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This part of IEC 60068-2 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 these tests is to investigate to what extent equipment or components are affected by solar radiation. This document specifies two test methods, test method Sa: thermal effect test, and test method Sb: weathering test. Test method Sa is intended to investigate thermal effects caused by direct exposure to solar radiation, including material deformation, differential thermal expansion and contraction of components, component thermal failure, and other degradation mechanisms caused or initiated primarily by the heat generated by the visible and infrared bands of solar radiation. Test method Sb is intended to simulate the combined effects of solar radiation with temperature and wetting, especially concerning photodegradation of polymers and other materials caused primarily by ultraviolet radiation in the presence of moisture and heat, a process known as weathering.
Although there exists some overlap between the two methods, they are typically performed with different artificial light sources and for different durations. The spectral irradiance defined in test method Sa includes a close match to a standard solar radiation spectrum in the visible in infrared bands, but does not have as close a match in the ultraviolet band. The light source defined in test method Sb has a more precise match to a standard solar radiation spectrum in the ultraviolet range, a good match in the visible light range, but a less accurate match in the infrared range. Although there can be practical reasons to perform tests that intend to simultaneously measure both thermal and weathering effects, caution is advised because weathering effects can take longer to manifest themselves than thermal effects and because the closeness of the match between the artificial light source and the standard solar radiation spectrum in the ultraviolet range can have a significant effect on the test results.
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