一般精度測量時用恒流源激勵.恒壓源激勵時，測量的精度取決于恒壓源穩壓器件的精度.另外，又可將壓力傳感器的激勵電(dian)(dian)(dian)(dian)源分為正(zheng)比激勵和(he)固定(ding)(ding)激勵.者是將壓(ya)(ya)(ya)(ya)力(li)傳(chuan)器(qi)(qi)(qi)電(dian)(dian)(dian)(dian)橋直接接到(dao)前電(dian)(dian)(dian)(dian)源上，當電(dian)(dian)(dian)(dian)源改變時，壓(ya)(ya)(ya)(ya)力(li)傳(chuan)感(gan)器(qi)(qi)(qi)的靈敏(min)度和(he)零點都隨之發生變化(hua).后者內(nei)部有一個(ge)參照(zhao)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)，壓(ya)(ya)(ya)(ya)力(li)傳(chuan)感(gan)器(qi)(qi)(qi)電(dian)(dian)(dian)(dian)橋由參照(zhao)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)供電(dian)(dian)(dian)(dian)激勵.參考電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)是恒定(ding)(ding)的，與電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)無關(guan).要電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)在(zai)一指(zhi)定(ding)(ding)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)范(fan)圍(wei)只內(nei)變化(hua)，照(zhao)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)不(bu)(bu)變.而傳(chuan)感(gan)器(qi)(qi)(qi)的輸出(chu)不(bu)(bu)變，參因不(bu)(bu)受電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)的影響。

壓(ya)力(li)傳(chuan)(chuan)感(gan)器可以用(yong)(yong)電(dian)(dian)(dian)池供(gong)電(dian)(dian)(dian)，但(dan)更(geng)普遍(bian)的是采(cai)用(yong)(yong)直(zhi)流穩壓(ya)電(dian)(dian)(dian)源技術.電(dian)(dian)(dian)池供(gong)電(dian)(dian)(dian)時噪聲小，但(dan)隨電(dian)(dian)(dian)池使用(yong)(yong)，電(dian)(dian)(dian)電(dian)(dian)(dian)壓(ya)逐漸降低(di)(di)，供(gong)特別是當傳(chuan)(chuan)感(gan)器用(yong)(yong)正比激(ji)勵(li)時，靈敏(min)度(du)便(bian)逐漸減小.這就會(hui)(hui)造(zao)成讀數不(bu)準(zhun)。因此要采(cai)用(yong)(yong)補償辦法(例如壓(ya)力(li)傳(chuan)(chuan)感(gan)器和(he)AD變換器/共(gong)用(yong)(yong)一(yi)個電(dian)(dian)(dian)池供(gong)電(dian)(dian)(dian))或者(zhe)使用(yong)(yong)低(di)(di)功(gong)耗、電(dian)(dian)(dian)流的壓(ya)，小力(li)傳(chuan)(chuan)感(gan)器，壽(shou)命電(dian)(dian)(dian)池，者(zhe)測量壓(ya)力(li)時接上(shang)(shang)電(dian)(dian)(dian)源，長或測量完畢后(hou)，電(dian)(dian)(dian)池關閉節(jie)省(sheng)電(dian)(dian)(dian)能(neng).上(shang)(shang)新電(dian)(dian)(dian)池后(hou)，將換壓(ya)力(li)傳(chuan)(chuan)感(gan)器需要重新校準(zhun)標定.這是因為不(bu)同牌號的電(dian)(dian)(dian)池其電(dian)(dian)(dian)動勢、內(nei)阻都存在一(yi)定的差異.壓(ya)力(li)傳(chuan)(chuan)感(gan)器的電(dian)(dian)(dian)橋激(ji)勵(li)電(dian)(dian)(dian)壓(ya)的變化會(hui)(hui)造(zao)成靈敏(min)度(du)的改變.

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