The purpose of this test mode is to determine the physical and chemical effects of components and equipment exposed to solar radiation on the Earth surface (e.g. The main characteristics of simulated environment in this experiment are the solar spectral energy distribution and intensity of received energy under the control of temperature and humidity in the test environment. There are three procedures of the test mode (Procedure A: thermal effect evaluation, procedure B: degradation effect evaluation, procedure C: photochemical effect evaluation).
Applicable products:
Electronic products that will be used outdoors for a long time, such as: laptops, mobile phones, MP3&MP4, GPS, automotive electronics, digital cameras, PDAs, video cameras, Bluetooth headphones
Test requirements:
1. Spectral energy distribution shall meet the requirements of specification
2. Illuminance: 1.120KW/m^2 (±10%)=[300-400um, 63 w/m2][The total global radiation of the earth's surface from sun and sky vertical is 1.120KW/m^2]
3. Before the test temperature and humidity is 40℃(±2)/93%(±3)R.H.
4. This test needs to control the humidity environment
5. During irradiation, temperature in the chamber rises to specified temperature (40℃, 55℃) at a linear rate.
6. Temperature in the chamber should start to rise 2 hours before irradiation
7. Temperature in the dark chamber should be decreased linearly and maintained at 25℃
8. Temperature error: ±2℃
9. Temperature measurement point in the chamber is taken from the test distance of 1m from the specimen or half of the chamber wall distance (the smaller one)
Spectral energy distribution and tolerance error range of Xenon lamp (according to the requirements of International Illuminance Commission CIE)
The specification requires that the spectrum output by its xenon lamp must be output in accordance with the requirements of International Illuminance Commission CIE. Therefore, the equipment manufacturer of the weather testing machine must have the equipment (spectrometer) and technical capability to verify the xenon lamp spectrum (provide xenon lamp verification report).
Test procedure evaluation description:
According to IEC68-2-5&IEC-68-2-9, there are three test methods for light resistance test, which includes program A: thermal effect, B: degradation effect, C: photochemistry. Among these three methods, procedure A is the most severe test method, which will be detailed in the following article.
Three test procedures: Procedure A: thermal effect (most severe natural conditions), B: degradation effect (22.4KWh/m2 per day), C: photochemistry
Program A: Thermal effect
Test conditions: 8 hours of exposure, 16 hours of darkness, total 24 hours per cycle, three cycles are required, and total exposure of each cycle is 8.96KWh/m2
Procedure A test precautions: In the test process of program A, the xenon lamp is not lit immediately at the beginning of the test, according to the requirements of the code, it must be lit after 2 hours of the test, closed at 10 hours, and the total irradiation time of a cycle is 8 hours. During the lighting process, the temperature in the furnace rises linearly from 25℃ to 40℃ or 55℃(satisfying all environments in the world), and decreases linearly at 10 hours to 25℃ for 4 hours, with a linear slope (RAMP) of 10 hours.
Test procedure B: Degradation effect
Test conditions: Temperature and humidity in the first four hours of the test is 93%, irradiation for 20 hours, darkness for 4 hours, total 24 hours per cycle Total exposure for each cycle is 22.4KWh/m 2 cycles: 3 days: commonly used, 10 days, 56 days
Procedure B test precautions: Procedure B test is the only test condition for humidity control during light resistance test in IEC68-2-5 specification. The specification requires that the temperature and humidity conditions are (40±2℃/93±3%) within four hours from the beginning of the test [supplementary description in IEC68-2-9] humidity environment, which should be paid attention to when conducting the test. At the beginning of the program B test, the temperature was raised from 25℃ linear slope (RAMP: 2 hours) to 40℃ or 55℃, maintained for 18 hours, and then the linear cooling (RAMP: 2 hours) returned to 25℃ for 2 hours to complete a cycle of experiments. Remarks: IEC68-2-9 = Solar Radiation Test Guidelines
Test procedure C: Photochemistry (Continuous Irradiation)
Test conditions: 40℃ or 55℃, continuous irradiation (depending on the time required)
Procedure C test notes: After linear temperature rise (RAMP: 2 hours) from 25℃ to 40℃ or 55℃, the continuous irradiation test is carried out at a fixed temperature before the end of the test. The irradiation time is determined according to the characteristic (characteristics) of the product to be tested in the test, which is not clearly specified in the specification.
