Direct acting indicating analogue electrical-measuring instruments and their accessories - Part 1: Definitions and general requirements common to all parts (IEC 60051-1:1997); German version EN 60051-1:1998— 25 стр.
Direct acting indicating analogue electrical measuring instruments and their accessories; part 2: special requirements for ammeters and voltmeters (IEC 60051-2:1984, edition 4); german version EN 60051-2:1989— 7 стр.