Direct acting indicating analogue electrical measuring instruments and their accessories. Part 4: Special requirements for frequency meters (IEC 60051-4:2018)
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.
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