portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">冷熱沖擊測試是用來評估產(chǎn)品對工作環(huán)境溫度驟然變化的適應能力，是產(chǎn)品設計成型的考核實驗和批產(chǎn)階段的例行實驗中不可或缺的實驗,，在一些情況下還可以用于環(huán)境應力篩選實驗,。冷熱沖擊測試在品質(zhì)考核檢測方面的應用頻率僅次于振動試驗和高低溫試驗。

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">冷熱沖擊測試目的：portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">測試產(chǎn)品在高溫和低溫快速變化條件下工作和存儲的情況,。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">冷熱沖擊測試原理：portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">環(huán)境溫度驟然變化時,，由于熱脹冷縮效應引起交變應力，導致材料開裂,、接觸不良,、性能變化等狀況。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">冷熱沖擊測試的方法：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.實驗前對受試產(chǎn)品做好機械性能(外觀和內(nèi)部結構)和電氣性能檢查,，確保產(chǎn)品機械性能和電氣性能正常。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.將產(chǎn)品合理的布置于冷熱沖擊箱中,，產(chǎn)品和環(huán)境溫度箱四壁間應留有足夠大的空間,，以便于空氣流通。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.按標準規(guī)范選擇冷熱沖擊測試條件,。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.選定冷熱沖擊測試從高溫開始,，按啟動鍵啟動冷熱沖擊測試。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.實驗做好設定的循環(huán)次數(shù)后自動停止。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.實驗結束后將產(chǎn)品從冷熱沖擊箱中取出,，在常溫下恢復直到產(chǎn)品環(huán)境溫度穩(wěn)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.觀察實驗后的產(chǎn)品有無機械損傷(如表面翹曲、破裂,、元器件松動,、脫落等)并檢查電氣性能有無異常。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.如果產(chǎn)品發(fā)生上述的機械損傷或電氣性能指標不符合相關規(guī)范,，即認為產(chǎn)品也損壞,，完整填寫實驗記錄表。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.對實驗暴露的薄弱點做好分析,，提出整改措施,。