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**AC Bridges dan APLIKASINYA**

PERTEMAUAN 10 – 11 AC Bridges dan APLIKASINYA

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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).

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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 :

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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 :

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Unbalance Conditions

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**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

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**Wien Bridge Applications :**

Frequency measureent Notch filter Frequency-determining element Frequency measurement with the Wien bridge

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**Wagner Ground Connection**

The wagner ground connection eliminates the effect of stray capacitances across the detector

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**Universal Impedance Bridge**

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**Bridge configurations of the universal impedance bridge**

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