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:
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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