IEC 60747-5-13:2021 pdf free download

IEC 60747-5-13:2021 pdf free download Semiconductor devices – Part 5-13: Optoelectronic devices – Hydrogen sulphide corrosion test for LED packages
For the total volume and the total surface area of the test specimens, the provisions in 7.2 of IEC 60068-2-60:201 5 shall be applied.
Adequate precautions shall be taken to ensure that the luminous/radiant flux and electric performances are not disturbed during the exposure period.
In the exposure period, the number of specimens in the test chamber should not be changed.
The specimens shall be exposed without any electrical load or as required by the detail specification.
The specimens shall be continuously exposed to the test atmosphere for a duration as required by the detail specification and the following steps:
The gas concentrations set up of test atmosphere is recommended in Annex D; ? Set the test specimens in the working volume of the test chamber, after the specified temperature is stabilized, start the flow of humid air, allow to stabilize and adjust temperature and humidity not to accumulate the condensation on the inner wall of the test chamber and the surface of the test specimen;
Start the flow of the gases into the humid air stream and allow to be stabilized. Exposure period shall be counted from the time the gas is started to flow;
Measure and adjust, if necessary, temperature, humidity and gas concentrations. During these adjustments, any overshooting of gas concentration shall be avoided. Maximum allowed duration of this period of stabilization and adjustments, to prescribed values, is 24 h;
During the course of testing, temperature, humidity and gas concentrations shall be kept within the prescribed limits;
At the end of the test period, remove the specimens after the humidity in the chamber is decreased around room temperature and RH of 75 % to avoid condensation.
7.3 Final measurements
The specimens shall be removed from the chamber and stored under standard recovery conditions specified in IEC 60068-1 for not less than 1 h before luminous/radiant flux and electric measurements are made. The measurements should be done in 2 h after the removal from the chamber if the measurements cannot be done within the specified time, they shall be performed within up to 24 hours after the removal from the chamber. In that case, the specimens shall be kept under standard recovery condition specified in IEC 60068-1 , and such situation shall be mentioned in the test report with the period of storage.
Adequate precautions shall be taken to ensure that the luminous/radiant flux and electric performances are not disturbed. The method used for measuring the luminous/radiant flux and the electric performances should be the same as used for the initial measurement.
Treatment of the specimens before final measurements and the details of measurements shall be made as required by the relevant specification.
Visual inspection of the specimens may be required by the detail specification.