采用(yong)(yong)拉壓(ya)式傳(chuan)(chuan)感器(qi)的電子秤，這種(zhong)傳(chuan)(chuan)感器(qi)和普(pu)通壓(ya)力傳(chuan)(chuan)感器(qi)相比準(zhun)確度高、價格較便宜、不易(yi)損壞(huai)，因(yin)此應用(yong)(yong)前景廣泛。該電子秤可用(yong)(yong)于工廠(chang)生(sheng)產中配料和測力等(deng)場合(he)，具有測量準(zhun)確，分辨率高，不易(yi)損壞(huai)和價格便宜等(deng)優點。  

主(zhu)集成(cheng)(cheng)城mc14433為a/d轉換集成(cheng)(cheng)塊(kuai)，4511為led顯示驅(qu)動(dong)集成(cheng)(cheng)塊(kuai)1413為位選(xuan)片(pian)子，1403提供(gong)主(zhu)集成(cheng)(cheng)電(dian)(dian)(dian)路一穩(wen)定比較(jiao)電(dian)(dian)(dian)壓(ya)(ya)(ya)，7650為斬波穩(wen)零單片(pian)集成(cheng)(cheng)運算放大器(qi)，放大傳(chuan)感(gan)器(qi)輸(shu)出的(de)電(dian)(dian)(dian)壓(ya)(ya)(ya)信號。傳(chuan)感(gan)器(qi)用blr型拉(la)壓(ya)(ya)(ya)式傳(chuan)感(gan)器(qi)，ra、rb、rc、rd為傳(chuan)感(gan)器(qi)中應(ying)變電(dian)(dian)(dian)阻。穩(wen)壓(ya)(ya)(ya)電(dian)(dian)(dian)路7805向(xiang)整個電(dian)(dian)(dian)路提供(gong)5v電(dian)(dian)(dian)壓(ya)(ya)(ya)，7805的(de)輸(shu)人電(dian)(dian)(dian)壓(ya)(ya)(ya)在 8－15v時正常(chang)工(gong)作(zuo)。也可用交(jiao)流220 v降(jiang)壓(ya)(ya)(ya)、整流、濾波后，提供(gong)給(gei)儀器(qi)使用。  

由(you)于儀器(qi)用于精度較高(gao)場(chang)合，因此14433、1403、7650外圍的(de)(de)(de)阻(zu)(zu)容元(yuan)件，應選用低溫度系數(shu)(shu)(shu)、熱(re)穩定性好(hao)的(de)(de)(de)，電(dian)阻(zu)(zu)應選用rj金屬膜(mo)電(dian)阻(zu)(zu)。7650兩支1k的(de)(de)(de)電(dian)阻(zu)(zu)差值(zhi)(zhi)和(he)re、rf兩電(dian)阻(zu)(zu)的(de)(de)(de)差值(zhi)(zhi)應小(xiao)(xiao)(xiao)于 l%，否則秤裝完(wan)后有可(ke)能調零時(shi)調不到零點(dian)。re、rf阻(zu)(zu)值(zhi)(zhi)的(de)(de)(de)取值(zhi)(zhi)范圍為(wei)幾十k到幾百k之間(jian)，視所選用的(de)(de)(de)傳(chuan)感(gan)器(qi)大(da)小(xiao)(xiao)(xiao)而(er)定。傳(chuan)感(gan)器(qi)量程(cheng)小(xiao)(xiao)(xiao)，如(ru)200kg，阻(zu)(zu)值(zhi)(zhi)就選小(xiao)(xiao)(xiao)一些(xie)，量程(cheng)大(da)，如(ru) 2000kg，阻(zu)(zu)值(zhi)(zhi)就選大(da)一些(xie)。如(ru)要用小(xiao)(xiao)(xiao)數(shu)(shu)(shu)點(dian)表示，小(xiao)(xiao)(xiao)數(shu)(shu)(shu)點(dian)電(dian)阻(zu)(zu)接v+，用小(xiao)(xiao)(xiao)于200kg量程(cheng)的(de)(de)(de)傳(chuan)感(gan)器(qi)時(shi)，接右邊(bian)數(shu)(shu)(shu)第一位前小(xiao)(xiao)(xiao)數(shu)(shu)(shu)點(dian)，傳(chuan)感(gan)器(qi)量程(cheng)在200ks至(zhi)2000kg之間(jian)時(shi)，小(xiao)(xiao)(xiao)數(shu)(shu)(shu)點(dian)全不亮，最小(xiao)(xiao)(xiao)分辨(bian)率(lv)為(wei)1kg。