Question

6 ) Why the pointer is not stable at zero on the scale
as the megger is not in use?​

Answer 1

Explanation:

bro it is in

value of resistance

1. the pointer shows the point as infinity

if it is low

so it indicates zero

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Answer 2

It happens that the megger is not in use and the pointer is not stable at zero on its scale, only when the megger is faulty and is not working properly.

• A megger is an instrument to measure the resistance of insulation of electrical items like cables.
• The working principle of a megger is based on the moving coil of the electrical instrument.
• The current-carrying conductor which is placed in a magnetic field experiences a torque known as deflecting torque.
• The deflecting torque is proportional to the current flowing in the circuit and causes the pointer of the megger to move from its zero position overcoming the inertia of rest.
• To control the deflecting torque in the pointer of the megger the coil attached to the pointer provides controlling and damping torque.
• Thus the equilibrium between the deflecting torque and the controlling torque gives the actual reading of the resistance which the megger measures.
• Therefore, the faulty megger where the coil losses its shape or strength as a spring and is unable to provide the damping torque may have the pointer unstable at zero on its scale.

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