These instruments are used for high voltage AC and DC measurements. It works on the electrostatic principle where the repulsion between two charges plates deflect at a pointer attached to a spring. The ranges are extended by keeping the resistors in series with the coil. The interaction of fluxes produced by these elements produces deflecting torque. It consists of soft iron containing movable and fixed coils. Moving Iron Instruments are used in AC circuits and are categorized into Simple Moving Iron, Dynamo Meter type and Induction types of instruments. The interaction of the two fields produces a deflecting torque. One coil is fixed and the other coil rotates around it. Dynamo Meter Type Moving Coil Instrumentsĭynamo meter type Moving Coil Instruments consist of two coils. When the current flows through the coil, deflecting torque is generated according to Lorenz force equation.įig. The coil is wounded on a soft iron piece and it rotates in its own vertical axis. These instruments have permanent magnet to produce magnetic field. Permanent magnet type Moving Coil Instruments respond only to direct current. Permanent Magnet Type Moving Coil Instruments
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