MEASURING INSTRUMENTS

PREPARED BY EE IIT, Kharagpur

Contributors:  Dr.T.K. Bhattacharya,

                      Prof. N.K. De,

                      Prof.G.D.Ray

                                                                                   

Objectives

• To understand the basic construction of a permanent magnet moving coil (PMMC) instrument and its operation.

• Sketch and explain circuit diagrams for electromechanical dc

ammeters and voltmeters.

• To understand how a single instrument may be used for multi-range ammeters and voltmeters.

• To study the advantage and limitation of PMMC instruments.

• To understand the basic construction of Moving-iron Instrument and its principle operation.

• To study the advantage and errors involved in moving-iron instruments.

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