測定銅絲的電阻溫度系數(shù).

1、測定銅絲的電阻溫度系數(shù)實驗儀器與器材加熱、控溫、測溫裝置，漆包線繞制的銅線電阻（R25Q）, 2個滑線電阻（1750 Q、100Q），直流電流表（25100mA、0.5級），2個電阻箱（0.1級、1/4W），燒 杯，導線等。提示與要求1、關于電阻溫度系數(shù)任何物質(zhì)的電阻都與溫度有關，多數(shù)金屬的電阻隨溫度升高而增大，有如下關系：Rt Ro（1Rt），式中Rt,、Ro分別是tC、OC時金屬的電阻值，R是電阻溫度系數(shù)，其單位是C -1。 R一般與溫度有關，但對于實驗用的純銅材料來說，在-50C100C的范圍內(nèi)，R的變化非常小，可當作常數(shù)，即 Rt與t呈線性關系。2、實驗要求（1）實驗前，按實驗目的、實

2、驗室提供的儀器、器材，結合前面的提示，設計出實驗 畫出裝置示意圖，標明各儀器名稱， 設計出測量方法，擬定實驗步驟和數(shù)據(jù)記錄表格。實驗方案經(jīng)教師認可，連線后請老師檢查，無誤后才能進行實驗。注意：水溫不能超過80 C（2）數(shù)據(jù)處理 先用作圖法計算 R 再用最小二乘法進行直線擬合（參閱第四章4），算出R，并求出相關系數(shù)r 要充分考慮儀器的安全，不可因電流過大而燒壞所用儀器。注意：本實驗不要求計算不確定度。在嶼o150C的溫度范圍內(nèi)，洞電阻宵溫度戚瑩性關系，其電阻與溫度關系的表達式為I n = h/R=R.Oa+Qt） 式中，度e時的電阻值；R0為溫彥09時的電阻值；口值為錮的電阻溫度系紀約齒 0.0

3、043n在加熱座椅 后窗熱線等純電阻電路中.尤其寰注意低溫時電阻的下降，從而導致電流過大的影噸.Pt100BA1BA2溫度（C）阻值（Q）溫度（C）阻值（Q）溫度（C）阻值（Q）-20018.49-2007.95-20017.28-19022.80-1909.96-19021.65-18027.08-18011.95-18025.98-17031.32-17013.93-17030.29-16035.53-16015.90-16034.56-15039.71-15017.85-15038.80-14043.87-14019.79-14043.02-13048.00-13021.72-13047

4、.21-12052.11-12023.63-12051.38-11056.19-11025.54-11055.52-10060.25-10027.44-10059.65-9064.30-9029.33-9063.75-8068.33-8031.21-8067.84-7072.33-7033.08-7071.91-6076.33-6034.94-6075.96-5080.31-5036.80-5080.00-4084.27-4038.65-4084.03-3088.22-3040.50-3088.03-2092.16-2042.34-2092.04-1096.09-1044.17-1096.03

5、0100.00046.000100.0010103.901047.8210103.9620107.792049.6420107.9130111.673051.4530111.8540115.544053.2640115.7850119.405055.0650119.7060123.246056.8660123.6070127.077058.6570127.4980130.898060.4380131.3790134.709062.2190135.24100138.5010063.99100139.10110142.2911065.76110142.10120146.0612067.521201

6、46.78130149.8213069.28130150.60140153.5814071.03140154.41150157.3115072.78150158.21160161.0416074.52160162.00170164.7617076.26170165.78180168.4618077.99180169.54190172.1619079.71190173.29200175.8420081.43200177.03210179.5121083.15210180.76220183.1722084.86220184.48230186.3223086.56230188.18240190.45

7、24088.26240191.88250194.0725089.96250195.56260197.6926091.64260199.23270201.2927093.33270202.89280204.8828095.00280206.53290300310320330340350360370380390400410420430440450460470480490500510520530540550560570580590600208.4529096.68290210.17212.0230098.34300213.79215.57310100.01310217.40219.12320101.

8、66320221.00222.65330103.31330224.56226.17340104.96340228.07229.67350107.60350231.60233.17360108.23360235.29236.65370109.86370238.83240.13380111.48380242.36243.59390113.10390245.88247.04400114.72400249.38250.48410116.32410252.88253.90420117.93420256.36257.32430119.52430259.83260.72440121.11440263.292

9、64.11450122.70450266.74267.49460124.28460270.18270.36470125.86470273.43274.22480127.43480277.01277.56490128.99490280.41280.90500130.55500283.80284.22510132.10510287.18287.53520133.65520290.55290.83530135.20530293.91294.11540135.73540297.25297.39550138.27550300.58300.65560139.79560303.90303.91570141.

10、31570307.21307.15580142.83580310.50310.38590144.34590313.79313.59600145.85600317.06發(fā)布者：佛山市普量電子有限公司發(fā)布時間：2010-04-08Cu50型熱電阻分度表Cu50R(0C )=50.000 Q整 10 度電阻值 QC0102030405060708090050.00052.14454.28556.42658.56560.70462.84264.98167.12069.25910071.40073.54275.68677.83379.98282.134Cu100型熱電阻分度表發(fā)布者：佛山市普量電子有限公司發(fā)布時間：2010-04-08Cu10