Comparison between moving-iron (M.I) instruments and moving-coil( M.C)instruments
Category: Electrical Articles
23 Jan 18
| M.I Instruments | M.C Instruments |
|---|---|
| It can be used for a.c as well as d.c voltage and current measurement. | It is suitable only for the d.c voltage and current measurement. |
| Less sensitive as compared to MC instruments. | It is much sensitive than M.I instruments. |
| Torque to weight ratio is less as compared to M.C type. | Torque to weight ratio is high as compared to M.I type. |
| It is cheaper then MC and dynamometer. | It is costlier then M.I and dynamometer type due to high cost of permanent magnets. |
| Air friction damping is used. | Damping is perfect as eddy current damping is used. |
| Error are set due to hysteresis and stray fields. | Error are set due to aging of control springs,permanent magnet. |
