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A new clamp-type ampmeter employing a magnetoresistive (MR) element has been constructed with a sub-milliampere order sensitivity and a wide frequency bandwidth. The sensor element is a 1000 to 1500 ?? thick, 0.2 mm wide and 15 mm long evaporated thin film of 80/20 NiFe exhibiting a 2.5% magnetoresistive change. The MR element is mounted in the 0.2 mm gap of a ferrite core, which is wound with a 188-turn...
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