Errors in PMMC permanent magnet moving coil

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 Errors in PMMC permanent magnet moving coil

Frictional error

Let suppose provide input current to the permanent magnet moving coil PMMC due which deflection is produce the pointer need to rotate. Now due to fraction the pointer will not move. The scale which is used for measuring the frictional error is torque to weight ratio. When the torque to weight ratio of instrument is high then it means it has low frictional error and when the torque to weight ratio of the instrument is low then it means that it has high frictional error. To increase the torque to weight ratio we will decrease the weight. So to decrease the weight of the pointer it is made from the aluminium.


Temperature error

Due to temperature the internal resistance of the PMMC will change due to which it will produce error. To reduce temperature error we will use swamping resistance which is actually manganin wire whose temperature coefficient is very low.


Frequency error:

There will be no frequency error as we are measuring dc voltages.

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