Pointer Scale
Deflecting system convert electrical signal to mechanical force
* No input signal, pointer at zero position
-
Magnitude effect
Current pass through coil, produce a bar magnet
Soft iron near the coil, it is magnetized
- Force of attraction between the coil and soft iron piece
Moving iron attraction type instrument
- Electrodynamometer type instrument
- - Force of repulsion between 2 current carrying coil
- Spring control
- - Angle and I are directly proportional
- PMMC Permanent Magnet Moving Coil for DC Measurement