What is the purpose of the jewel bearings in a PMMC meter?

What is the purpose of the jewel bearings in a PMMC meter?

Right Answer is:

To decrease friction

SOLUTION

The purpose of the jewel bearings in a PMMC meter is to decrease friction.

  • Low-Friction Support: Jewel bearings, typically made of synthetic sapphire or ruby, provide a low-friction surface for the pivot to rest on. This ensures smooth and accurate movement of the pointer.
  • Pivoted Coil: The coil is pivoted on jeweled bearings, allowing it to rotate freely.

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