2014UNE-EN 50563:2012/A1:2014 External a.c. - d.c. and a.c. - a.c. power supplies – Determination of no-load power and average efficiency of active modes
2012UNE-EN 50563:2012 External a.c. - d.c. and a.c. - a.c. power supplies - Determination of no-load power and average efficiency of active modes