Electronic power subsystems is an integral part of any electronic system. They perform the task of power processing, management, and distribution. To develop an IEEE Rec. Practice for electronic power subsystems. It includes parameter definitions, parameter test conditions, and parameter test methods. It is intended for dc, single-phase, or three-phase ac electronic subsystems with power level up to 20 KW, voltage level up to 600 V, and frequency up to 400 Hz.