《How to use SMT Line to produce a printed circuit board? (6)》
AOI is the abbreviation of Auto Optical Inspection. It is an optical recognition system for detect the quality of PCB parts after SMT assembly. Also to seeing if the solder paste fit the inspection standard. The biggest advantage of AOI is to replace the SMT’s manual inspection by detecting the assembly mistakes and disadvantages automatically. But the blind spot of AOI is unable to inspect the solder pasting for the bottom of components, and the object under the surface.
The AOI can check out tombstone, missing parts, displacement, polarity, solder bridge, air welding. But it cannot judge false welding, BGA soldering, wrong components, wrong polarity, lead lift, and insufficient solder. In conclusion, AOI can provide immediate feedback for SMT preliminary analysis and improve it yield rate. But it will cause misjudge and false reject easily in object of poor light, poor angle, and dark shadow.
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Hơi bị khó, các mems cố gắng nhé
Question 1: Have you seen today’s paper? It ..… they’ve caught those million – pound bank robbers.
A. writes B. says C. tells D. talks about
Question 2. Could you move your car? You ‘re….. the way of the entrance!
A. on B. in C. at D. to
Question 3: Don’t ….. to any conclusion before you know the full facts.
A. rush B. dive C. leap D. fly
Question 4:Three of the words below go together with “HEAD” to make new words. Which word does NOT?
A. ache B. man C. master D. line
Question 5: What does the following mobile text (cell phone SMS) abbreviation mean: LOL ?
A. I am crying B. Laughing out loud C. I’m going to be late D. I love you lots
Question 6: “That was fantastic! Could I have a second ..… please? ”
A. helping B. course C. plate D. service
Question 7: By then I ….. my driving test. I hope.
A. pass B. will be passed C. will have passed D. have passed
Question 8: ….. … is one of the many factors involved in changing farming methods.
A. Each climate B. A climate C. Climates D. The climate
Question 9: Not only ….. more brittle than hard maples, but they are also less able to withstand high winds.
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Question 10: “Did you know Jim’s getting married next week?” – “ ..… Who to? ”
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Can I use acronyms and abbreviations in the conclusion of a scientific paper or should I avoid them? Even though the main idea of acronyms ... ... <看更多>
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