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Mesurement of Self Inductance by Owen Bridge
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‚ÄčObjective : To determine the self-inductance of an unknown coil.

                          Fig. 1. Owen's Bridge 

This bridge may be used for measurement of an inductance in terms of capacitance. Fig. 1. shows the connections for this bridge, under balance conditions.

Let , L1= unknown self Inductance of resistance R1,

R2= variable non-inductive resistance,

R3= fixed non-inductive resistance,

C2= variable standard capacitor,

C4= fixed standard capacitor.

At balance,

    (R_1+jwL_1)(\frac{1}{jwC_4})=(R_2+\frac{1}{jwC_2})R_3.....(1)

Separating the real and imaginary terms in equ. (1), we obtain ,

L_1=R_2R_3C_4.....(2)

R_1=R_3\frac{C_4}{C_2}.....(3)

 

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