IEC 60051-5-2017 直接作用模拟指示电测量仪表及其附件--第5部分:相位表、功率因数表和同步指示器的特殊要求 Direct acting indicating analogue electrical measuring instruments and their accessories – Part 5: Special requirements for phase meters, power factor meters and synchroscopes

This part of IEC 60051 applies to direct acting indicating phase meters, power factor meters and synchroscopes having an analogue display. 
This document also applies to non-interchangeable accessories (as defined in 3.1.23 of 
IEC 60051-1:2016) used with phase meters, power factor meters and synchroscopes. 
This document also applies to a phase meter or power factor meter whose scale marks do not correspond directly to its electrical input quantity, provided that the relationship between them is known.dition 5.0 2017-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Direct acting indicating analogue electrical measuring instruments and their accessories – Part 5: Special requirements for phase meters, power factor meters and synchroscopes Appareils mesureurs électriques indicateurs analogiques à action directe et leurs accessoires – Partie 5: Exigences particulières pour les phasemètres, les appareils de mesure de facteur de puissance et les synchronoscopes IEC 60051-5: