物理实验
物理實驗
물리실험
PHYSICS EXPERIMENTATION
2014年
7期
33-36
,共4页
原媛%沈元华%赵在忠%金浩明%马秀芳%孙燕青%马世红
原媛%瀋元華%趙在忠%金浩明%馬秀芳%孫燕青%馬世紅
원원%침원화%조재충%금호명%마수방%손연청%마세홍
惠斯通电桥%互易桥臂%不确定度评定
惠斯通電橋%互易橋臂%不確定度評定
혜사통전교%호역교비%불학정도평정
Wheatstone bridge%exchanging arm%uncertainty evaluation
在惠斯通电桥实验中,采用互易桥臂法测量电阻,常采用2种传统方法评定不确定度,但结果比标准电阻的标准不确定度还小,其原因是互易桥臂的前后两次测量不是完全独立,它们是同一待测量用同一仪器以不同方法测量的结果。改进的测量方法中,B类不确定度由方和根法计算,B2类不确定度等于标准电阻的不确定度。
在惠斯通電橋實驗中,採用互易橋臂法測量電阻,常採用2種傳統方法評定不確定度,但結果比標準電阻的標準不確定度還小,其原因是互易橋臂的前後兩次測量不是完全獨立,它們是同一待測量用同一儀器以不同方法測量的結果。改進的測量方法中,B類不確定度由方和根法計算,B2類不確定度等于標準電阻的不確定度。
재혜사통전교실험중,채용호역교비법측량전조,상채용2충전통방법평정불학정도,단결과비표준전조적표준불학정도환소,기원인시호역교비적전후량차측량불시완전독립,타문시동일대측량용동일의기이불동방법측량적결과。개진적측량방법중,B류불학정도유방화근법계산,B2류불학정도등우표준전조적불학정도。
In the Wheatstone bridge experiment ,the exchanging bridge arm method was used to measure resistance .Two traditional methods were often used to assess the uncertainty .However ,the results was smaller than the standard uncertainty of the standard resistance ,it was because the last and next measurement by exchanging bridge arm were not fully independent ,the two results were of the same quantity measured by the same instrument in a different way .In the improving measurement method ,class B1 uncertainty could be calculated by the root of square sum ,class B2 uncertainty equals to the uncertainty of standard resistance .