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<li><a href="/SonList-538071.html">手持?jǐn)?shù)字選頻電平表</a></li> </ul> </div> </li> <li> <a href="/ParentList-538074.html" onmouseover="showsubmenu('數(shù)字微安表')">數(shù)字微安表</a> <div class="eqckvv83f" id="submenu_數(shù)字微安表" style="display:none"> <ul class="two_profl"> <li><a href="/SonList-538075.html">直流微安表</a></li> </ul> </div> </li> </ul> </div> </div> <div id="eqckvv83f" class="nymiddlezty"> <div id="eqckvv83f" class="mianbao">您現(xiàn)在的位置：<a href="/">首頁(yè)</a> > <a href="/article.html">技術(shù)文章</a> > 直流電阻測(cè)試儀測(cè)試直流電阻的兩種方法</div> <div id="eqckvv83f" class="about_con"> <h1 class="newstit">直流電阻測(cè)試儀測(cè)試直流電阻的兩種方法</h1> <div id="eqckvv83f" class="newstime"> <span id="eqckvv83f" class="skim"><em>瀏覽次數(shù)：</em>539</span><span id="eqckvv83f" class="skimtim"><em>發(fā)布日期：</em>2024-08-29 </span> </div> <p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體; font-size: 13px; text-wrap: wrap; color: rgb(59, 59, 59); background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; font-family: 微軟雅黑; font-size: 16px;"><strong><span style="margin: 0px; padding: 0px; font-family: 宋體, SimSun;">直流電阻測(cè)試儀測(cè)試直流電阻的兩種方法</span></strong></span><span style="margin: 0px; padding: 0px; font-family: 宋體, SimSun; font-size: 16px;"> </span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體; font-size: 13px; text-wrap: wrap; color: rgb(59, 59, 59); background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; font-family: 宋體, SimSun; font-size: 16px;"> 直流電阻測(cè)試是變壓器、電抗器等線圈類設(shè)備既簡(jiǎn)便又重要的一個(gè)試驗(yàn)項(xiàng)目。主要用來(lái)測(cè)量繞組連同套管的直流電阻能夠有效檢測(cè)繞組內(nèi)部導(dǎo)線接頭的焊接質(zhì)量。檢查引線與繞組接頭的焊接質(zhì)量，電壓分接開(kāi)關(guān)各個(gè)分接位置及引線與套管的接觸是否良好，并聯(lián)支路連接是否正確，變壓器載流部分有無(wú)斷路，接觸不良以及層、匝間有無(wú)短路現(xiàn)象。一般采用直流電阻測(cè)試儀進(jìn)行直流電阻的測(cè)試，常規(guī)的測(cè)試方法如下：</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體; font-size: 13px; text-wrap: wrap; color: rgb(59, 59, 59); background-color: rgb(255, 255, 255); text-align: center;"> </p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 微軟雅黑; color: rgb(51, 51, 51); font-size: 13px; text-wrap: wrap; text-align: center;"><img src="https://img48.afzhan.com/9/20240829/638605274777645498406.jpg" title="20A直流電阻測(cè)試儀.jpg" alt="20A直流電阻測(cè)試儀.jpg" width="421" height="421" style="margin: 0px; padding: 0px; border: none; max-width: 800px; max-height: 300%; width: 421px; height: 421px;" /></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體; font-size: 13px; text-wrap: wrap; color: rgb(59, 59, 59); background-color: rgb(255, 255, 255); text-align: center;"> </p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體; font-size: 13px; text-wrap: wrap; color: rgb(59, 59, 59); background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; font-family: 宋體, SimSun; font-size: 16px;"> 1、電橋法，應(yīng)用電橋平衡的原理來(lái)測(cè)量繞組直流電阻的方法稱為電橋法，分為兩種，一是單臂電橋(惠斯登電橋)，二是雙臂電橋(凱爾文電橋)。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體; font-size: 13px; text-wrap: wrap; color: rgb(59, 59, 59); background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; font-family: 宋體, SimSun; font-size: 16px;"> 1)單臂電橋，單臂電橋的測(cè)量原理如圖2-1所示，xR是被測(cè)電阻。當(dāng)Rx上的電壓降等于R3上的電壓降時(shí)，則A、B兩點(diǎn)沒(méi)有電位差，即檢流計(jì)中沒(méi)有電流，此時(shí)1I流經(jīng)xR和2R ，2I 流經(jīng)3R和4R，電橋達(dá)到平衡。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體; font-size: 13px; text-wrap: wrap; color: rgb(59, 59, 59); background-color: rgb(255, 255, 255); text-align: center;"><img src="https://img58.afzhan.com/9/20240829/638605274780685179748.jpg" alt="直流電阻測(cè)試單臂電橋法" width="489" height="393" title="直流電阻測(cè)試單臂電橋法" align="" style="margin: 0px; padding: 0px; border: 0px; vertical-align: top; display: inline-block; outline: none; width: 489px; height: 393px;" /></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體; font-size: 13px; text-wrap: wrap; color: rgb(59, 59, 59); background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; font-family: 宋體, SimSun; font-size: 16px;"> 2)雙臂電橋，雙臂電橋的接線特點(diǎn)是將連接及Rn的試驗(yàn)用電流線和電壓線分開(kāi)，利用電壓線把Rx 及Rn上的壓降引到橋內(nèi)平衡，使通過(guò)電流的引線與接線的接觸電阻上壓降不引入橋內(nèi)，這樣就消除了接觸電阻及引線電阻的影響，適宜測(cè)量準(zhǔn)確度要求高的小電阻。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體; font-size: 13px; text-wrap: wrap; color: rgb(59, 59, 59); background-color: rgb(255, 255, 255); text-align: center;"><img src="https://img49.afzhan.com/9/20240829/638605274783338721554.jpg" alt="直流電阻測(cè)試雙臂電橋法" width="428" height="293" title="直流電阻測(cè)試雙臂電橋法" align="" style="margin: 0px; padding: 0px; border: 0px; vertical-align: top; display: inline-block; outline: none; width: 428px; height: 293px;" /></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體; font-size: 13px; text-wrap: wrap; color: rgb(59, 59, 59); background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; font-family: 宋體, SimSun; font-size: 16px;"> 原理圖如圖2-2所示，圖中P為檢流計(jì)，XR為被測(cè)電阻，R3 、R4 、'R3及'R4為橋臂電阻，NR為標(biāo)準(zhǔn)電阻，C1、C2為被測(cè)電阻的電流接頭，P1 、P2為被測(cè)電阻的電壓接頭。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體; font-size: 13px; text-wrap: wrap; color: rgb(59, 59, 59); background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; font-family: 宋體, SimSun; font-size: 16px;"> 2、電流電壓表法</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體; font-size: 13px; text-wrap: wrap; color: rgb(59, 59, 59); background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; font-family: 宋體, SimSun; font-size: 16px;"> 電流電壓表法又稱伏安法，是最原始簡(jiǎn)便的方法，它的原理是在被測(cè)繞組中通以直流電流，因而在繞組的電阻上產(chǎn)生電壓降，只要測(cè)出電路中的電流 I 和負(fù)載兩端的電壓降U，根據(jù)歐姆定律 R=U/I ，就可以計(jì)算出電阻R 。電阻的測(cè)量方法見(jiàn)圖2-3，根據(jù)測(cè)量微小電阻的需要，此時(shí)伏安法采用的是外接法。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體; font-size: 13px; text-wrap: wrap; color: rgb(59, 59, 59); background-color: rgb(255, 255, 255); text-align: center;"><img src="https://img49.afzhan.com/9/20240829/638605274785371040724.jpg" alt="直流電阻測(cè)試伏安法" width="557" height="319" title="直流電阻測(cè)試伏安法" align="" style="margin: 0px; padding: 0px; border: 0px; vertical-align: top; display: inline-block; outline: none; width: 557px; height: 319px;" /></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體; font-size: 13px; text-wrap: wrap; color: rgb(59, 59, 59); background-color: rgb(255, 255, 255);"><span style="margin: 0px; padding: 0px; font-family: 宋體, SimSun; font-size: 16px;"> 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