Introduction to AC bridge
The AC bridge is a basic instrument for measuring various AC impedances, such as the capacitance of the capacitor and the inductance of the inductor. In addition, the correlation between AC bridge balance conditions and frequency can be used to measure other physical quantities related to capacitance and inductance, such as mutual inductance, magnetic permeability of magnetic materials, dielectric loss of capacitance, dielectric constant, and power frequency. Both the degree and the sensitivity are very high, and they are widely used in electromagnetic measurement.