GB/T 2423.24:2022 Environmental testing - Part 2: Test methods - Test S: Simulated solar radiation at ground level and guidance for solar radiation testing and weathering
1 Scope
This document specifies the methods for testing equipment or components under simulated solar radiation conditions.
This document is applicable to the equipment and components at the surface of the earth.
The purpose of testing is to investigate to what extent the equipment or components are affected by simulated solar radiation in the presence of moisture to reproduce the weathering effects (temperature, humidity and/or wetting) that occur when they are exposed in actual end-use environments to daylight or to daylight filtered through window glass. This document specifies two test methods, test method Sa: thermal effect test, and test method Sb: weathering test.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60068-1 Environmental testing - Part 1: General and guidance
Note: GB/T 2421-2020 Environmental testing - General and guidance (IEC 60068-1:2013, IDT)
IEC 60068-2-1 Environmental testing - Part 2-1: Tests - Test A: Cold
Note: GB/T 2423.1-2008 Environmental testing for electric and electronic products - Part 2: Test methods - Tests A: Cold (IEC 60068-2-1:2007, IDT)
IEC 60068-2-2 Environmental testing - Part 2-2: Tests - Test B: Dry heat
Note: GB/T 2423.2-2008 Environmental testing for electric and electronic products - Part 2: Test methods - Test B: Dry heat (IEC 60068-2-2:2007, IDT)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60068-1 and the following apply.
3.1
black standard temperature
insulated black panel temperature
characteristic value of the test specimen's(s') surface temperature measured by an insulated black panel thermometer, consisting of a black painted stainless steel panel and a resistance temperature sensor embedded in insulating material (white PVDF, polyvinylidene difluoride) attached
Note 1: More details are described in ISO 4892-1.
Note 2: It is designed to approximate the maximum surface temperature of any material with thermal insulating properties and for control in weathering test apparatus.
3.2
black panel temperature
uninsulated black panel temperature
characteristic value of the test specimen's(s') surface temperature measured by an uninsulated black panel thermometer, consisting of a black painted stainless steel panel and a resistance temperature sensor attached
Note 1: More details are described in ISO 4892-1.
Note 2: It is designed to approximate the maximum surface temperature of any material and for control in weathering test apparatus.
4 General remarks
4.1 Overview
The effect of solar radiation on the test specimen(s) will depend on the level of irradiance, the spectral irradiance, the location, the time of day and the sensitivity of the material of the test specimen(s).
4.2 Irradiance of solar radiation
The irradiance at sea level is influenced by the solar constant and the attenuation and scattering of solar radiation in the atmosphere. For test purposes, CIE 85:1989, Table 4 gives a value of 1,090 W/m2 for the global solar radiation at the surface of the earth from the sun at zenith; this value is based on a solar constant E0=1,367 W/m2.
?
Foreword II
Introduction IV
1 Scope
2 Normative references
3 Terms and definitions
4 General remarks
5 Test method Sa: thermal effect test
6 Test method Sb: Weathering test with or without wetting
7 Information to be given in the relevant specification
8 Information to be given in the test report
Annex A (Informative) Standard solar spectral irradiance
Annex B (Informative) Radiation source
Annex C (Informative) Typical apparatus for weathering
Annex D (Informative) Instrumentation
Annex NA (Informative) Components of standard GB/T 2423
Bibliography
Figure 1 Global solar spectral irradiance at sea level
Figure 2 Test procedures Sa1, Sa2 and Sa3
Figure C.1 Example of test apparatus
Figure C.2 Example of test apparatus with flat array
Table 1 Spectral irradiance
Table 2 Minimum and maximum levels of the relative spectral irradiance
Table 3 Relative spectral irradiance of xenon-arc lamp(s) with daylight filters
Table 4 Relative spectral irradiance for xenon-arc lamp(s) with window glass filters
Table 5 Exposure cycles
Table A.1 Comparison of basic atmospheric conditions used for the solar spectrum defined in ASTM G 177 and that defined in CIE 85:1989, Table 4
Table A.2 Irradiance comparison for the ASTM G 177 solar spectrum and the CIE 85:1989, Table 4, solar spectrum
