PMMC Instrument

PMMC Instruments – Construction and Working Principle

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Permanent Magnet Moving Coil or PMMC Instruments are the most accurate type for the measurement of DC current or voltage. The working principle of PMMC instruments are same as that of d’Arsonaval type of Galvanometer, difference being that a direct reading instrument is provided with pointer and scale. Construction of PMMC Instruments Permanent Magnet Moving … Read more PMMC Instruments – Construction and Working Principle

Sensitivity of PMMC Voltmeter

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The current sensitivity of voltmeter of moving coil type like PMMC voltmeter is defined as the deflection per unit current in the coil. If Ɵ be the angular deflecting of needle of voltmeter for current I through the moving coil, then sensitivity of voltmeter is given as S = Ɵ / I You might think … Read more Sensitivity of PMMC Voltmeter