EN 60068-3-4:2002

FOREWORD
INTRODUCTION
1 Scope
2 Definitions
3 Procedures for the production and control of
   humidity
   3.1 General
   3.2 Injection of water (spraying)
   3.3 Injection of water vapour (steam)
   3.4 Saturation type
   3.5 Surface evaporation
   3.6 Aqueous solutions
   3.7 Dehumidification
   3.8 Control of humidity
4 Physical appearance of the effects of humidity
   4.1 Condensation
   4.2 Adsorption
   4.3 Absorption
   4.4 Diffusion
5 Acceleration
   5.1 General
   5.2 Acceleration factor
6 Comparison of steady-state and cyclic tests
   6.1 Test C: Damp heat, steady-state
   6.2 Test Db: Damp heat, cyclic test
   6.3 Sequences of tests and composite tests
7 Influence of test environment on specimens
   7.1 Change of physical characteristics
   7.2 Change of electrical characteristics
   7.3 Corrosion
Annex A (informative) Humidity effects diagram
Bibliography

Provides the necessary information to assist in preparing relevant specifications, such as standards for components or equipment, in order to select appropriate tests and test severities for specific products and, in some cases, specific types of application. The object of damp heat tests is to determine the ability of products to withstand the stresses occurring in a high relative humidity environment, with or without condensation, and with special regard to variations of electrical and mechanical characteristics. Damp heat tests may also be utilized to check the resistance of a specimen to some forms of corrosion attack.