Noise reduction using a matching input transformer (magnetic field measurement system)

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Abstract
Describes the noise characteristics of a magnetic field measurement system which consists of an induction coil detector, a matching input transformer and a sensitive preamplifier. The best noise performance is obtained when the amplifier operates with optimum source resistance. The optimal conditions are obtained by using a transformer to match the source and amplifier resistances. The limited frequency response of the transformer, however, often restricts its application. The methods of designing a broad-band instrumentation transformer are discussed. As an example the transformer construction for a magnetocardiographic measurement system and some measurement results are also presented.

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