BS EN IEC 60051-4:2021
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Direct acting indicating analogue electrical measuring instruments and their accessories title Special requirements for frequency meters
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07-05-2021
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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