between a first wire of the first wire pair and one reference wire chosen from the second wire pair to produce a first loop resistance measurement value;
- measure resistance between a second wire of the first wire pair and the reference wire to produce a second loop resistance measurement value;
- measure resistance between the first wire and the second wire of the first wire pair to produce a third loop resistance measurement value;
- and
- determine resistance of the first wire by calculating a resistance sum value by adding the third loop value to a difference between the first and second loop values;
- and dividing the resistance sum value in half.
Dependencies are inferred from the claim text.