The low temperature test method for the environmental test method of the communication electroacoustic device is as follows:
1. Place the unpackaged test sample in a low temperature test chamber with room temperature. In order to prevent condensation, the test sample was allowed to be sealed with a plastic film and tested.
2. The temperature of the low temperature test chamber is reduced to an average temperature of less than 10 ° C / min to -55 ° C or -40 ° C temperature, after the test sample reaches temperature stability for 24 h.
3. Take out the test sample and complete the test of the items specified in the detailed product specification within 5 minutes after the removal and 2 hours after the recovery, and the results should meet the requirements of the detailed product specifications.
The above low temperature test method is specified in the SJ 20128-1992 [Communication Electroacoustic Device Environmental Test Method] standard.
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