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

[中文适用范围]： IEC 60051的这一部分适用于直接作用指示相位计、功率因数计和具有模拟显示器的同步表。本文件还适用于与相位计、功率因数计和同步仪一起使用的不可互换附件（如 IEC 60051-1:2016 的 3.3 中定义）。本文件也适用于其刻度标记不直接对应于其电输入量的相位表或功率因数表，只要它们之间的关系已知。 [外文原描述]： IEC 60051-5:2017 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. This fifth edition cancels and replaces the fourth edition published in 1985. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) updating of content in line with new editions of IEC 60051-1 and IEC 60051-9; b) addition of Annex A to specify the nonconformity classification of test items.