标准摘要
[中文适用范围]： IEC 60051的本部分适用于以下类型的直接作用指示模拟频率计： 指针式频率计（按IEC 60051-1:2016的3.2.11定义）；振簧频率计（如 IEC 60051-1:2016 的 3.2.12 中定义）。本文件还适用于与频率计一起使用的不可互换附件（如 IEC 60051-1:2016 的 3.3 中定义）。 [外文原描述]： IEC 60051-4:2018 applies to direct acting indicating analogue frequency meters of the following types: • pointer-type frequency meters (as defined in 3.2.11 of IEC 60051-1:2016); • vibrating-reed frequency meters (as defined in 3.2.12 of IEC 60051-1:2016). IEC 60051-4:2018 also applies to non-interchangeable accessories (as defined in 3.1.23 of IEC 60051-1:2016) used with frequency meters. IEC 60051-4:2018 cancels and replaces the fourth edition published in 1984. 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. IEC 60051-4:2018 is to be used in conjunction with IEC 60051-1:2016.
英文名称Direct acting indicating analogue electrical measuring instruments and their accessories title - Part 4: Special requirements for frequency meters