Categorization of optical devicesDD IEC TS 62538: 2009 applies to optical devices (i. e. elements, components, assemblies, sub assemblies or modules). It provides the definitions of the three main categories of optical devices (i. e. dynamic, active and passive) together with other related definitions. It also gives a general procedure to identify the category of any optical devices. Contents of DD IEC TS 62538: 2009 FOREWORD INTRODUCTION Scope Terms and definitions Categorization of

recognizing that the aims of good lighting go beyond achieving minimum illumination for task performance

But pollutant levels in surface water have a tendency to fluctuate and so it is desirable to monitor pollutant levels over time

designated as “holes” and “shafts”

Tubes delivered in coils

The purpose of this standard is to define safety rules for escalators and passenger conveyors in order to safeguard people and objects against risks of accidents during maintenance and inspection work

as functions of temperature

EN 50131-1:1997

solid fuel

Acute care discharge to home or other ambulatory care environment

EN 10222 (all parts)

It covers the frequency range 0 Hz to 400 GHz

contractors and managers of sites where welding is required