Excerpts of LED high and low temperature working test
With the widespread use of LEDs, the detection of product quality and reliability has become increasingly important. One of the most important tests is the high and low temperature test chamber. Based on years of practice, Qinzhuo Environmental Testing Technology specially selected some LED high and low temperature test solutions for display, so that LED manufacturers can refer to them. About purchasing high and low temperature
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6. Test method
6.1 Appearance and structure inspection
6.1.1 Appearance inspection: visual inspection, appearance should meet the requirements of 5.1.1.
6.1.2 Size inspection: use a tape measure or similar tool to measure, the size should meet the requirements of 5.1.2.
6.1.3 Material inspection: visual inspection, the material should meet the requirements of 5.1.3.
6.1.4 Assembly inspection: visual inspection, if necessary, pass the test inspection in section 4.12 of GB7000.1-2002, and the assembly should meet the requirements of 5.1.4.
6.2 Environmental condition test
6.2.1 High and low temperature working test
The test shall comply with the provisions of 5.2.1; the test temperature shall be -25 ° C and + 40 ° C, and the test time shall be 96 ± 2 hours each.
6.2.1.1 High temperature working test
Carry out according to the Bd category specified in GB / T2423.2.
6.2.1.1.1 Initial inspection
Test the sample in an indoor environment with an ambient temperature of 25 ° C ± 5 ° C and a relative humidity of 55% ± 5% RH, check the appearance and structure, and pass the current with rated voltage and rated frequency, refer to EN13201-3 and EN13201- 4 method or similar national and industry standards to measure the average illuminance of the LED lamps, and then in the dark room, project the light emitted by the LED luminaires on the wall 2.0m away from the street lamp and other body plane to measure the illuminance distribution of the street lamps The device measures all included angles of the long and wide sides of the rectangle and the length, width and area of ​​the rectangle, measures the illuminance distribution of the street lamp, and records the values ​​of each included angle, all side lengths, and overall area.
6.2.1.1.2 Conditional test
a) Put the test sample at room temperature into the test box without packaging and power on, and then adjust the temperature of the test box to the specified (40 ± 3) ℃.
b) Bring the temperature of the test chamber to the specified test temperature.
C) At this temperature, the test sample is energized for 96 hours at the rated voltage and rated frequency, and the duration should start from the time when the temperature reaches stability.
d) Cut off the power supply of the test box, remove the test sample from the box and restore it for 2 hours at room temperature.
6.2.1.1.3 Final inspection
Test the sample in an indoor environment with an ambient temperature of 25 ° C ± 5 ° C and a relative humidity of 55% ± 5% RH, check the appearance and structure, and then pass the current with the rated voltage and rated frequency, the same as 6.2.1.1 Measure the average illuminance and illuminance distribution of LED lamps under measurement conditions.
6.2.1.1.4 Judgment of test results
By visual inspection, the appearance and structure of the LED lamps should have no obvious changes before and after the test, and the average illuminance of the final inspection should not be less than 95% of the average illuminance of the initial inspection. The rectangular area of ​​the illuminance distribution diagram and the initial inspection The deviation does not exceed 10%, the deviation of the length or width of any side of the rectangle from the initial detection does not exceed 5%, and the angle between the length and width of the rectangle does not exceed 5 degrees from the initial detection.
6.2.1.2 Low temperature working test
Carry out according to the Ad category specified in GB / T2423.1.
6.2.1.2.1 Initial inspection
According to 6.2.1.1.1
6.2.1.2.2 Conditional test
a) Put the test sample at room temperature into the test box without packaging and power on, and then adjust the temperature of the test box to the specified (-25 ± 3) ℃.
b) At this temperature, the test sample is energized for 96 hours at the rated voltage and rated frequency, and the duration should be calculated from the time when the temperature reaches stability.
C) The test sample is kept at this temperature for 96h, and the duration should start from the time when the temperature reaches stability.
d) Cut off the power supply of the test box, remove the test sample from the box and restore it for 2 hours at room temperature.
6.2.1.2.3 Final inspection
Follow 6.2.1.1.3
6.2.1.2.4 Judgment of test results
Follow 6.2.1.1.4.
6.2.2 High and low temperature storage test
The test should comply with the provisions of 5.2.2; the test temperature is -40 ℃ and +85 ℃, the test time is 96 ± 2 hours.
6.2.2.1 High temperature storage test
Carry out according to category Bb specified in GB / T2423.2
6.2.2.1.1 Initial inspection
Follow 6.2.1.1.1.
6.2.2.1.2 Conditional test
a) Put the test sample at room temperature into the test box without packaging and without electricity, and then adjust the temperature of the test box to the specified (85 ± 3) ℃.
b) Restore the temperature of the test chamber to the specified test temperature.
C) The test sample is kept at this temperature for 96h, and the duration should start from the time when the temperature reaches stability.
d) Cut off the power supply of the test box, remove the test sample from the box and restore it for 2 hours at room temperature.
6.2.2.1.3 Final inspection
Follow 6.2.1.1.3.
6.2.2.1.4 Test result judgment
Follow 6.2.1.1.4.
6.2.2.2 Low temperature storage test
Carry out according to the category Ab specified in GB / T2423.1.
6.2.2.2.1 Initial inspection
Follow 6.2.1.1.1.
6.2.2.2.2 Conditional test
a) Put the test sample at room temperature into the test box without packaging and without electricity, and then adjust the temperature of the test box to the specified (-40 ± 3) ℃.
b) Restore the temperature of the test chamber to the specified test temperature.
C) The test sample is kept at this temperature for 96h, and the duration should start from the time when the temperature reaches stability.
d) Cut off the power supply of the test box, remove the test sample from the box and restore it for 2 hours at room temperature. The test sample should be recovered at room temperature until thawing. To remove water droplets, the test sample can be shaken by hand.
6.2.2.2.3 Final inspection
Follow 6.2.1.1.3.
6.2.2.2.4 Judgment of test results
Follow 6.2.1.1.4.
6.2.3 Environmental test
The test shall comply with the provisions of 5.2.3; the test temperature shall be conducted under the conditions of 40 ° C and relative humidity of 95% RH, and the test time shall be 96 ± 2 hours each.
6.2.3.1 Constant damp heat test
According to the provisions of GB / T2423.3.
6.2.3.1.1 Initial inspection
Follow 6.2.1.1.1.
6.2.3.1.2 Conditional test
The test sample is put into the damp heat box according to the normal working state. The test sample is not energized, start the power of the damp heat box to make the temperature in the box rise to 40 ℃ ± 3 ℃, then, humidify and stir the air in the box, when the temperature reaches the requirements, the relative humidity is (95 ± 3)%, keep 96h Afterwards, the test sample was taken out of the box and recovered at room temperature for 2h.
6.2.3.1.3 Final inspection
Follow 6.2.1.1.3.
6.2.3.1.4 Test result judgment
Follow 6.2.1.1.4.
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