采(cai)用(yong)拉壓(ya)式(shi)傳感器的電子秤(cheng)，這(zhe)種(zhong)傳感器和(he)普通壓(ya)力(li)傳感器相比準確度(du)高(gao)、價格較便(bian)宜、不易損壞，因此應用(yong)前景廣泛。該電子秤(cheng)可(ke)用(yong)于工廠生產中配料和(he)測(ce)力(li)等場合，具有(you)測(ce)量準確，分辨率高(gao)，不易損壞和(he)價格便(bian)宜等優點。  

主(zhu)集成(cheng)城mc14433為(wei)a/d轉換集成(cheng)塊，4511為(wei)led顯示驅動集成(cheng)塊1413為(wei)位選(xuan)片子，1403提(ti)供主(zhu)集成(cheng)電(dian)(dian)路一穩(wen)(wen)定比(bi)較(jiao)電(dian)(dian)壓(ya)，7650為(wei)斬波穩(wen)(wen)零(ling)單(dan)片集成(cheng)運(yun)算放大(da)器(qi)，放大(da)傳(chuan)(chuan)感(gan)器(qi)輸(shu)出的(de)電(dian)(dian)壓(ya)信號。傳(chuan)(chuan)感(gan)器(qi)用blr型(xing)拉壓(ya)式傳(chuan)(chuan)感(gan)器(qi)，ra、rb、rc、rd為(wei)傳(chuan)(chuan)感(gan)器(qi)中應變電(dian)(dian)阻(zu)。穩(wen)(wen)壓(ya)電(dian)(dian)路7805向整個電(dian)(dian)路提(ti)供5v電(dian)(dian)壓(ya)，7805的(de)輸(shu)人電(dian)(dian)壓(ya)在 8－15v時(shi)正(zheng)常工(gong)作(zuo)。也可(ke)用交流(liu)220 v降壓(ya)、整流(liu)、濾波后，提(ti)供給儀器(qi)使用。  

由于(yu)儀(yi)器用(yong)(yong)于(yu)精度較高場(chang)合，因此14433、1403、7650外圍(wei)的(de)(de)阻(zu)容元件(jian)，應選(xuan)用(yong)(yong)低(di)溫度系(xi)數(shu)(shu)、熱(re)穩(wen)定性(xing)好(hao)的(de)(de)，電(dian)(dian)(dian)阻(zu)應選(xuan)用(yong)(yong)rj金屬膜電(dian)(dian)(dian)阻(zu)。7650兩支1k的(de)(de)電(dian)(dian)(dian)阻(zu)差(cha)值(zhi)和re、rf兩電(dian)(dian)(dian)阻(zu)的(de)(de)差(cha)值(zhi)應小(xiao)(xiao)(xiao)(xiao)于(yu) l%，否則秤裝完后有可能調零時(shi)調不到(dao)零點(dian)。re、rf阻(zu)值(zhi)的(de)(de)取(qu)值(zhi)范圍(wei)為(wei)幾十k到(dao)幾百(bai)k之(zhi)間，視所(suo)選(xuan)用(yong)(yong)的(de)(de)傳(chuan)感(gan)器大(da)(da)(da)小(xiao)(xiao)(xiao)(xiao)而定。傳(chuan)感(gan)器量程(cheng)小(xiao)(xiao)(xiao)(xiao)，如(ru)(ru)200kg，阻(zu)值(zhi)就選(xuan)小(xiao)(xiao)(xiao)(xiao)一(yi)些，量程(cheng)大(da)(da)(da)，如(ru)(ru) 2000kg，阻(zu)值(zhi)就選(xuan)大(da)(da)(da)一(yi)些。如(ru)(ru)要用(yong)(yong)小(xiao)(xiao)(xiao)(xiao)數(shu)(shu)點(dian)表示，小(xiao)(xiao)(xiao)(xiao)數(shu)(shu)點(dian)電(dian)(dian)(dian)阻(zu)接(jie)v+，用(yong)(yong)小(xiao)(xiao)(xiao)(xiao)于(yu)200kg量程(cheng)的(de)(de)傳(chuan)感(gan)器時(shi)，接(jie)右邊(bian)數(shu)(shu)第一(yi)位前小(xiao)(xiao)(xiao)(xiao)數(shu)(shu)點(dian)，傳(chuan)感(gan)器量程(cheng)在200ks至2000kg之(zhi)間時(shi)，小(xiao)(xiao)(xiao)(xiao)數(shu)(shu)點(dian)全(quan)不亮，最(zui)小(xiao)(xiao)(xiao)(xiao)分(fen)辨率為(wei)1kg。