全(quan)自動界(jie)面張力儀原理是將(jiang)高頻感應(ying)微小位(wei)移(yi)自動(dong)(dong)平(ping)(ping)衡(heng)(heng)測(ce)量系統(tong)應(ying)用到(dao)扭力天(tian)平(ping)(ping)中(zhong)(zhong)去，即作用到(dao)鉑環(huan)上的(de)(de)力發(fa)(fa)生改變(bian)時，與鉑環(huan)所連接的(de)(de)平(ping)(ping)衡(heng)(heng)桿在(zai)兩(liang)個渦流探(tan)頭中(zhong)(zhong)產(chan)生位(wei)移(yi)，使兩(liang)個渦流探(tan)頭中(zhong)(zhong)產(chan)生的(de)(de)電(dian)感量發(fa)(fa)生變(bian)化(hua)，由此引起差動(dong)(dong)變(bian)壓器(qi)失(shi)去平(ping)(ping)衡(heng)(heng)，隨之電(dian)路(lu)中(zhong)(zhong)差動(dong)(dong)放大(da)(da)器(qi)的(de)(de)輸(shu)入(ru)信號(hao)(hao)也失(shi)去平(ping)(ping)衡(heng)(heng)，經放大(da)(da)器(qi)放大(da)(da)輸(shu)出隨鉑環(huan)受(shou)力變(bian)化(hua)而變(bian)化(hua)的(de)(de)電(dian)信號(hao)(hao)，此信號(hao)(hao)送到(dao)微處(chu)理機(ji)中(zhong)(zhong)進(jin)行處(chu)理，并(bing)按自動(dong)(dong)計(ji)算出被測(ce)試樣的(de)(de)實(shi)際張力。