Question

What are the basic requirements of indicating instruments? Briefly discuss them.

Answer 1

The basic requirements of indicating instruments are given below.

Explanation:

The indicating instruments are those instruments whose function is to give the instantaneous value of the electrical quantities. Quantities like potential difference, current etc.

These instruments are of special type. One of the example is MI instrument which is a type of attraction instrument.

Basic requirements of  indicating instruments are:

• Coil
• Balance weight
• Scale
• Control Weight
• Pointer
• Piston

etc.

Answer 2

Basic requirements of indicating instruments are: Balance weight, Control Weight, Pointer,  Piston, Scale.

Explanation:

• In essence, an indicating instrument is a moving system that pivots on jewel bearings. On a graduated scale, a pointer is attached to the moving system, indicating the electrical quantity to be measured.
• The following three torques are required to ensure the appropriate operation of the indicating instruments.
• Torque deflection (or operation). Torque control (or restoration). Torque dampening The deflecting torque is generated by leveraging the different effects (magnetic effect, induction effect, thermal effect, and hall effect) of electric current or voltage, which causes the moving system, and therefore the pointer, to move away from zero. The controlling torque resists the deflecting force and is generated by a spring or gravity.
• The pointer comes to a stop at a place where the opposing torques are balanced. Air friction or eddy currents generate damping torque.