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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:驚爆草莓污視頻:深圳市澤創偉業科技有限公司
如何(he)觀看工控主板(ban)的做工質量(liang)?下面一起來學習下吧。
一、布線設計(ji)
工(gong)(gong)控(kong)主(zhu)板(ban)上(shang)(shang)的(de)(de)(de)(de)布(bu)線(xian)(xian)(xian)(xian)設(she)計是(shi)(shi)一(yi)(yi)門比較(jiao)專(zhuan)業的(de)(de)(de)(de)學問,它要視(shi)不(bu)(bu)(bu)(bu)同的(de)(de)(de)(de)線(xian)(xian)(xian)(xian)路(lu)特性進行(xing)不(bu)(bu)(bu)(bu)同的(de)(de)(de)(de)設(she)計處理方(fang)式。工(gong)(gong)控(kong)主(zhu)板(ban)上(shang)(shang)采(cai)用的(de)(de)(de)(de)"蛇(she)(she)行(xing)布(bu)線(xian)(xian)(xian)(xian)"就很有(you)(you)(you)(you)講究(jiu),有(you)(you)(you)(you)些(xie)(xie)人認為(wei)(wei)(wei)蛇(she)(she)行(xing)布(bu)線(xian)(xian)(xian)(xian)越多(duo)就說明(ming)有(you)(you)(you)(you)更高(gao)(gao)的(de)(de)(de)(de)設(she)計水平(ping),這(zhe)種觀點是(shi)(shi)錯(cuo)誤的(de)(de)(de)(de)。采(cai)用蛇(she)(she)行(xing)布(bu)線(xian)(xian)(xian)(xian)的(de)(de)(de)(de)原(yuan)因(yin)有(you)(you)(you)(you)兩(liang)個(ge):一(yi)(yi)個(ge)是(shi)(shi)為(wei)(wei)(wei)了保證布(bu)線(xian)(xian)(xian)(xian)線(xian)(xian)(xian)(xian)路(lu)的(de)(de)(de)(de)等(deng)長,因(yin)為(wei)(wei)(wei)像CPU到北橋芯(xin)片的(de)(de)(de)(de)時(shi)鐘線(xian)(xian)(xian)(xian),它不(bu)(bu)(bu)(bu)同于普通電(dian)(dian)器上(shang)(shang)的(de)(de)(de)(de)線(xian)(xian)(xian)(xian)路(lu),在(zai)(zai)這(zhe)些(xie)(xie)線(xian)(xian)(xian)(xian)路(lu)上(shang)(shang)以100MHz左(zuo)右的(de)(de)(de)(de)頻率(lv)高(gao)(gao)速運行(xing)的(de)(de)(de)(de)信(xin)號(hao)(hao)對(dui)線(xian)(xian)(xian)(xian)路(lu)的(de)(de)(de)(de)長度十分的(de)(de)(de)(de)敏感,不(bu)(bu)(bu)(bu)等(deng)長的(de)(de)(de)(de)時(shi)鐘布(bu)線(xian)(xian)(xian)(xian)路(lu)會(hui)引起信(xin)號(hao)(hao)的(de)(de)(de)(de)不(bu)(bu)(bu)(bu)同步進而造(zao)成系統不(bu)(bu)(bu)(bu)穩,這(zhe)樣某些(xie)(xie)線(xian)(xian)(xian)(xian)路(lu)需要以彎曲(qu)的(de)(de)(de)(de)方(fang)式走線(xian)(xian)(xian)(xian),以調(diao)節長度;另一(yi)(yi)個(ge)使(shi)用蛇(she)(she)行(xing)布(bu)線(xian)(xian)(xian)(xian)的(de)(de)(de)(de)常見(jian)原(yuan)因(yin)是(shi)(shi)為(wei)(wei)(wei)了盡(jin)可(ke)能減少電(dian)(dian)磁輻射(EMI)對(dui)主(zhu)板(ban)其余部件(jian)和人體的(de)(de)(de)(de)影(ying)響,因(yin)為(wei)(wei)(wei)高(gao)(gao)速而單調(diao)的(de)(de)(de)(de)數字信(xin)號(hao)(hao)會(hui)大(da)大(da)地(di)干擾主(zhu)板(ban)上(shang)(shang)模擬器件(jian)的(de)(de)(de)(de)工(gong)(gong)作,如AC''97芯(xin)片或板(ban)載的(de)(de)(de)(de)軟貓等(deng)。平(ping)常抑制EMI的(de)(de)(de)(de)一(yi)(yi)種簡便方(fang)法(fa)就是(shi)(shi)通過(guo)設(she)計蛇(she)(she)形布(bu)線(xian)(xian)(xian)(xian),來盡(jin)可(ke)能多(duo)吸收消化輻射。采(cai)用蛇(she)(she)行(xing)布(bu)線(xian)(xian)(xian)(xian)有(you)(you)(you)(you)了上(shang)(shang)面這(zhe)些(xie)(xie)好處,并不(bu)(bu)(bu)(bu)是(shi)(shi)說在(zai)(zai)工(gong)(gong)控(kong)主(zhu)板(ban)布(bu)線(xian)(xian)(xian)(xian)設(she)計的(de)(de)(de)(de)時(shi)候使(shi)用蛇(she)(she)行(xing)布(bu)線(xian)(xian)(xian)(xian)越多(duo)越好,因(yin)為(wei)(wei)(wei)過(guo)多(duo)過(guo)密(mi)(mi)的(de)(de)(de)(de)主(zhu)板(ban)布(bu)線(xian)(xian)(xian)(xian)會(hui)造(zao)成工(gong)(gong)控(kong)主(zhu)板(ban)布(bu)局(ju)的(de)(de)(de)(de)疏(shu)密(mi)(mi)不(bu)(bu)(bu)(bu)均,會(hui)對(dui)工(gong)(gong)控(kong)主(zhu)板(ban)的(de)(de)(de)(de)質量有(you)(you)(you)(you)一(yi)(yi)定的(de)(de)(de)(de)影(ying)響。好的(de)(de)(de)(de)布(bu)線(xian)(xian)(xian)(xian)應使(shi)工(gong)(gong)控(kong)主(zhu)板(ban)上(shang)(shang)各部分線(xian)(xian)(xian)(xian)路(lu)密(mi)(mi)度差別(bie)不(bu)(bu)(bu)(bu)大(da),并且要盡(jin)可(ke)能均勻分布(bu)否則很容易造(zao)成工(gong)(gong)控(kong)主(zhu)板(ban)的(de)(de)(de)(de)不(bu)(bu)(bu)(bu)穩定。
二、做工用(yong)料
1、PCB(印(yin)刷電路板(ban))的做工(gong)
質量有保證的PC板色(se)彩(cai)基本保持一(yi)致,光潔度(du)好(hao),看(kan)起來油光發亮的一(yi)般(ban)質量就比較好(hao)。PCB板層數(shu)一(yi)般(ban)的標準(zhun)是4、6層板,當然6層板質量要(yao)好(hao)很多。
2、SMT(表面(mian)貼裝)元器件的(de)做工
主(zhu)要通過(guo)觀察某(mou)些(xie)元器(qi)件(jian)貼裝精(jing)度(du)來(lai)判(pan)定主(zhu)板的生產工藝是否精(jing)良,標準(zhun)的元器(qi)件(jian)貼裝定位準(zhun)確,沒(mei)有偏移。
3、工控主板用(yong)料
名牌(pai)大廠所生產的(de)工控主板用料,像CPU插(cha)座、擴(kuo)展槽和插(cha)槽等(deng)都采用名廠的(de)插(cha)接界面(mian)元(yuan)器件,主板的(de)性能(neng)也(ye)就不(bu)用多說了(le)。