Permanent Magnet Moving Coil PMMC instrument One of the most accurate type of instrument used for DC measurements is PMMC instrument Construction A permanent magnet is used in this type instrument Aluminum former is provided in the cylindrical in between two poles of the permanent magnet Fig 27 Coils are wound on the aluminum
4 PMMC instruments are costlier 5 Aging of the instrument permanent magnet and control spring may introduce some errors Application of PMMC Instruments Permanentmagnet movingcoil instruments can be used as ammeters with the help of a low resistance shunt or as voltmeters with the help of a high series resistance
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PMMC Department of Electrical Engineering Applications PMMC instruments can be used as dc ammeter and its range can be increased by using a large number of turns in parallel with the instrument The range of this instrument when used as a dc voltmeter can be increased by using a high resistance in series with it
Permanent Magnet Moving Coil PMMC instrument PMMC is one of the most accurate types of instrument used for DC measurements of current and voltage Principal operation It works on the principal of when DC supply is given to the moving coil DC current flows through it When the current carrying coil is kept in the magnetic
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13 Permanent Magnet Moving Coil instrument PMMC The PMMC instrument is the most accurate type for DC measurement 131 Principle When a current carrying conductor is placed in a magnetic field a mechanical force is experienced on the conductor which tends to move the conductor in a direction given by Flemings left hand rule 1 2 3 R sh
Learn about the principle construction advantages and disadvantages of PMMC instruments for direct current measurements Download the PDF file from the web page for more details and diagrams
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OF A PMMC INSTRUMENT The permanent magnet moving coil instrument is the most accurate type for dc measurements The working principle of these instruments is the same as that of the galvanometers the difference being that a direct reading instrument is provided with a pointer and a scale Construction of PMMC Instruments
Permanent Magnet Moving Coil Mechanism PMMC In PMMC meter or DArsonval meter or galvanometer all are the same instrument a coil of fine wire is suspended in a magnetic field produced by permanent magnet According to the fundamental law of electromagnetic force the coil will rotate in the magnetic field when it
One of the most accurate type of instrument used for DC measurements is PMMC instrument ConstructionA permanent magnet is used in this type instrument Aluminum former is provided in the cylindrical in between two poles of the permanent magnet Fig 17 Coils are wound on the
17 Permanent Magnet Moving Coil PMMC instrument One of the most accurate type of instrument used for DC measurements is PMMC instrument Construction A permanent magnet is used in this type instrument Aluminum former is provided in the cylindrical in between two poles of the permanent magnet Fig 17
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PDF Permanent Magnet Moving Coil PMMC instrument