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class="input"> <input name="keyword" onblur="if(this.value=='')this.value='請輸入您要查詢的產(chǎn)品'" onfocus="this.value=''" value="請輸入您要查詢的產(chǎn)品" type="text" class="search-txt"> <input name="" type="submit" class="search-btn" value=""> </form> </div> <div id="iqaqewgi6e" class="clear"></div> </div> </div> <div id="iqaqewgi6e" class="nybanner"><img src="/skins/106676/images/nybanner.jpg"></div> <script src="http://www.chem17.com/mystat.aspx?u=mbdzkj"></script>  <div id="iqaqewgi6e" class="ncontent w_1100"> <div id="iqaqewgi6e" class="h-6">技術(shù)文章<span>您當(dāng)前的位置：<a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > 直流雙臂電橋的工作原理</span></div>  <div id="iqaqewgi6e" class="n-3 c-news"> <div id="iqaqewgi6e" class="newsnr"> <h1>直流雙臂電橋的工作原理</h1> <p class="source"><span>日期：2022-05-06</span><span>瀏覽：1915次</span></p> <div> <p><strong>直流雙臂電橋的工作原理</strong><br/></p><p><br/></p><div id="iqaqewgi6e" class="tech-detail-desc" style="border-bottom: 1px dashed rgb(221, 221, 221); line-height: 24px; color: rgb(102, 102, 102); overflow: hidden; word-wrap: break-word; font-family: "Microsoft YaHei", u5FAEu8F6Fu96C5u9ED1, 宋體, "Helvetica Neue", Helvetica, STHeiti, tahoma, arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; text-indent: 2em;"><a target="_blank"><strong>直流雙臂電橋</strong></a>又叫凱爾文電橋，其工作原理電路如圖1所示，圖中Rx是被測電阻，Rn是比較用的可調(diào)電阻。Rx和Rn各有兩對端鈕，C1和C2、Cn1和On2是它們的電流端鈕，P1和P2、Pn1和Pn2是它們的電位端鈕。接線時(shí)必須使被測電阻Rx只在電位端鈕P1和P2之間，而電流端鈕在電位端鈕的外側(cè)，否則就不能排除和減少接線電阻與接觸電阻對測量結(jié)果的影響。比較用可調(diào)電阻的電流端鈕Cn2與被測電阻的電流端鈕C2</p></div><div id="iqaqewgi6e" class="tech-detail-main" style="padding: 0px 20px 20px; font-size: 15px; color: rgb(102, 102, 102); line-height: 26px; text-indent: 2em; overflow: hidden; white-space: normal; background-color: rgb(255, 255, 255); font-family: "Microsoft YaHei" !important;"><p style="margin-top: 6px; margin-bottom: 6px; padding: 0px; line-height: 26px !important; clear: none !important;"><a target="_blank"><strong>直流雙臂電橋</strong></a>又叫凱爾文電橋，其工作原理電路如圖1所示，圖中Rx是被測電阻，Rn是比較用的可調(diào)電阻。Rx和Rn各有兩對端鈕，C1和C2、Cn1和On2是它們的電流端鈕，P1和P2、Pn1和Pn2是它們的電位端鈕。接線時(shí)必須使被測電阻Rx只在電位端鈕P1和P2之間，而電流端鈕在電位端鈕的外側(cè)，否則就不能排除和減少接線電阻與接觸電阻對測量結(jié)果的影響。比較用可調(diào)電阻的電流端鈕Cn2與被測電阻的電流端鈕C2用電阻為r的粗導(dǎo)線連接起來。R1、R1"、R2和R2"是橋臂電阻，其阻值均在lOΩ以上。在結(jié)構(gòu)上把R1和R"1以及R2和R2"做成同軸調(diào)節(jié)電阻，以便改變R1或R2"的同時(shí)，R1"和R2"也會(huì)隨之變化，并能始終保持</p><p style="margin-top: 6px; margin-bottom: 6px; padding: 0px; line-height: 26px !important; clear: none !important;"><img src="https://img64.chem17.com/9/20220506/637874179859840796306.gif" style="border: 0px; max-width: 830px; margin: 4px 0px;"/></p><p style="margin-top: 6px; margin-bottom: 6px; padding: 0px; line-height: 26px !important; clear: none !important;">測量時(shí)接上RX調(diào)節(jié)各橋臂電阻使電橋平衡。此時(shí)，因?yàn)镮g＝0，可得到被測電阻Rx為</p><p style="margin-top: 6px; margin-bottom: 6px; padding: 0px; line-height: 26px !important; clear: none !important;"><img src="https://img64.chem17.com/9/20220506/637874179860776808141.gif" style="border: 0px; max-width: 830px; margin: 4px 0px;"/></p><p style="text-align:center"><img src="https://img63.chem17.com/9/20220506/637874181044777276823.jpg" style="border: 0px; max-width: 830px; margin: 4px 0px; width: 500px; height: 333px;" width="500" height="333" border="0" vspace="0" title="2345_image_file_copy_2.jpg" alt="2345_image_file_copy_2.jpg"/></p><p style="margin-top: 6px; margin-bottom: 6px; padding: 0px; line-height: 26px !important; clear: none !important;">圖1 直流雙臂電橋工作原理電路</p><p style="margin-top: 6px; margin-bottom: 6px; padding: 0px; line-height: 26px !important; clear: none !important;">可見，被測電阻Rx僅決定于橋臂電阻Rz和R1的比值及比較用可調(diào)電阻Rn而與粗導(dǎo)線電阻r無關(guān)。比值R2/R1稱為直流雙臂電橋的倍率。所以電橋平衡時(shí)</p><p style="margin-top: 6px; margin-bottom: 6px; padding: 0px; line-height: 26px !important; clear: none !important;">被測電阻值=倍率讀數(shù)×比較用可調(diào)電阻讀數(shù)</p><p style="margin-top: 6px; margin-bottom: 6px; padding: 0px; line-height: 26px !important; clear: none !important;">因此，為了保證測量的準(zhǔn)確性，連接Rx和Rn電流端鈕的導(dǎo)線應(yīng)盡量選用導(dǎo)電性能良好且短而粗的導(dǎo)線。</p><p style="margin-top: 6px; margin-bottom: 6px; padding: 0px; line-height: 26px !important; clear: none !important;">只要能保證<img height="63" src="https://img70.chem17.com/9/20220506/637874179863825849287.gif" width="98" style="border: 0px; max-width: 830px; margin: 4px 0px;"/>，R1、R1"、R2和R2"均大于1OΩ，r又很小，且接線正確，直流雙臂電橋就可較好地消除或減小接線電阻與接觸電阻的影響。因此，用<a target="_blank">直流雙臂電橋</a>測量小電阻時(shí)，能得到較準(zhǔn)<span style="color: rgb(102, 102, 102); font-family: "Microsoft YaHei"; font-size: 15px; text-indent: 30px; background-color: rgb(255, 255, 255);">確的測量結(jié)果。</span></p></div><p><br/></p> <div id="iqaqewgi6e" class="clear"></div> </div> <div id="iqaqewgi6e" class="article"> <p>上一篇：<a href="/Article-3000259.html">QJ57直流雙臂電橋操作使用說明</a></p> <p>下一篇：<a href="/Article-3000257.html">QJ44直流雙臂電橋使用方法</a></p> </div> <div id="iqaqewgi6e" class="clear"></div> </div> </div> <div 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href="/SonList-1324455.html">> 充電式液壓電纜鉗</a></li> <li><a href="/SonList-1324454.html">> 剝線鉗</a></li> <li><a href="/SonList-1324453.html">> 線纜剪</a></li> <li><a href="/SonList-1324452.html">> 液壓導(dǎo)線鉗</a></li> <li><a href="/SonList-1324451.html">> 壓接鉗</a></li> <li><a href="/SonList-1324450.html">> 液壓鉗</a></li> </ul> </div> </li> <li><a href="/ParentList-1324332.html" onmouseover="showsubmenu('繞組匝間沖擊耐電壓試驗(yàn)儀')" class="yj">繞組匝間沖擊耐電壓試驗(yàn)儀</a> <div class="iqaqewgi6e" id="submenu_繞組匝間沖擊耐電壓試驗(yàn)儀" style="display:none"> <ul> <li><a href="/SonList-1324343.html">> 耐電壓試驗(yàn)儀</a></li> </ul> </div> </li> <li><a href="/ParentList-1324322.html" onmouseover="showsubmenu('直流高壓發(fā)生器')" class="yj">直流高壓發(fā)生器</a> <div class="iqaqewgi6e" id="submenu_直流高壓發(fā)生器" style="display:none"> <ul> <li><a href="/SonList-1324326.html">> 直流高壓發(fā)生器</a></li> <li><a href="/SonList-1324324.html">> ZGF直流高壓發(fā)生器</a></li> </ul> </div> </li> <li><a href="/ParentList-1324311.html" onmouseover="showsubmenu('電工電修工具設(shè)備總匯')" class="yj">電工電修工具設(shè)備總匯</a> <div class="iqaqewgi6e" id="submenu_電工電修工具設(shè)備總匯" style="display:none"> <ul> <li><a href="/SonList-1324320.html">> 電動(dòng)切紙機(jī)</a></li> <li><a href="/SonList-1324319.html">> 電工絕緣材料</a></li> <li><a href="/SonList-1324318.html">> 電機(jī)槽楔</a></li> <li><a href="/SonList-1324316.html">> 橡膠錘、電工鑿</a></li> <li><a href="/SonList-1324314.html">> 不銹鋼通條、通刷</a></li> <li><a href="/SonList-1324313.html">> 不銹鋼劃線板</a></li> <li><a href="/SonList-1324312.html">> 不銹鋼壓線板</a></li> </ul> </div> </li> <li><a href="/ParentList-1324298.html" onmouseover="showsubmenu('漆包線電動(dòng)刮漆器總匯')" class="yj">漆包線電動(dòng)刮漆器總匯</a> <div class="iqaqewgi6e" id="submenu_漆包線電動(dòng)刮漆器總匯" style="display:none"> <ul> <li><a href="/SonList-1324300.html">> 漆包線電動(dòng)刮漆器</a></li> </ul> </div> </li> <li><a href="/ParentList-1324280.html" onmouseover="showsubmenu('電機(jī)萬用繞線?？倕R')" class="yj">電機(jī)萬用繞線?？倕R</a> <div class="iqaqewgi6e" 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style="display:none"> <ul> <li><a href="/SonList-1323611.html">> 吊機(jī)、吊裝帶</a></li> <li><a href="/SonList-1323609.html">> 手動(dòng)、電動(dòng)葫蘆</a></li> <li><a href="/SonList-1323608.html">> 液壓平臺(tái)車</a></li> <li><a href="/SonList-1323607.html">> 液壓升降臺(tái)</a></li> <li><a href="/SonList-1323606.html">> 液壓叉車、電動(dòng)叉車</a></li> <li><a href="/SonList-1323604.html">> 液壓搬運(yùn)車、電動(dòng)搬運(yùn)車</a></li> </ul> </div> </li> <li><a href="/ParentList-1323475.html" onmouseover="showsubmenu('焊割設(shè)備、坡口機(jī)總匯')" class="yj">焊割設(shè)備、坡口機(jī)總匯</a> <div class="iqaqewgi6e" id="submenu_焊割設(shè)備、坡口機(jī)總匯" style="display:none"> <ul> <li><a href="/SonList-1323542.html">> 交直流氬弧焊機(jī)</a></li> <li><a href="/SonList-1323497.html">> 氣割機(jī)</a></li> <li><a href="/SonList-1323495.html">> 坡口機(jī)</a></li> <li><a href="/SonList-1323494.html">> 焊條焊箱、保溫箱</a></li> <li><a href="/SonList-1323493.html">> 螺栓焊機(jī)</a></li> <li><a href="/SonList-1323491.html">> 點(diǎn)焊機(jī)</a></li> <li><a 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