Predicting Insertion Loss of Common-Core Powerline Filters

Knowledge of the propagation mode and the source impedance is necessary in order to predict the insertion loss of common-core powerline filters. If these quantities are standardized, the transition-band insertion loss corresponding to two test modes can be accurately calculated by use of only a programmable hand calculator, such as the Hewlett-Packard HP65 or Texas Instruments SR56. Such predictions of differential and common-mode insertion loss are of value in designing electronic equipment for conformance to world-wide specifications applying to powerline interference emission and filter leakage current.