Revised Standard from Last Update.

NATIONAL FOREWORD\

This Indian Standard (Part 4) (Fourth Revision) which is identical with IEC 60051-4 : 2018, ‘Direct acting indicating analogue electrical measuring instruments and their accessories title - Part 4: Special requirements for frequency meters’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on recommendation of the Measuring Equipment for Basic Electrical Quantities Sectional Committee and approval of the Electrotechnical Division Council.

This standard was first published in 1958 and was revised in 1968, 1983 and 2003. The fourth revision of this standard has been undertaken to align it with the latest version of IEC 60051-4 : 2018.