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6: DC and AC Bridges > 6.6 - AC Bridges

6.6 AC BRIDGES

To determine the value of unknown reactive components, an AC input is to be used as the source. Such bridges are classified as AC bridges. In addition, the resistance, the Z, Y, X frequency of the source signal, the Q factor of a coil, the dissipation factor of a capacitor D can also be determined using AC bridges. Balancing of AC bridges is more difficult than DC bridges because both magnitude and phase angle conditions have to be satisfied for balance. The detector must respond to imbalance AC current. Headphones are used as new detectors. No sound signal is heard if the bridge is in balance. A Cathode Ray Oscilloscope (CRO) AC amplifier with an output meter or a tuning eye (electron ray tube indicator) are some of the detectors used for AC bridges.


  

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