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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:草莓視頻污黃:深圳市澤創偉業科技有限公司
如何觀看工控(kong)主板的(de)做工質(zhi)量?下(xia)(xia)面一起(qi)來(lai)學習下(xia)(xia)吧。
一、布線設計
工(gong)控(kong)主(zhu)(zhu)(zhu)(zhu)板上(shang)(shang)(shang)的(de)(de)(de)(de)(de)(de)(de)布(bu)線(xian)(xian)(xian)(xian)(xian)(xian)設(she)(she)計(ji)(ji)是(shi)(shi)一(yi)(yi)門(men)比較專業(ye)的(de)(de)(de)(de)(de)(de)(de)學問,它(ta)要視不(bu)(bu)(bu)同(tong)的(de)(de)(de)(de)(de)(de)(de)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)(lu)(lu)特性進行(xing)(xing)(xing)(xing)不(bu)(bu)(bu)同(tong)的(de)(de)(de)(de)(de)(de)(de)設(she)(she)計(ji)(ji)處理方(fang)式。工(gong)控(kong)主(zhu)(zhu)(zhu)(zhu)板上(shang)(shang)(shang)采(cai)(cai)用(yong)的(de)(de)(de)(de)(de)(de)(de)"蛇(she)行(xing)(xing)(xing)(xing)布(bu)線(xian)(xian)(xian)(xian)(xian)(xian)"就很(hen)有(you)講究(jiu),有(you)些(xie)人(ren)認為(wei)(wei)蛇(she)行(xing)(xing)(xing)(xing)布(bu)線(xian)(xian)(xian)(xian)(xian)(xian)越多(duo)(duo)就說(shuo)(shuo)明有(you)更高(gao)的(de)(de)(de)(de)(de)(de)(de)設(she)(she)計(ji)(ji)水平,這種觀點(dian)是(shi)(shi)錯誤的(de)(de)(de)(de)(de)(de)(de)。采(cai)(cai)用(yong)蛇(she)行(xing)(xing)(xing)(xing)布(bu)線(xian)(xian)(xian)(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)(de)原因(yin)(yin)有(you)兩個(ge):一(yi)(yi)個(ge)是(shi)(shi)為(wei)(wei)了保證布(bu)線(xian)(xian)(xian)(xian)(xian)(xian)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)(lu)(lu)的(de)(de)(de)(de)(de)(de)(de)等長,因(yin)(yin)為(wei)(wei)像CPU到北橋芯(xin)片的(de)(de)(de)(de)(de)(de)(de)時鐘線(xian)(xian)(xian)(xian)(xian)(xian),它(ta)不(bu)(bu)(bu)同(tong)于普通(tong)電器(qi)上(shang)(shang)(shang)的(de)(de)(de)(de)(de)(de)(de)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)(lu)(lu),在這些(xie)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)(lu)(lu)上(shang)(shang)(shang)以(yi)100MHz左右的(de)(de)(de)(de)(de)(de)(de)頻率高(gao)速運行(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)(de)(de)信號對(dui)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)(lu)(lu)的(de)(de)(de)(de)(de)(de)(de)長度(du)十分的(de)(de)(de)(de)(de)(de)(de)敏感,不(bu)(bu)(bu)等長的(de)(de)(de)(de)(de)(de)(de)時鐘布(bu)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)(lu)(lu)會(hui)引起信號的(de)(de)(de)(de)(de)(de)(de)不(bu)(bu)(bu)同(tong)步進而造(zao)(zao)成系統不(bu)(bu)(bu)穩,這樣某些(xie)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)(lu)(lu)需要以(yi)彎曲的(de)(de)(de)(de)(de)(de)(de)方(fang)式走(zou)線(xian)(xian)(xian)(xian)(xian)(xian),以(yi)調(diao)節長度(du);另一(yi)(yi)個(ge)使用(yong)蛇(she)行(xing)(xing)(xing)(xing)布(bu)線(xian)(xian)(xian)(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)(de)常見(jian)原因(yin)(yin)是(shi)(shi)為(wei)(wei)了盡可(ke)(ke)能(neng)(neng)減少電磁輻(fu)射(EMI)對(dui)主(zhu)(zhu)(zhu)(zhu)板其余部(bu)件(jian)和人(ren)體的(de)(de)(de)(de)(de)(de)(de)影響,因(yin)(yin)為(wei)(wei)高(gao)速而單調(diao)的(de)(de)(de)(de)(de)(de)(de)數字信號會(hui)大大地(di)干擾主(zhu)(zhu)(zhu)(zhu)板上(shang)(shang)(shang)模擬器(qi)件(jian)的(de)(de)(de)(de)(de)(de)(de)工(gong)作,如AC''97芯(xin)片或板載的(de)(de)(de)(de)(de)(de)(de)軟(ruan)貓(mao)等。平常抑(yi)制EMI的(de)(de)(de)(de)(de)(de)(de)一(yi)(yi)種簡便方(fang)法(fa)就是(shi)(shi)通(tong)過(guo)設(she)(she)計(ji)(ji)蛇(she)形布(bu)線(xian)(xian)(xian)(xian)(xian)(xian),來盡可(ke)(ke)能(neng)(neng)多(duo)(duo)吸收(shou)消(xiao)化輻(fu)射。采(cai)(cai)用(yong)蛇(she)行(xing)(xing)(xing)(xing)布(bu)線(xian)(xian)(xian)(xian)(xian)(xian)有(you)了上(shang)(shang)(shang)面(mian)這些(xie)好處,并不(bu)(bu)(bu)是(shi)(shi)說(shuo)(shuo)在工(gong)控(kong)主(zhu)(zhu)(zhu)(zhu)板布(bu)線(xian)(xian)(xian)(xian)(xian)(xian)設(she)(she)計(ji)(ji)的(de)(de)(de)(de)(de)(de)(de)時候使用(yong)蛇(she)行(xing)(xing)(xing)(xing)布(bu)線(xian)(xian)(xian)(xian)(xian)(xian)越多(duo)(duo)越好,因(yin)(yin)為(wei)(wei)過(guo)多(duo)(duo)過(guo)密(mi)的(de)(de)(de)(de)(de)(de)(de)主(zhu)(zhu)(zhu)(zhu)板布(bu)線(xian)(xian)(xian)(xian)(xian)(xian)會(hui)造(zao)(zao)成工(gong)控(kong)主(zhu)(zhu)(zhu)(zhu)板布(bu)局的(de)(de)(de)(de)(de)(de)(de)疏密(mi)不(bu)(bu)(bu)均(jun),會(hui)對(dui)工(gong)控(kong)主(zhu)(zhu)(zhu)(zhu)板的(de)(de)(de)(de)(de)(de)(de)質量有(you)一(yi)(yi)定的(de)(de)(de)(de)(de)(de)(de)影響。好的(de)(de)(de)(de)(de)(de)(de)布(bu)線(xian)(xian)(xian)(xian)(xian)(xian)應使工(gong)控(kong)主(zhu)(zhu)(zhu)(zhu)板上(shang)(shang)(shang)各部(bu)分線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)(lu)(lu)密(mi)度(du)差別不(bu)(bu)(bu)大,并且要盡可(ke)(ke)能(neng)(neng)均(jun)勻分布(bu)否則很(hen)容易造(zao)(zao)成工(gong)控(kong)主(zhu)(zhu)(zhu)(zhu)板的(de)(de)(de)(de)(de)(de)(de)不(bu)(bu)(bu)穩定。
二、做工用料
1、PCB(印(yin)刷電路板)的做工
質量(liang)有(you)保證(zheng)的PC板色彩基(ji)本(ben)保持一(yi)致,光潔度好,看起來油光發亮的一(yi)般質量(liang)就比較好。PCB板層數一(yi)般的標準是4、6層板,當然(ran)6層板質量(liang)要(yao)好很多。
2、SMT(表(biao)面貼裝)元器(qi)件的做(zuo)工
主要(yao)通過觀察(cha)某(mou)些元(yuan)器件貼裝精(jing)度來判(pan)定主板的(de)生(sheng)產(chan)工藝是否精(jing)良,標準(zhun)的(de)元(yuan)器件貼裝定位準(zhun)確,沒有偏(pian)移。
3、工控主(zhu)板用料(liao)
名(ming)牌大廠所生產的(de)(de)工(gong)控主(zhu)(zhu)板(ban)用(yong)料,像CPU插座、擴(kuo)展槽(cao)和插槽(cao)等都采用(yong)名(ming)廠的(de)(de)插接界面元器件(jian),主(zhu)(zhu)板(ban)的(de)(de)性能也就不用(yong)多(duo)說了。