New Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Part 73) which is identical to ISO 25178-73 : 2019 ‘Geometrical product specifications (GPS) - Surface texture: Areal - Part 73: Terms and definitions for surface defects on material measures’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Engineering Metrology Sectional Committee and approval of the Production and General Engineering Division Council.

This document is based on the premise that a material measure has a real geometrical surface which is a realization of an ideal or nominal surface, which in turn can in most cases be regarded as a simple mathematical concept, for example, a plane, a sphere, a step function or a sinusoidal shape. In each case, there will be an associated precisely known quantity, which is used when the material measure is measured by a surface texture-measuring instrument in one or more operations during the calibration and set-up of that instrument.