
Direct acting indicating analogue electrical measuring instruments and their accessories Part 5: Special requirements for phase meters, power factor meters and synchroscopes
出版:International Electrotechnical Committee

專家解讀視頻
Direct acting indicating analogue electrical measuring instruments and their accessories Part 5: Special requirements for phase meters, power factor meters and synchroscopes
出版:International Electrotechnical Committee
專家解讀視頻