Kapacitansbryggor

Kapacitansbryggor are electronic circuits used to measure unknown capacitance values. They operate on the principle of a Wheatstone bridge, adapted for capacitance measurement. A typical capacitance bridge consists of four arms, two of which contain known impedances, one contains a known variable capacitance, and the fourth contains the unknown capacitance to be measured. An alternating current (AC) source is applied to the bridge. When the bridge is balanced, meaning there is no voltage difference across the detector, the unknown capacitance can be calculated from the values of the known impedances and the variable capacitance. The balancing condition depends on the specific configuration of the bridge, but it generally involves equating the ratio of impedances in one arm to the ratio of impedances in the opposite arm. Common types of capacitance bridges include the De Sauty bridge and the Schering bridge, each with slightly different arrangements of resistors and capacitors. These bridges are valuable tools in electronics manufacturing, research, and repair for characterizing and verifying capacitor performance. They are particularly useful for determining small capacitance values or when high accuracy is required.