AS 1099.2.28-1994

1 - AS 1099.2.28-1994 BASIC ENVIRONMENTAL TESTING PROCEDURES FOR ELECTROTECHNOLOGY - TESTS - GUIDANCE FOR DAMP HEAT TESTS
4 - PREFACE
6 - CONTENTS
7 - 1. Scope and object
7 - 2. Environmental influence of damp heat
8 - 3. Definitions
9 - 4. Procedures for the production of humidity
9 - 4.1 General
9 - 4.2 Water spraying
9 - 4.3 Injection of water vapour
10 - 4.4 Volatilization
10 - 4.4.1 Bubbling-through type
10 - 4.4.2 Surface volatilization
10 - 4.5 Aqueous solutions
10 - 5. Physical appearance of humidity
10 - 5.1 Condensation
11 - 5.2 Adsorption
12 - 5.3 Absorption
12 - 5.4 Diffusion
12 - 6. Physical processes acceleration
12 - 6.1 General
12 - 6.2 Acceleration factor
13 - 7. Comparison of steady state and cyclic tests
13 - 7.1 Steady state tests, Test Ca and Test Cb
13 - 7.1.1 Test Ca
13 - 7.1.2 Test Cb
13 - 7.2 Cyclic test, Test Db
14 - 7.3 Sequences of tests and composite tests
15 - 8. Influence of test environment on specimens
15 - 8.1 Change of physical characteristics
15 - 8.2 Change of electrical characteristics
15 - 8.2.1 With surface moisture
15 - 8.2.2 With penetrated moisture
16 - 8.3 Corrosion
17 - APPENDIX A - HUMIDITY EFFECTS DIAGRAM
17 - A1. General
17 - A2. Explanatory notes
17 - A2.1 Water penetration
18 - A2.2 Physical process
18 - A2.3 Effects
18 - A2.4 Examples of effects

Determines the ability of electrotechnical products to withstand the stresses occurring in a climate of high relative humidity, with or without condensation, with special regard to variations of electrical and mechanical characteristics. Provides guidance for Tests Ca (AS 1099.2.3), Cb (IEC 68-2-56), Db (IEC 68-2-30) and Z/AD (AS 1099.2Z/AD). The Standard is identical with and has been reproduced from IEC 68-2-28:1990.

This guide includes the necessary information for those experts who, when preparinga relevantspecification(e g. standards for components or equipment), have to select the appropriate tests and test severities for a particular product and possibly a given kind of application.The object of damp heat tests is to determine the ability of electrotechnical products to withstand the stresses occurring in a climate of high relative humidity, with or without condensation, with special regard to variations of electrical and mechanical characteristics. Damp heat tests may also be applied to check the resistance of a specimen to some forms of corrosion attack (see Sub-clause 8.31.This guide should be used together with the following parts of IEC Publication 63 which contain damp heat tests i.e.:68-2-3: Test Ca: Damp heat, steady state.68-2-56: Test Cb: Damp heat, steady state, primarily for equipment68-2-30: Test Db and guidance: Damp heat, cyclic (12 + 12-hour cycle).68-2-38: Test Z/AD: Composite temperature/humiditycyclic test.

First published as part of AS C333-1963.
Revised and redesignated in part as AS 1099.1-1971.
Revised and redesignated in part as AS 1099.3.3-1982.
Revised and redesignated AS 1099.2.28-1994.