ČSN EN IEC 60051-4

This part of IEC 60051 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). This document also applies to non-interchangeable accessories (as defined in 3.1.23 of IEC 60051-1:2016) used with frequency meters. Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60051-1:2016, Direct acting indicating analogue electrical measuring instruments and their accessories - Part 1: Definitions and general requirements common to all parts IEC 60051-9, Direct acting indicating analogue electrical measuring instruments and their accessories - Part 9: Recommended test methods