Ratiometer pointer movement is achieved by
- one coil providing a torque against a permanent magnet
- two opposing coils providing a torque in a varying magnetic field
- two opposing coils providing a torque in a permanent magnetic field
Explanation
A ratiometer indicates by balancing the currents in two opposing coils that move within the field of a permanent magnet. Pointer position depends on the ratio of the two coil currents, so the reading is independent of supply voltage variations. A single coil against a magnet describes a moving-coil meter, not a ratiometer.
wongyk asking:
Do this means ratiometer in permanent magnetic field as in DC?
If AC ratiometer will be in a varying magnetic field?
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