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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app污下載:深圳市澤創偉業科技有限公司
如何(he)觀看工(gong)控主板的做(zuo)工(gong)質量?下面一(yi)起來學習下吧。
一、布線設計
工(gong)(gong)(gong)(gong)控主(zhu)(zhu)板(ban)(ban)(ban)(ban)上(shang)(shang)(shang)的(de)(de)(de)(de)(de)(de)布(bu)(bu)(bu)(bu)線(xian)(xian)設(she)計是一(yi)門比較專業的(de)(de)(de)(de)(de)(de)學問,它要(yao)視不(bu)(bu)同(tong)的(de)(de)(de)(de)(de)(de)線(xian)(xian)路(lu)特性(xing)進行(xing)不(bu)(bu)同(tong)的(de)(de)(de)(de)(de)(de)設(she)計處(chu)理方式。工(gong)(gong)(gong)(gong)控主(zhu)(zhu)板(ban)(ban)(ban)(ban)上(shang)(shang)(shang)采用的(de)(de)(de)(de)(de)(de)"蛇行(xing)布(bu)(bu)(bu)(bu)線(xian)(xian)"就很有講究,有些人認(ren)為蛇行(xing)布(bu)(bu)(bu)(bu)線(xian)(xian)越多(duo)就說明有更(geng)高的(de)(de)(de)(de)(de)(de)設(she)計水(shui)平,這(zhe)種(zhong)觀點是錯誤的(de)(de)(de)(de)(de)(de)。采用蛇行(xing)布(bu)(bu)(bu)(bu)線(xian)(xian)的(de)(de)(de)(de)(de)(de)原因有兩個:一(yi)個是為了(le)保證布(bu)(bu)(bu)(bu)線(xian)(xian)線(xian)(xian)路(lu)的(de)(de)(de)(de)(de)(de)等(deng)長,因為像CPU到(dao)北橋芯(xin)(xin)片的(de)(de)(de)(de)(de)(de)時(shi)鐘線(xian)(xian),它不(bu)(bu)同(tong)于普通電器上(shang)(shang)(shang)的(de)(de)(de)(de)(de)(de)線(xian)(xian)路(lu),在(zai)這(zhe)些線(xian)(xian)路(lu)上(shang)(shang)(shang)以100MHz左右的(de)(de)(de)(de)(de)(de)頻(pin)率高速運行(xing)的(de)(de)(de)(de)(de)(de)信號對(dui)線(xian)(xian)路(lu)的(de)(de)(de)(de)(de)(de)長度(du)十分(fen)的(de)(de)(de)(de)(de)(de)敏(min)感,不(bu)(bu)等(deng)長的(de)(de)(de)(de)(de)(de)時(shi)鐘布(bu)(bu)(bu)(bu)線(xian)(xian)路(lu)會引起信號的(de)(de)(de)(de)(de)(de)不(bu)(bu)同(tong)步進而造成(cheng)系統不(bu)(bu)穩(wen),這(zhe)樣某些線(xian)(xian)路(lu)需要(yao)以彎曲的(de)(de)(de)(de)(de)(de)方式走(zou)線(xian)(xian),以調節長度(du);另一(yi)個使用蛇行(xing)布(bu)(bu)(bu)(bu)線(xian)(xian)的(de)(de)(de)(de)(de)(de)常(chang)見原因是為了(le)盡(jin)可(ke)能(neng)減少電磁輻(fu)(fu)射(she)(EMI)對(dui)主(zhu)(zhu)板(ban)(ban)(ban)(ban)其余(yu)部件和人體的(de)(de)(de)(de)(de)(de)影(ying)響,因為高速而單調的(de)(de)(de)(de)(de)(de)數字信號會大(da)大(da)地干擾主(zhu)(zhu)板(ban)(ban)(ban)(ban)上(shang)(shang)(shang)模擬(ni)器件的(de)(de)(de)(de)(de)(de)工(gong)(gong)(gong)(gong)作(zuo),如AC''97芯(xin)(xin)片或板(ban)(ban)(ban)(ban)載的(de)(de)(de)(de)(de)(de)軟(ruan)貓(mao)等(deng)。平常(chang)抑制EMI的(de)(de)(de)(de)(de)(de)一(yi)種(zhong)簡便(bian)方法就是通過(guo)設(she)計蛇形布(bu)(bu)(bu)(bu)線(xian)(xian),來盡(jin)可(ke)能(neng)多(duo)吸(xi)收消化輻(fu)(fu)射(she)。采用蛇行(xing)布(bu)(bu)(bu)(bu)線(xian)(xian)有了(le)上(shang)(shang)(shang)面這(zhe)些好(hao)處(chu),并不(bu)(bu)是說在(zai)工(gong)(gong)(gong)(gong)控主(zhu)(zhu)板(ban)(ban)(ban)(ban)布(bu)(bu)(bu)(bu)線(xian)(xian)設(she)計的(de)(de)(de)(de)(de)(de)時(shi)候(hou)使用蛇行(xing)布(bu)(bu)(bu)(bu)線(xian)(xian)越多(duo)越好(hao),因為過(guo)多(duo)過(guo)密(mi)的(de)(de)(de)(de)(de)(de)主(zhu)(zhu)板(ban)(ban)(ban)(ban)布(bu)(bu)(bu)(bu)線(xian)(xian)會造成(cheng)工(gong)(gong)(gong)(gong)控主(zhu)(zhu)板(ban)(ban)(ban)(ban)布(bu)(bu)(bu)(bu)局(ju)的(de)(de)(de)(de)(de)(de)疏密(mi)不(bu)(bu)均,會對(dui)工(gong)(gong)(gong)(gong)控主(zhu)(zhu)板(ban)(ban)(ban)(ban)的(de)(de)(de)(de)(de)(de)質量有一(yi)定的(de)(de)(de)(de)(de)(de)影(ying)響。好(hao)的(de)(de)(de)(de)(de)(de)布(bu)(bu)(bu)(bu)線(xian)(xian)應使工(gong)(gong)(gong)(gong)控主(zhu)(zhu)板(ban)(ban)(ban)(ban)上(shang)(shang)(shang)各部分(fen)線(xian)(xian)路(lu)密(mi)度(du)差別不(bu)(bu)大(da),并且要(yao)盡(jin)可(ke)能(neng)均勻分(fen)布(bu)(bu)(bu)(bu)否(fou)則(ze)很容易造成(cheng)工(gong)(gong)(gong)(gong)控主(zhu)(zhu)板(ban)(ban)(ban)(ban)的(de)(de)(de)(de)(de)(de)不(bu)(bu)穩(wen)定。
二、做工用料
1、PCB(印(yin)刷電路板)的做工
質量(liang)有(you)保證的PC板色彩(cai)基本保持一(yi)致,光潔度好(hao),看起來油光發亮的一(yi)般質量(liang)就比較好(hao)。PCB板層(ceng)數一(yi)般的標準是4、6層(ceng)板,當(dang)然6層(ceng)板質量(liang)要(yao)好(hao)很多。
2、SMT(表面(mian)貼裝)元器件的做(zuo)工
主要(yao)通(tong)過觀察某些元(yuan)(yuan)器(qi)件貼裝精度來判定(ding)主板的生產(chan)工藝是否精良,標(biao)準(zhun)的元(yuan)(yuan)器(qi)件貼裝定(ding)位準(zhun)確,沒有(you)偏移。
3、工(gong)控(kong)主板用(yong)料(liao)
名牌大廠(chang)所生產的(de)(de)工控主板用料,像CPU插(cha)座、擴展槽和插(cha)槽等都采用名廠(chang)的(de)(de)插(cha)接(jie)界(jie)面(mian)元器件,主板的(de)(de)性(xing)能也就不用多(duo)說了。