IEC 60051-4:1984 Direct acting indicating analogue electrical measuring instruments and their accessories. Part 4 : Special requirements for frequency meters
Applies to frequency meters with an analogue indication as well as to non-interchangeable accessories used with them. This fourth edition cancels and replaces the third edition.
IEC 60051-4:1984 history
2018IEC 60051-4:2018 Direct acting indicating analogue electrical measuring instruments and their accessories title - Part 4: Special requirements for frequency meters
1984IEC 60051-4:1984 Direct acting indicating analogue electrical measuring instruments and their accessories. Part 4 : Special requirements for frequency meters