Advantages and Disadvantages of Moving-Iron Power Factor Meter

Advantages and Disadvantages of Moving-Iron Power Factor Meter Points : Advantages & Disadvantages of Moving-Iron Power Factor Meter Advantages Moving-iron p.f. meters are more commonly used as compared to the electrodynamics type because
(i) They are robust and comparatively cheap.
(ii) They have scales tip to 3600
(iii) In their case, all coils being fixed; there are no electrical connections to the moving parts. Disadvantages On the other hand, they are not as accurate as the electrodynamic type of instruments and, moreover, suffer from errors introduced by the hysteresis and eddy-current losses in the iron parts. These losses vary with load & frequency.