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如何觀看工控主板的做工質量?
2017-07-26 06:57:11 新聞來源:草莓視頻下載污:深圳市澤創偉業科技有限公司
如(ru)何(he)觀看工(gong)控(kong)主板的做工(gong)質(zhi)量?下面一起來學習(xi)下吧。
一、布線設計
工(gong)控(kong)(kong)主(zhu)板(ban)(ban)上(shang)(shang)的(de)(de)(de)(de)(de)布(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)設(she)計(ji)是(shi)(shi)一門比(bi)較(jiao)專業(ye)的(de)(de)(de)(de)(de)學問,它要(yao)視不(bu)同的(de)(de)(de)(de)(de)線(xian)(xian)(xian)(xian)(xian)路(lu)特性進(jin)行不(bu)同的(de)(de)(de)(de)(de)設(she)計(ji)處理方(fang)式。工(gong)控(kong)(kong)主(zhu)板(ban)(ban)上(shang)(shang)采用(yong)(yong)的(de)(de)(de)(de)(de)"蛇(she)行布(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)"就(jiu)很有(you)(you)講究(jiu),有(you)(you)些人(ren)認為(wei)蛇(she)行布(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)越多就(jiu)說明有(you)(you)更高的(de)(de)(de)(de)(de)設(she)計(ji)水(shui)平,這(zhe)種(zhong)觀點是(shi)(shi)錯誤的(de)(de)(de)(de)(de)。采用(yong)(yong)蛇(she)行布(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)的(de)(de)(de)(de)(de)原(yuan)(yuan)因(yin)有(you)(you)兩(liang)個:一個是(shi)(shi)為(wei)了保證布(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)線(xian)(xian)(xian)(xian)(xian)路(lu)的(de)(de)(de)(de)(de)等長,因(yin)為(wei)像CPU到(dao)北橋芯片的(de)(de)(de)(de)(de)時(shi)(shi)鐘線(xian)(xian)(xian)(xian)(xian),它不(bu)同于普通電器上(shang)(shang)的(de)(de)(de)(de)(de)線(xian)(xian)(xian)(xian)(xian)路(lu),在(zai)這(zhe)些線(xian)(xian)(xian)(xian)(xian)路(lu)上(shang)(shang)以(yi)100MHz左右的(de)(de)(de)(de)(de)頻率高速運(yun)行的(de)(de)(de)(de)(de)信(xin)號對線(xian)(xian)(xian)(xian)(xian)路(lu)的(de)(de)(de)(de)(de)長度(du)(du)十分的(de)(de)(de)(de)(de)敏感,不(bu)等長的(de)(de)(de)(de)(de)時(shi)(shi)鐘布(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)路(lu)會(hui)(hui)引(yin)起(qi)信(xin)號的(de)(de)(de)(de)(de)不(bu)同步(bu)進(jin)而造成(cheng)(cheng)系統不(bu)穩(wen),這(zhe)樣某些線(xian)(xian)(xian)(xian)(xian)路(lu)需(xu)要(yao)以(yi)彎(wan)曲的(de)(de)(de)(de)(de)方(fang)式走(zou)線(xian)(xian)(xian)(xian)(xian),以(yi)調(diao)節長度(du)(du);另一個使用(yong)(yong)蛇(she)行布(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)的(de)(de)(de)(de)(de)常(chang)見原(yuan)(yuan)因(yin)是(shi)(shi)為(wei)了盡可(ke)(ke)能減(jian)少電磁輻(fu)射(she)(EMI)對主(zhu)板(ban)(ban)其余部件(jian)和人(ren)體(ti)的(de)(de)(de)(de)(de)影響(xiang),因(yin)為(wei)高速而單調(diao)的(de)(de)(de)(de)(de)數字信(xin)號會(hui)(hui)大大地干擾主(zhu)板(ban)(ban)上(shang)(shang)模擬器件(jian)的(de)(de)(de)(de)(de)工(gong)作,如AC''97芯片或板(ban)(ban)載的(de)(de)(de)(de)(de)軟貓等。平常(chang)抑(yi)制(zhi)EMI的(de)(de)(de)(de)(de)一種(zhong)簡便方(fang)法(fa)就(jiu)是(shi)(shi)通過設(she)計(ji)蛇(she)形布(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian),來(lai)盡可(ke)(ke)能多吸收消化輻(fu)射(she)。采用(yong)(yong)蛇(she)行布(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)有(you)(you)了上(shang)(shang)面這(zhe)些好(hao)處,并不(bu)是(shi)(shi)說在(zai)工(gong)控(kong)(kong)主(zhu)板(ban)(ban)布(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)設(she)計(ji)的(de)(de)(de)(de)(de)時(shi)(shi)候使用(yong)(yong)蛇(she)行布(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)越多越好(hao),因(yin)為(wei)過多過密的(de)(de)(de)(de)(de)主(zhu)板(ban)(ban)布(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)會(hui)(hui)造成(cheng)(cheng)工(gong)控(kong)(kong)主(zhu)板(ban)(ban)布(bu)(bu)(bu)局的(de)(de)(de)(de)(de)疏密不(bu)均,會(hui)(hui)對工(gong)控(kong)(kong)主(zhu)板(ban)(ban)的(de)(de)(de)(de)(de)質量有(you)(you)一定的(de)(de)(de)(de)(de)影響(xiang)。好(hao)的(de)(de)(de)(de)(de)布(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)應使工(gong)控(kong)(kong)主(zhu)板(ban)(ban)上(shang)(shang)各部分線(xian)(xian)(xian)(xian)(xian)路(lu)密度(du)(du)差別不(bu)大,并且要(yao)盡可(ke)(ke)能均勻分布(bu)(bu)(bu)否則很容(rong)易造成(cheng)(cheng)工(gong)控(kong)(kong)主(zhu)板(ban)(ban)的(de)(de)(de)(de)(de)不(bu)穩(wen)定。
二、做工用料
1、PCB(印刷(shua)電路板)的做工
質(zhi)(zhi)(zhi)量(liang)有保證的(de)PC板色彩基本保持一(yi)致,光潔度(du)好(hao),看起來油光發亮的(de)一(yi)般質(zhi)(zhi)(zhi)量(liang)就比(bi)較好(hao)。PCB板層數一(yi)般的(de)標準是4、6層板,當然6層板質(zhi)(zhi)(zhi)量(liang)要好(hao)很(hen)多(duo)。
2、SMT(表面貼裝)元器件的做工
主(zhu)要通過觀察某(mou)些元器件(jian)貼(tie)裝精度來(lai)判定主(zhu)板的生產工藝(yi)是(shi)否精良,標準(zhun)的元器件(jian)貼(tie)裝定位準(zhun)確,沒有偏移。
3、工控主板用料
名牌大廠(chang)(chang)所生產的工控主板用料,像CPU插座、擴展槽(cao)和插槽(cao)等都采(cai)用名廠(chang)(chang)的插接(jie)界面元器件,主板的性能也(ye)就不用多說(shuo)了。