Advantages and Disadvantages of Dynamometer Type Instruments

Advantages:

1. These instruments are free from hysteresis losses and eddy current losses.

2. They have a precision grade accuracy.

3. These instruments can be used on both A.C and D.C. They are also used as a transfer instruments.

4. Electrodynamometer voltmeters are very useful where accurate RMS values of voltage, irrespective of waveforms, are required.

Disadvantages:

1. They have a non-uniform scale.

2. These instruments have a low sensitivity due to a low torque to weight ratio.

3. They are more expensive than either the PMMC or the M.I type instruments.

4. These instruments are sensitive to overloads and mechanical impacts. Therefore, they must be handled with great care.

5. The operating current of these instruments is large due to the fact that they have a weak magnetic field.

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