1 - AS 1099.3.1-1980 BASIC ENVIRONMENTAL TESTING PROCEDURES FOR ELECTROTECHNOLOGY - BACKGROUND INFORMATION - TESTS A AND B; COLD
1 - CONTENTS
1 - FOREWORD
2 - SPECIFICATION
2 - 1 SCOPE AND APPLICATION.
2 - 2 REFERENCE AMBIENT CONDITIONS.
2 - 3 DEVICES WITHOUT HEAT-DISSIPATION.
2 - 4 DEVICES WITH HEAT-DISSIPATION.
2 - 5 AMBIENT TEMPERATURE.
2 - 6 SURFACE TEMPERATURES.
2 - 7 MECHANISMS OF HEAT TRANSFER.
2 - 7.1 Convection.
3 - 7.2 Thermal Radiation.
3 - 7.3 Thermal Conduction.
4 - 7.4 Forced Air Circulation.
4 - 8 TEST CHAMBERS.
4 - 8.1 General.
5 - 8.2 Methods of Achieving the Required Conditions in the Test Chamber.
5 - 9 MEASUREMENTS.
5 - 9.1 Temperature.
5 - 9.2 Air Velocity.
5 - 9.3 Emissivity Coefficient.
6 - APPENDIX A - GENERAL BLOCK DIAGRAM, COLD AND DRY HEAT TESTS
7 - APPENDIX B - EFFECT OF AIRFLOW ON CHAMBER CONDITIONS AND ON SURFACE TEMPERATURES OF TEST SPECIMENS
7 - B1 CALCULATION OF THE EFFECT OF AIRFLOW ON SPECIMEN TEMPERATURE AND ON TEMPERATURE GRADIENT IN THE CHAMBER.
7 - B1.1 Specimen Temperature.
7 - B1.2 Gradient Between Incoming and Outgoing Air.
11 - APPENDIX C - EFFECTS OF SIZE OF CHAMBER ON SURFACE TEMPERATURE OF A SPECIMEN WHEN NO FORCED AIR CIRCULATION IS USED
13 - APPENDIX D - EFFECT OF SPECIMEN EMISSIVITY COEFFICIENT ON TEMPERATURE RISE
14 - APPENDIX E - MEASUREMENT OF EMISSIVITY COEFFICIENT
14 - E1 INTRODUCTION.
14 - E2 RADIATION THEORY.
15 - E3 PRACTICAL APPLICATIONS OF RADIATION THEORY.
15 - E3.1 Error Magnitudes.
15 - E3.2 Wavelength Range and Energy Distribution of the Temperature Radiation.
15 - E3.3 Total Radiation.
16 - E4 METHODS OF MEASUREMENTS OF EMISSIVITY COEFFICIENT.
16 - E4.1 General.
16 - E4.2 Measurements of the Value of the Emissivity Coefficient.
17 - E4.3 Check to Ensure that a Minimum Value of Emissivity Coefficient is Exceeded.
17 - E5 EMISSIVITY COEFFICIENT VALUES.
17 - E6 METHODS OF INCREASING THE EMISSIVITY OF TEST CHAMBER WALLS.
17 - E6.1 Coatings and Other Surface Treatments.
17 - E6.2 Mechanical Structures.
21 - APPENDIX F - HEAT TRANSFER CALCULATIONS AND NOMOGRAMS
21 - F1 NOMENCLATURE.
21 - F2 HEAT TRANSFER BY RADIATION.
21 - F3 HEAT TRANSFER BY RADIATION AND CONVECTION.
21 - F3.1 Heat Transfer.
22 - F3.2 Nomograms.
22 - F4 CORRELATION NOMOGRAMS USED IN TEST A AND TEST B.
27 - APPENDIX G - EFFECT OF WIRE TERMINATION DIMENSIONS AND MATERIAL ON SURFACE TEMPERATURE OF A COMPONENT
28 - APPENDIX H - THERMAL CONDUCTIVITIES OF COMMON MATERIALS
29 - APPENDIX J - MEASUREMENT OF TEMPERATURE
29 - J1 GENERAL.
29 - J2 METHODS USING COLOUR CHANGING OR MELTING EFFECTS.
30 - J3 METHODS USING INFRARED SENSORS.
31 - APPENDIX K - MEASUREMENT OF AIR VELOCITY