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LVSE DASHIJIU
2014年
10期
235-236
,共2页
惠斯通电桥%灵敏度%检流计内阻
惠斯通電橋%靈敏度%檢流計內阻
혜사통전교%령민도%검류계내조
Wheatstone bridge%sensitivity%internal resistance of galvanometer
指出了在自搭式惠斯通电桥实验中，检流计内阻是电桥灵敏度一个重要影响因素。首先从理论上推导出了电桥灵敏度与检流计内阻关系式，然后在实验中取检流计内阻不同值进行了分析，结果表明：检流计内阻 Rg远远大于其他桥臂电阻时，电桥灵敏度很低，Rg在0～5000Ω范围中，随着 Rg减小，电桥灵敏度会增加明显。
指齣瞭在自搭式惠斯通電橋實驗中，檢流計內阻是電橋靈敏度一箇重要影響因素。首先從理論上推導齣瞭電橋靈敏度與檢流計內阻關繫式，然後在實驗中取檢流計內阻不同值進行瞭分析，結果錶明：檢流計內阻 Rg遠遠大于其他橋臂電阻時，電橋靈敏度很低，Rg在0～5000Ω範圍中，隨著 Rg減小，電橋靈敏度會增加明顯。
지출료재자탑식혜사통전교실험중，검류계내조시전교령민도일개중요영향인소。수선종이론상추도출료전교령민도여검류계내조관계식，연후재실험중취검류계내조불동치진행료분석，결과표명：검류계내조 Rg원원대우기타교비전조시，전교령민도흔저，Rg재0～5000Ω범위중，수착 Rg감소，전교령민도회증가명현。
In the Wheatstone bridge experiment ,internal resistance of galvanometer is an important factor which affects the sensitivity of bridge . Firstly , the article deduces theoretically the relationship between sensitivity of Wheatstone bridge and internal resistance of galvanometer . Then the article analyzes the relationship by taking different values of internal resistance of galvanometer in the experiment ,and the results show that w hen the internal resistance of galvanometer Rg is much larger than the arm resistance of other bridge ,sensitivity of bridge is very low . If Rg is in the range of 0~5000Ω ,the sensitivity of bridge increases significantly as the Rg decreases .
