portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">冷热冲击测试是用来评估产品对工作环境温度骤然变化的适应能力，是产品设计成型的考核实验和批产阶段的例行实验中不可或缺的实验，在一些情况下还可以用于环境应力筛选实验。冷热冲击测试在品质考核检测方面的应用频率仅次于振动试验和高低温试验。
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">冷热冲击测试目的：portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">测试产品在高温和低温快速变化条件下工作和存储的情况。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">冷热冲击测试原理：portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">环境温度骤然变化时，由于热胀冷缩效应引起交变应力，导致材料开裂、接触不良、性能变化等状况。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">冷热冲击测试的方法：portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">1.实验前对受试产品做好机械性能(外观和内部结构)和电气性能检查，确保产品机械性能和电气性能正常。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">2.将产品合理的布置于冷热冲击箱中，产品和环境温度箱四壁间应留有足够大的空间，以便于空气流通。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">3.按标准规范选择冷热冲击测试条件。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">4.选定冷热冲击测试从高温开始，按启动键启动冷热冲击测试。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">5.实验做好设定的循环次数后自动停止。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">6.实验结束后将产品从冷热冲击箱中取出，在常温下恢复直到产品环境温度稳定。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">7.观察实验后的产品有无机械损伤(如表面翘曲、破裂、元器件松动、脱落等)并检查电气性能有无异常。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">8.如果产品发生上述的机械损伤或电气性能指标不符合相关规范，即认为产品也损坏，完整填写实验记录表。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">
portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">9.对实验暴露的薄弱点做好分析，提出整改措施。