Patent ID: 7528592

Claim:
A system for sensing current in one or more first electrical conductors, comprising: a frame; a retainer configured to receive the one or more first electrical conductors and constrain relative movement between the one or more first electrical conductors and the frame; a first magnetoresistive sensor configured to sense magnetic flux and generate an output signal relating to the sensed magnetic flux; an adjustable positioning system configured to enable supporting the first magnetoresistive sensor from the frame in any of a plurality of possible positions with respect to the retainer; and one or more control current conductors configured to carry control current that generates control flux, wherein the control flux is sensed by the first magnetoresistive sensor; and a control circuit configured to receive the output signal of the first magnetoresistive sensor and to cause the output signal of the first magnetoresistive sensor to substantially coincide with a predetermined target at least partially by controlling the control current.