比較法測電阻實驗報告實驗人：宋易知 指導老師：曹惠賢實驗日期：2015/4/20一實驗目的1、學習測電阻的一種方法； 2、熟悉不確定度的計算。 二實驗儀器HY1791-3S 型直流穩(wěn)壓電源，1 臺；PZ158B 型直流數(shù)字電壓電流表，1 臺；C65 型電壓表，1 臺；DH6108 型賽電橋實驗儀，1 臺；ZX21 型電阻箱，1 個；350W滑線變阻器，1 個；單刀雙擲開關，3 個；被測電阻，3 個；米尺，1 把；千分尺，1 把。三實驗原理 實驗電路如圖1 所示。四實驗數(shù)據(jù)1.指針式電壓表：電阻1：（RN=800）組號UN（V）Ux(V)Rx()10.6760.829981.120.5360.651971.630.9231.132981.140.8020.982979.650.8601.052978.6平均值978.4電阻2：（RN=90000）組號UN（V）Ux(V)Rx()12345平均值電阻3：（RN=10）組號UN（V）Ux(V)Rx()10.8090.0730.90220.1950.0180.92330.2380.0220.92440.3020.0280.92750.3910.0350.900平均值0.9152.數(shù)字式電壓表電阻1：（RN=800）組號UN（V）Ux(V)Rx()11.0071.249992.321.1731.455992.331.2881.598992.541.3581.684992.051.4221.762991.3平均值992.1電阻2:(RN=90000)組號UN（V）Ux(V)Rx()10.2703.5561.18520.2222.9141.18130.2012.6451.18440.1862.4421.18250.1652.1761.187平均值1.184電阻3：（RN=10)組號UN（V）Ux(V)Rx()10.1450.0130.89720.1680.0150.89330.2040.0190.93140.2430.0220.90550.2930.0270.922平均值0.9103.賽電橋實驗儀電阻1：（RN=1000*(1+-0.02%)）組號UN（V）Ux(V)Rx()11.7801.768993.321.6301.619993.331.5601.550993.641.4901.480993.351.3891.380993.5平均值993.4電阻2：（RN=106*(1+-0.02%)）組號UN（V）Ux(V)Rx()10.4910.5831.18720.5110.6061.18630.5320.6321.18840.5510.6541.18750.6060.7201.188平均值1.187電阻3：（RN=1*(1+-0.05%)）組號UN（V）Ux(V)Rx()10.2230.2220.99620.2320.2300.99130.2380.2360.99240.2460.2450.99650.2510.2490.992平均值0.993金屬桿直徑：次數(shù)12345D(mm)3.9853.9883.9833.9853.985D平均值=3.985（mm）L=15.70(cm)RN=1*(1+-0.05%)組號UN（V）Ux(V)Rx()10.4680.0250.05320.5190.0270.05230.5710.0300.05340.6450.0340.05350.6830.0350.051平均值0.052=R*Sl=R*d24l=0.052*(3.985*10-3)24*15.7*10-24.13*10-6U(R)=UAR2+(UBR20.0001U(s)=UAs2+(UBs20.0054U(l)=