From the 400v DC, 80W o/p source I want to measure the power whether it provides the accurate 80W. How can I test it. is it possible with multimeter or any other technique.
Dear if u don't have any load of 0.2A then u can connect a resistance of 2kohm at the output side for the purpose of 0.2A load.
But resistance should not be less than of 80W.