De Sauty Bridge
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De Sauty’s Bridge
This is a simple method for comparing two capacitances. C1 and C2 are the two capacitances to be compared. R1 and R2 are variable, non-inductive resistances. Audio frequency oscillator is connected between A and C, and headphone between B and D.When the bridge is balanced,
Z1/Z2 = Z3/Z4 or Z1/Z3 = Z2/Z4
Here, Z1 = R1; Z2 = 1/jωC, Z3 = = R2, Z4 = 1/jωC2
. : R1/R2 = 1/jωC1 / 1/jωC or C2/C1 = R1/R2
. : C2 = C1R1/R2 … (1)
If C1 is known, C2 can be calculated.
Eq. (1) is the only equations to be satisfied at balance. Hence R1 and R, are suitably varied until the sound in the headphone is inaudible.
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