Patent ID: 6949927
Filing Date: 2005-09-27
Classification: G01R

Abstract:
1. A measuring device for a magnetic field associated with an electric current comprising: a first MR bridge oriented to be sensitive to the magnetic field to be measured; a second MR bridge oriented to be substantially insensitive to the magnetic field to be measured; a biasing coil configured and positioned to apply a magnetic field to the first and second MR bridges, whereby the sensitivity of the first MR bridge can be controlled; a bus section connectable into the path of the electric current, a signal processing device responsive to a voltage output of the second MR bridge to control the current through the biasing coil, wherein: the bus section is comprised of two parallel legs on opposite sides of a center line, the legs being connected together at respective first ends and connectable at respective second ends into the path of the electric current; and the first MR bridge is comprised of two half-bridge sections positioned symmetrically relative to the center line between the legs of the bus section.