Electrical Measurement

Deflecting Force (Torque)

It deflects the pointer to a deflecting angle proportional to the input quantity to be measured

Deflection instruments are classified, according to the source of generation of this force, into

two main types:

Permanent Magnet Moving Coil instrument (PMMC)

Electro-dynamic instrument

The deflection instruments have a pointer, which deflects over its scale to indicate the quantity to be measured (current, voltage, …etc).

Three forces (torques) are required for proper operation of these instruments:

Deflecting Force (Torque)

Control Force (Torque)

Damping Force (Torque)