★ The PMMC has uniformly divided scale.
The scale may be very long , over about 250 degree.
★ The has very high torque to weight ratio.
★ THe PMMC has consumes low power.
★ The PMMC has very high occuracy.
→ Disadvantage of PMMC:-
★ It has comparitively high cost.
★ The PMMC has only suitable for DC measurement.
★ Again of permanent magnet and control spring introduces errors.
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