《舊文複習》J-STD-020表格中的【Soak Requirement(暴露濕度環境及時間要求)】算是本文的重頭戲,規範零件廠商測試其產品能夠符合何種「濕敏等級(MSL)」的預先暴露環境與時間條件。也就是待測試的樣品必須先置放於表格中所規定的溫度/濕度與一定時間後才能拿去過回焊爐(Reflow),回焊爐的溫度也有規定,請自行參考IPC/JEDEC J-STD-020規範,之後還要經過40倍放大鏡與超聲波掃描儀(SAM,scanning acoustic microscope)檢查有無不正常的裂縫(crack)發生,還要再經過電測以確保所有的樣品沒有功能上的問題才算pass。
scanning acoustic microscope 在 How it works Scanning Acoustic Microscopy (C-SAM) - ALTER ... 的相關結果
The technique makes use of the high penetration depth of acoustic waves, in comparison to light, to image the internal structure of the specimen. Thus, in ... ... <看更多>
scanning acoustic microscope 在 Scanning Acoustic Microscopy - an overview - Science ... 的相關結果
Scanning acoustic microscopy (SAM) is a full-field, nondestructive technique capable of detecting changes in elastic properties of solids. ... <看更多>
scanning acoustic microscope 在 Scanning acoustic microscopy for material evaluation 的相關結果
Scanning acoustic microscopy (SAM) or Acoustic Micro Imaging (AMI) is a powerful, non-destructive technique that can detect hidden defects ... ... <看更多>