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DIN 57558-3 ; DIN VDE 0558-3:1977-08 ; VDE 0558-3:1977-08 [Withdrawn] references following documents:

Document number Edition Title
DIN 41755-1 1970-01 Denomination of the ripple of d.c voltage, periodic deviations; terms and measuring methods More 
DIN 41756-2 1973-05 Static power convertors; duty of power convertors, typers of d.c. load More