NF C97-053/A1*NF EN 50563/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
2014NF C97-053/A1*NF EN 50563/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