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in low-frequency measurement technology, a component of moving-coil measuring systems that is used in light-beam oscillographs and moving-coil galvanometers. A moving coil is a light coil of wire that is located between the poles of a permanent magnet. In a galvanometer, the moving coil is suspended from very thin metallic ribbons; in an oscillograph, it consists of a very thin wire to which a small mirror is attached.
When a current flows through a moving coil, the coil is deflected in the magnetic field. In moving-coil galvanometers, the magnitude of the deflection is read by means of a microscope. In light-beam oscillographs, it is read on the basis of the deflection of a light beam reflected from the mirror.
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R. I. PERETS