PERTEMAUAN 10 11 AC Bridges dan APLIKASINYA Maxwell

PERTEMAUAN 10 – 11 AC Bridges dan APLIKASINYA

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).

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 :

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 :

Unbalance Conditions

• 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

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

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

Universal Impedance Bridge • Universal impedance bridge

• Bridge configurations of the universal impedance bridge