BS 89-1:1990 EN 60051-1:1989 IEC 51-1:1984 Directing indicating analogue electrical measuring instrumnets and their accessories - Part 1:Specification for definitions and general requirements common to all Parts 直接作用模拟指示电测量仪表及其附件 第1部分：定义和对所有部分通用的一般要求 EN 60051-1 1989
BS EN 60051-1:1999 IEC 60051-1:1997 Derect acting indicationg analogue electrical measureing instruments and their accessories - Part 1:Definitions and general requirements common to all parts EN 60051-1 1999
BS 89-2:1990 EN 60051-2:1989 IEC 51-2:1984 Part 2:Specification for special requirements for ammeters and voltmeters EN 60051-2 1989
BS 89-4:1990 EN 60051-4:1989 IEC 51-4:1984 Part 4:Specification for special requirements for frequency meters EN 60051-4 1989
BS 89-5:1990 EN 60051-5:1989 IEC 51-5:1984 Part 5:Specification for special requirements for phase meters,power factor meters and synchroscopes EN 60051-5 1989
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