Which of the following method is most widely used for insulation resistance of the cable?
Right Answer is:
Direct deflection method
The direct deflection method is used for high resistance measurement. In such method, a high resistance about 1 kΩ or more) and very sensitive moving coil galvanometer is connected in series with the resistance to be measured along with supply voltage as shown in Fig.
The deflection of the galvanometer gives a measure of the insulation resistance. This method is widely used for measuring the insulation resistance of the cable.