• AS 60068.3.1-2003

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    Environmental testing Background information - Section one: Cold and dry heat tests

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Withdrawn date:  01-30-2019

    Language(s):  English

    Published date:  01-01-2003

    Publisher:  Standards Australia

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    Table of Contents - (Show below) - (Hide below)

    1 - AS 60068.3.1-2003 ENVIRONMENTAL TESTING - BACKGROUND INFORMATION - SECTION ONE: COLD AND DRY HEAT TESTS
    4 - PREFACE
    5 - CONTENTS
    7 - 1 Introduction
    7 - 1.1 Reference ambient conditions
    7 - 1.2 Devices without heat dissipation
    7 - 1.3 Devices with heat dissipation
    8 - 1.4 Ambient temperature
    8 - 1.5 Surface temperatures
    8 - 2 Reasons for the differing test procedures
    8 - 2.1 Mechanisms of heat transfer
    8 - 2.1.1 Convection
    9 - 2.1.2 Thermal radiation
    10 - 2.1.3 Thermal conduction
    10 - 2.1.4 Forced air circulation
    11 - 3 Test chambers
    11 - 3.1 General
    12 - 3.2 Methods of achieving the required conditions in the test chamber
    12 - 3.2.1 Design of chambers for simulating the effect of free air condition
    12 - 3.2.2 Design of chambers with forced air circulation
    13 - 3.2.3 Emissivity coefficient of walls
    13 - 3.2.4 Thermal characteristics of mounting devices
    13 - 4 Measurements
    13 - 4.1 Temperature
    13 - 4.2 Air velocity
    13 - 4.3 Emissivity coefficient
    14 - Annex A - Effects of size of chamber on surface temperature of a specimen when no forced air circulation is used
    16 - Annex B - Effect of airflow on chamber conditions and on surface temperatures of test specimens
    16 - B.1 Calculation of the effect on airflow on specimen temperature and on temperature gradient in the chamber
    20 - Annex C - Effect of specimen emissivity coefficient on temperature rise
    21 - Annex D - Effect of wire termination dimensions and material on surface temperature of a component
    22 - Annex E - Heat transfer calculations and nomograms
    22 - E.1 Nomenclature
    22 - E.2 Heat transfer by radiation
    23 - E.3 Heat transfer by radiation and convection
    24 - E.4 Correlation nomograms used in Test A and Test B
    29 - Annex F - Thermal conductivities of common materials
    30 - Annex G - Measurement of temperature
    30 - G.1 General
    30 - G.2 Methods using colour changing or melting effects
    31 - G.3 Methods using infra-red sensors
    32 - Annex H - Measurement of air velocity
    33 - Annex J - Measurement of emissivity coefficient
    33 - J.1 Introduction
    33 - J.2 Radiation theory
    34 - J.3 Practical applications of radiation theory
    35 - J.4 Methods of measurements of emissivity coefficient
    36 - J.5 Emissivity coefficient values
    37 - J.6 Methods of increasing the emissivity of test chamber walls
    41 - Annex K - General block diagram, cold and dry heat tests

    Abstract - (Show below) - (Hide below)

    Describes cold and dry heat testing, with both sudden and gradual change of the temperature, and of non-heat-dissipating and heat-dissipating specimens (the latter with or without artificial cooling).

    General Product Information - (Show below) - (Hide below)

    Committee EL-026
    Document Type Standard
    Product Note Withdrawn 30-01-2019.
    Publisher Standards Australia
    Status Withdrawn
    Supersedes

    History - (Show below) - (Hide below)

    First published as AS 1099.3.1-1980.Revised and redesignated as AS 60068.3.1-2003. First published as AS 1099.3.1-1980. Revised and redesignated as AS 60068.3.1-2003.

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