List of torques in analog instruments:
1. Deflecting torque
2. Controlling / restraining torque.
3. Damping torque.
1. Deflecting torque:
- To create deflection of pointer proportional to the quantity to be measured; this is normally electric current.
2. Controlling / restraining torque:
- To restrict the motion of pointer/spindle and stop the pointer at the relevant position to get correct reading.
- To bring back pointer to zero position when the quantity under measurement is removed.
3. Damping torque:
- To stop pointer/spindle at the final deflected position.
- Bring the pointer to standstill quickly.
- To minimize oscillations about final position.