Device error
Human error
Influence error
Switching error
Moving coil instrument
Moving iron instrument
Induction type instrument
Dynamo meter type instrument
Three phase two element
Three phase three element
Single phase single element
Three phase two element with CT & PT
Volt / ohm
Ohm / volt
Ohm metre
Ohm / metre
To reduce the disc weight
For power factor correction
To prevent the flux leakage
To arrest the creeping error