Measurement of Self Inductance by Owen’s Bridge

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Measurement of Self Inductance by Owen’s Bridge :

Owen’s bridge may be used for the measurement of inductance in terms of capacitance. The below figure shows the connections and phasor diagrams, for Owen’s bridge, under balance conditions.

measurement-of-self-inductance-by-owens-bridge
Measurement of Self Inductance by Owen’s Bridge 

Let

          L1 = unknown self-inductance of resistance

          R2 = variable non-inductive resistance,

          R3 = fixed non-inductive resistance,

          C2 = variable standard capacitor,

          C4 = fixed standard capacitor

At balance,

measurement-of-self-inductance-by-owens-bridge

Advantages of Owen’s Bridge: 

  1. Examining the equations for balance, We find that we obtain two independent equations in case C2 and R2 are made variable. Since R2 and C2, the variable elements, are in the same arm, convergence to balance conditions is much easier.

  2. The balance equations are quite simple and do not contain any frequency component.

  3. Owen’s Bridge can be used over a wide range of measurement of inductances.

Disadvantages of Owen’s Bridge: 

  1. Owen’s bridge requires a variable capacitor which is an expensive item and also its accuracy is about 1 per cent.

  2. The value of capacitance C2 tends to become rather large when measuring high Q coils.

READ HERE  Measurement Of Self Inductance By Maxwell's Bridge

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