A maxwell inductance capacitance bridge looks like this
The C4 and R4 are in parallel in 4th arm.
Now lets start drawing the phasor diagram
- Draw the currents I1 and I2.
Take I1 as reference. Then for I2, see that I2 consists of capacitor and resistor. As we know that capacitor current is 90 degree lead, the phasor diagram of current is as follows.
2.Now as arm 2 and 3 contains resitance, the voltage and current will be in same direction. So draw E3 and E2 as follows
3.Now in AC bridge, the fundamental rule is that the voltage E1=E2 and E3=E4.So now draw those voltages as follows
So now you have the phasor diagram. IN the AK Sawhney measurement book PG no 590, they have shown some additional things like
But that is simple. As Because C4 and R4 are in parallel. So
So from above 2 and 3 equation, we can get 1.