Measurement Of High Resistance by Megohm Bridge method

Procedure

Rm501 Figure

Fig. 1. Circuit digram of experimental set-up for Capacitance measurement by Schering Bridge.

1) Applying voltage E=500V.
2) Set the unknown resistance values Rab, Rag, Rbg from 'Set Unknown Resistor' tab.
3) Then switch on the supply to get millivoltmeter deflection.
4) Varry the values of bridge resistances P, Q, and S from the resistance box until the null deflection is occurred.
5) If "NULL" is achieved, switch to 'Measure Unknown Resistor' tab and click on 'Simulate'. Observe the unknown high resistance value R_ab.