IS 6236 : 2020/IEC 258 : 1968 Direct Recording Electrical Measuring Instruments and Their Accessories

Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (First Revision) which is identical with IEC 258 : 1968 + Amend 1 (1976) ‘Direct recording electrical measuring instruments and their accessories’ 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 originally published in 1971.The first revision of this standard has been undertaken to align it with the latest version of IEC 258 : 1968 + Amend 1 (1976).

The text of the IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.

Only the English language text has been retained while adopting it in this Indian Standard, and as such, the page numbers given here are not the same as in the International Standard.

For the purpose of deciding whether a particular requirement of this standard is complied with the final value, observed or calculated, expressing the result of a test or analysis shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised )’. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.