In the AC bridge, the four bridge arms are generally composed of AC circuit components such as inductors, resistors, and capacitors. The power supply of the bridge is usually a sinusoidal AC power supply. There are many types of AC balance indicators, which are suitable for different frequency ranges, and the frequency is 200. Hertz can use a resonant galvanometer when it is used. Earphones can be used as an indicator in the audio range. Electronic zero-pointing instruments can also be used for audio or higher frequencies. This circuit uses a high-sensitivity electronic amplification commander. Sensitivity, when the indicator points to zero, the bridge reaches equilibrium.
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