Question

Which among the following is not a method for measurement of High Resistance ?
1. Direct deflection method
2. Megger
3. Loss of charge method
4. None of the above

Answer 1

Correct Answer - Option 4 : None of the above

High resistance:

• Generally, if the resistance is more than 100 kΩ, it is called high resistance.
• Cable insulation resistance, machine winding insulation resistance, reverse-biased semiconductors are some examples of high resistance.
• Usually, to measure high resistance three terminals are required.
• The third terminal is the guard terminal which is used to eliminate leakage currents.

Methods used for measuring high resistance are 

1. Loss of charge method
2. Megger method
3. Mega ohm bridge method
4. Direct deflection method

• Among all the above methods loss of charge method is an accurate method to measure high resistance.
• Loss of charge is used to find cable insulation in research laboratories.
• Megger is also can be used for the measurement of insulation resistance of the cable.
• In megger, spring control is not required because it does not need any controlling torque.