Where, C2
= capacitor whose capacitance is to be measured
C3
= a standard capacitor
R1,R4 = variable
non-inductive resistances
At balance obtained by varying either R1 or R4 , current through D is zero
De Sauty bridge is used to compare the two values of
capacitors as long as dielectric losses are negligible.
De Sauty bridge Phasor diagram
De Sauty bridge Advantages and disadvantages :-
The simplicity of the bridge (advantage) is offset by the
disadvantage that its almost impossible
to obtain balance if capacitors are not free from dielectric losses.
