Mold test of environmental test method for communication electroacoustic device
The mold test method for the environmental test method of the communication electroacoustic device is as follows:
1. Spray the mixed spore suspension with a sprayer (or other atomizing device) onto the surface of the test sample subjected to the tidal treatment and the surface of the control strip as specified in 4.1.4.4 of the 412 Mold Test in GJB367.2. Fine mist.
2. Transfer the test sample and control strip after the mold spores into the test chamber and start calculating the test period.
3. The mold test chamber is released every day according to the following conditions until the predetermined number of cycles:
a, temperature: 30 ± 1 ° C, relative humidity: 90% ~ 100%, lasting 20h;
b, temperature: 25 ± 1 ° C, relative humidity: 95% ~ 100%, lasting 2h;
c. The temperature and humidity gradation time is completed within 1~2h. During the shift, the temperature must be maintained between 24 and 31 ° C and the relative humidity is above 90%.
4. After 7 days of culture in the mold test chamber, no mold growth was observed in the control strip, the test was invalid, the cause should be analyzed, the unfavorable factors should be excluded, and the test should be restarted. In the test, if the test is interrupted due to abnormalities in the test equipment, refer to Appendix A (Reference) for treatment.
5. Test cycle every 7d in the test chamber. When changing the air, it should be combined with the temperature and humidity alternating cycle time of the mold test chamber to avoid frequent changes in temperature and humidity in the test chamber.
6. Immediately after the end of the test period, the visual inspection shall be carried out, and the mold growth area shall not be damaged during the inspection. Visual inspection, visual growth, growth density and thickness were observed. The results of the mold growth test were evaluated in accordance with the SJ 20128-1992 standard table 8.
7. After the appearance inspection and recovery for 1h, the test items shall be tested according to the detailed specifications of the product, and the results shall comply with the requirements of the detailed specifications of the product.
The above mold test method is specified in the SJ 20128-1992 [Communication Electroacoustic Device Environmental Test Method] standard.
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