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一、样品描述 所送样品型号为AM528B的PCBA2块(客户标注REV:D),编号为D1～D2;客户标注为REV:B的同型号的PCB1块,编号为B1;客户标注为REV:E的同型号PCB4块,编号为E1～E4。委托单位要求分析PCBA上氧化黑点形成的原因。
First, the sample description sent to the sample model AM528B PCBA2 block (customer tag REV: D), numbered D1 ~ D2; customer label REV: B of the same type of PCB1 block number B1; customer tag REV: E The same type of PCB4 block, numbered E1 ~ E4. The client asked to analyze the formation of oxidation black spots on PCBA.