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id="nr_main_box"> <div class="86i4nahi9" id="pro_detail_box01"> <div class="86i4nahi9" id="pro_detail_text"> <h1>QJ44直流雙臂電橋</h1> <div id="86i4nahi9" class="pro_ms"> <div id="86i4nahi9" class="bt">簡(jiǎn)要描述：</div> <p>QJ44直流雙臂電橋簡(jiǎn)要說(shuō)明：測(cè)量范圍： 0.1mΩ～11Ω 準(zhǔn)確度： 0.2%</p> </div> <p><strong>型號(hào)：</strong></p> <p><strong>瀏覽量：</strong>1337</p> <p><strong>更新時(shí)間：</strong>2024-07-03</p> <p><strong>價(jià)格：</strong><a href="#order"><img src=/images/cankaojia.gif border=0></a></p> <a href="#tagContent1" class="gwc_an2 lightbox" style=" float:left;" rel="group1">在線留言</a> </div> <div class="86i4nahi9" id="preview"> <div id="86i4nahi9" class="jqzoom"><a target="_blank"><img id="bigImg" src="http://img74.chem17.com/gxhpic_3cd5e59743/8975028d8e14767f762ff845492c9e171b14d37d44da3e0ac5cd38903de5bc48b3372aae3faa5424_320_320_5.jpg" onload="AutoResizeImage(320,320,this)" jqimg="http://img74.chem17.com/8975028d8e14767f762ff845492c9e171b14d37d44da3e0ac5cd38903de5bc48b3372aae3faa5424.jpg" alt="QJ44直流雙臂電橋"></a></div> </div> </div>  <div class="86i4nahi9" id="ny_pro_box02"> <div class="86i4nahi9" id="con"> <ul id="tags"> <li id="86i4nahi9" class="selectTag"><a onmouseover="selectTag('tagContent0',this)" href="javascript:void(0)" onfocus="this.blur()">詳細(xì)介紹</a></li> </ul> <div class="86i4nahi9" id="tagContent"> <div id="86i4nahi9" class="tagContent selectTag" id="tagContent0" style="display: block;"><link type="text/css" rel="stylesheet" href="/css/property.css"> <script> window.onload=function(){ changeTableHeight(); } window.onresize=function(){ changeTableHeight(); } function changeTableHeight(){ $(".proshowParameter table th").each(function?(i,o){ ????var $this=$(o),? ????height=$this.next().height(); ????$(this).css("height",height); var obj = $(o); var val = obj.text(); if(val == '' || val == null || val == undefined){ $(this).addClass('none'); }else{ $(this).removeClass('none'); } }); $(".proshowParameter table td").each(function?(i,o){ var obj = $(o); var val = obj.text(); if(val == '' || val == null || val == undefined){ $(this).addClass('none'); }else{ $(this).removeClass('none'); } }); } </script> <section class="proshowParameter"> <table style=" margin-bottom:20px;"> <tbody> <tr><th>品牌</th><td>其他品牌</td><th>應(yīng)用領(lǐng)域</th><td>石油,能源,電子,交通</td></tr> </tbody> </table> </section><p><strong>QJ44直流雙臂電橋</strong> 的詳細(xì)介紹</p><p><strong>QJ44直流雙臂電橋</strong></p><p>1工作原理</p><p>編輯</p><p>直流雙臂電橋的原理接線如圖：其中Rx為被測(cè)量電阻，Rn是標(biāo)準(zhǔn)電阻，它們一般在1歐以下。ra、rb、rc、rd是接線附加電阻，數(shù)值是隨機(jī)的，一般說(shuō)在0.1歐左右。R1、R2和R3、R4分別構(gòu)成雙臂電橋的兩個(gè)橋臂，它們的阻值在幾百歐以上，所以它們接線的附加電阻可以忽略，圖中為了簡(jiǎn)化也沒(méi)有示出。雙臂電橋平衡時(shí)，B、C兩點(diǎn)的點(diǎn)位相等，流過(guò)檢流計(jì)G的電流為零。電橋的電源E，通過(guò)一個(gè)可調(diào)電阻R,以便逐步增加電橋的靈敏度。</p><h2><em>2</em>使用和維護(hù)</h2><p>編輯</p><p>直流雙臂電橋的型號(hào)很多，其操作方法與直流單臂電橋基本相同。下面以QJ44型直流雙臂電橋?yàn)槔?，說(shuō)明其測(cè)量電阻的步驟。</p><p>步驟1：檢查靈敏度旋鈕置小位置，打開(kāi)檢流計(jì)機(jī)械鎖扣，調(diào)節(jié)調(diào)零器使指針指在零位。</p><p>提示：1 發(fā)現(xiàn)電橋電池電壓不足應(yīng)及時(shí)更換，否則將影響電橋的靈敏度。</p><p>2 采用外接電源時(shí)，必須注意電源的極性。將電源的正、負(fù)極分別接到“+”“－”端鈕，且不要使外接電源電壓超過(guò)電橋工作電壓的規(guī)定值。</p><p>步驟2：估測(cè)被測(cè)電阻，選擇倍率臂</p><p>用萬(wàn)用表估測(cè)被測(cè)電阻，選擇適當(dāng)?shù)谋堵时?。估測(cè)被測(cè)電阻為幾歐時(shí)，倍率臂應(yīng)選×100檔。估測(cè)被測(cè)電阻為零點(diǎn)幾歐時(shí)，倍率臂應(yīng)選×10檔。估測(cè)被測(cè)電阻為零點(diǎn)零幾歐時(shí)，倍率臂應(yīng)選×1檔。</p><p>提示：測(cè)量時(shí)，倍率臂務(wù)必選正確，否則會(huì)產(chǎn)生很大的測(cè)量誤差，從而失去精確測(cè)量的目的。</p><p>步驟3：接入被測(cè)電阻。</p><p>按四端接線法接入被測(cè)電阻時(shí)，應(yīng)采用較短較粗的導(dǎo)線連接，接線間不得絞合，并將接頭擰緊</p><p>提示：1、被測(cè)電阻有電流端鈕和電位端鈕時(shí)，要與電橋上相應(yīng)的端鈕相連接。同時(shí)要注意電位端鈕總是在電流端鈕的內(nèi)側(cè)，且兩電位端鈕之間的電阻就是被測(cè)電阻。</p><p>2、如果被測(cè)電阻（如一根導(dǎo)線）沒(méi)有電流端鈕和電位端鈕，則按下圖所示自行引出電流端鈕和電位端鈕，然后與電橋上相應(yīng)的端鈕相連接。</p><p>步驟4：接通電路，調(diào)節(jié)讀數(shù)盤使之平衡。</p><p>適當(dāng)增加靈敏度，然后觀察檢流計(jì)指針偏轉(zhuǎn)。若檢流計(jì)指針朝“+”方向偏轉(zhuǎn)，應(yīng)減小讀數(shù)盤讀數(shù)；若檢流計(jì)指針朝“－”方向偏轉(zhuǎn)，應(yīng)增大讀數(shù)盤讀數(shù)，使檢流計(jì)指針指零。再增加靈敏度，調(diào)讀數(shù)盤讀數(shù)，使檢流計(jì)指針指零。如此反復(fù)調(diào)節(jié)，直至檢流計(jì)指針指零。</p><p>提示：1、由于直流雙臂電橋在工作時(shí)電流較大，要求上述操作動(dòng)作要迅速，以免電池耗電量過(guò)大。</p><p>2、被測(cè)電阻含有電感時(shí)，應(yīng)先鎖住電源端鈕B，間歇按檢流計(jì)按鈕G。</p><p>3、被測(cè)電阻不含電感時(shí)，應(yīng)先鎖住檢流計(jì)按鈕G，間歇按電源端鈕B。</p><p>步驟5：計(jì)算電阻值。</p><p>被測(cè)電阻值=倍率數(shù)×讀數(shù)盤讀數(shù)</p><p>步驟6：關(guān)閉電源。</p><p>先斷開(kāi)檢流計(jì)按鈕G，再斷開(kāi)電源端鈕B，然后拆除被測(cè)電阻，后鎖上檢流計(jì)鎖扣。</p><p>步驟7：電橋保養(yǎng)。</p><p>每次測(cè)量結(jié)束，都應(yīng)將盒蓋蓋好，存放于干燥、避光、無(wú)振動(dòng)的場(chǎng)合。</p><p>提示：搬動(dòng)電橋時(shí)應(yīng)小心，做到輕拿輕放，否則易使檢流計(jì)損壞。</p></div> 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