MEASUREMENTS FOR DC CHOKES
What Is DC Bias And When Should It Be Tested?
In the context of a transformer or choke, DC bias relates to a constant current element that is added to the AC signal. Many wound components must operate with DC currents flowing through them and, during the design stage, it is necessary to establish that the component will function correctly with the specified current. In the case of production testing however, it is possible to confirm the correct assembly, and therefore correct operation of a wound component, without applying a DC bias. This tech note discusses the issue in some detail and explains how production facilities may identify good components with complete confidence in the absence of a DC bias generator.