Electrical Engineering ⇒ Topic : Advantages and Disadvantages of Dynamometer Type

Advantages

• These types of instruments can be used for both DC as well as ac currents.
• Since iron is absent in the working parts of the instruments, these instruments are free
• from hysteresis and eddy current errors.
• Ammeters up to 10 A and voltmeters up to 600 V can be constructed.

Disadvantages

• Scale is not uniform.
• Torque-weight ratio is small. Friction errors tend to be serious.
• These instruments are most expensive than the other types of instruments