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Compare PMMC & MI instrument.

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1 Answer

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Points
PMMC instruments
MI instruments
Principle
When current carrying conductor is placed in a magnetic field, it experiences mechanical force
Piece of iron is attracted /repelled by magnet or magnetic field.
Scale
Uniform
Non-uniform
Torque/Weight ratio
Higher
Lower
Application
PMMC instruments are used only for DC measurements
Used for DC as well as AC measurements 
Cost
Higher cost for same range
Lower cost for same range
Damping
Eddy current 
Air friction
Sensitivity
More sensitive
Comparatively less sensitive

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