Advantages and Disadvantages of Moving Coil Instruments


Advantages and Disadvantages of Moving Coil Instruments

Advantages:

1.       Uniform scale.
2.       High sensitivity
3.       Low power consumption.
4.       No hysteresis loss.
5.       Not much affected by stray magnetic fields.
6.       Very effective and efficient eddy current damping.
7.       High torque / weight ratio.
8.       Very accurate and reliable.
9.       Can be used in vertical and horizontal position due to spring control and

10.    Can be designed to cover a wide range of currents and voltages by using shunt and series resistances respectively

Disadvantages:

1.       Can be used only for D.C measurements.
2.       More costly than moving iron instruments.
3.       Develop errors due to ageing of control springs and permanent magnets, and

4.       Develop also errors due to friction, mechanical unbalance, resistance temperature coefficient, etc.

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