Direct acting indicating analogue electrical measuring instruments and their accessories - Part 7: Special requirements for multi-function instruments (IEC 60051-7:2017); German version EN IEC 60051-7:2018
直接作用模拟指示电测量仪表及其附件.第7部分:多功能仪表的特殊要求(IEC 60051-7-2017);德国版本EN IEC 60051-7:2018