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将没有操作干扰过的咪头在70±3℃高温下试验48小时，试验后在常温下放置3小时后测试，灵敏度变化在±3dB内。
(4) Isotherm & ISO-humidity Test恒温恒湿试验
To be no interference in operation after storage test at temperature 55±3℃ and relative humidity (95±3%) for 48 hours, the sensitivity to be within ±3dB from initial sensitivity, the measurement should be done after 3 hours at the room temperature.
将没有操作干扰过的咪头在温度55±3℃、相对湿度95±3%的环境下试验48小时，试验后在常温下放置3小时后测试，灵敏度变化在±3dB内 。
(5) Low Temperature Test 低温试验
To be no interference in operation after Low temperature test -25±3℃ for 48 hours, the sensitivity to be within ±3dB from initial sensitivity，the meas-urement should be done after 3 hours at the room temperature.
将没有操作干扰过的咪头在-25±3℃的低温环境下放置48小时，试验后在常温下放置3小时后测试，灵敏度变化在±3dB内 。
(6) Temperature Cycle Test温度循环试验
To be no interference in operation after expos
