In PMMC meters, what component often provides the damping function?

In PMMC meters, what component often provides the damping function?

Right Answer is:

The aluminum frame on which the coil is wound

SOLUTION

  • In PMMC (Permanent Magnet Moving Coil) instruments, the aluminum frame on which the coil is wound often provides the damping function.
  • As the coil moves in the magnetic field, eddy currents are set up in the aluminum frame or core, which opposes the motion of the coil.
  • This results in the pointer slowing its swing and coming to rest quickly with minimal oscillation.
  • The damping torque ensures the pointer reaches an equilibrium position on the scale, providing an accurate reading. Eddy current damping is commonly used in PMMC instruments

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