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Understanding Various Types of Bridges for Inductance and Capacitance Measurement

This document explores several key electrical bridge configurations used for measuring inductance and capacitance. It discusses the Maxwell Bridge, ideal for medium-Q coils, and the Hay Bridge, which is better suited for high-Q measurements. The Schering Bridge is highlighted for capacitor measurement, while the Wien Bridge is presented for frequency measurement applications. Additionally, the importance of the Wagner Ground Connection in eliminating stray capacitances is explained, along with an overview of universal impedance bridge configurations.

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Understanding Various Types of Bridges for Inductance and Capacitance Measurement

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  1. PERTEMAUAN 10 – 11 AC Bridges dan APLIKASINYA

  2. Maxwell Bridge • The Maxwell bridge measures an unknown inductance in terms of a known capacitance. • The maxwell bridge is limited to the measurement of medium-Q coils (1<Q<10).

  3. Hay Bridge • The Hay circuit is more convenient for measuring high-Q coils • Hay bridge for inductance measurements --------------------- • Impedance triangles illustrate inductive and capacitive phase angles -------------------------------- • for Q>10 :

  4. Schering Bridge • The Schering bridge, one of the most important bridges, is used extensively for the measurement of capacitors. • Schering bridge for measurement of capacitance -------------------- • Dissipation factor :

  5. Unbalance Conditions

  6. Bridge balancing problem : • (a) unbalanced condition • (b) bridge balance is restored by adding a resistor to arm 1 (maxwell configuration) • (c) Alternative method of restoring bridge balance, by adding a capacitor to arm 3

  7. Wien Bridge • Applications : • Frequency measureent • Notch filter • Frequency-determining element • Frequency measurement with the Wien bridge -----------------------

  8. Wagner Ground Connection • The wagner ground connection eliminates the effect of stray capacitances across the detector

  9. Universal Impedance Bridge • Universal impedance bridge

  10. Bridge configurations of the universal impedance bridge

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