I.S. EN 61920:2004

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
   4.1 General
   4.2 Radiators
   4.3 Receivers
5 Classification
   5.1 General
   5.2 Physical characteristics of radiators
        5.2.1 General
        5.2.2 Ranges of wavelength (criterion 1)
        5.2.3 Ranges of frequency (criterion 2)
        5.2.4 Radiant intensity (criterion 3)
        5.2.5 Angle of radiation (criterion 4)
        5.2.6 Duration of radiation (criterion 5)
        5.2.7 Identification example for a radiator
   5.3 Physical characteristics of receivers
        5.3.1 General
        5.3.2 Ranges of wavelength and selectivity
               (criterion 6)
        5.3.3 Frequency response (criterion 7)
        5.3.4 Sensitivity (criterion 8)
        5.3.5 Directivity (criterion 9)
        5.3.6 Example of a receiver
   5.4 Tolerances
        5.4.1 Measurement conditions
        5.4.2 Tolerances
   5.5 Product groups
   5.6 User areas
   5.7 Graphical representation of IR systems
6 Method for minimizing mutual interferences
7 Marking
8 Relationship between IR basic standard and application
   standards
Annex A (informative) Example for possible priorization
Annex B (informative) Examples of lambda/f-diagrams
Annex C (informative) Survey of standardization activities
                      in the field of infrared
Bibliography

Specifies the classification of IR devices into groups and classes in order to identify and clarify problems caused by mutual interference.