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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="f55nvtnxj1n" class="clear"></div> </div> </div> <div id="f55nvtnxj1n" class="nybanner"><img src="/skins/106676/images/nybanner.jpg"></div> <script src="http://www.chem17.com/mystat.aspx?u=mbdzkj"></script>  <div id="f55nvtnxj1n" class="ncontent w_1100"> <div id="f55nvtnxj1n" class="h-6">技術(shù)文章<span>您當前的位置：<a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > 萬用表電阻檔判斷電容器好壞</span></div>  <div id="f55nvtnxj1n" class="n-3 c-news"> <div id="f55nvtnxj1n" class="newsnr"> <h1>萬用表電阻檔判斷電容器好壞</h1> <p class="source"><span>日期：2024-06-29</span><span>瀏覽：357次</span></p> <div> <div id="f55nvtnxj1n" class="down_xx" style="margin: 0px; padding: 0px; list-style: none; border: 0px; font-family: "PingFang SC", Helvetica, "Microsoft YaHei", Arial, "sans-serif"; float: left; width: 967.986px; line-height: 28px; overflow-x: auto; white-space: normal;"><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px;"><span style="font-family: 宋體, SimSun; font-size: 16px;">1、如何用萬用表電阻檔檢查電解電容器的好壞<br style="clear: both;"/><br style="clear: both;"/>電解電容器的兩根引線有正、負之分，在檢查它的好壞時，對耐壓較低的電解電容器(6V或l0V)，電阻檔應(yīng)放在R×100或R×1Ｋ檔，把紅表筆接電容器的負端，黑表筆接正端，這時萬用表指針將擺動，然后恢復(fù)到零位或零位附近。這樣的電解電容器可以判斷是好的。還有，電解電容器的容量越大，充電時間越長，指針擺動得也越慢。<br style="clear: both;"/><br style="clear: both;"/>2、如何用萬用表判斷電解電容器的正、負引線<br style="clear: both;"/><br style="clear: both;"/>一些耐壓較低的電解電容器，如果正、負引線標志不清時，可儀根據(jù)它的正接時漏電電流小(電阻值大)，反接時漏電電流大的特性來判斷。具體方法是：首先，用紅、黑表筆接觸電容器的兩引線，記住漏電電流(電阻值)的大小(指針回擺并停下時所指示的阻值)，然后把此電容器的正、負引線短接一下，將紅、黑表筆對調(diào)后再測漏電電流。以漏電流小的示值為標準進行判斷，與黑表筆接觸的那根引線是電解電容器的正端。這種方法對本身漏電流小的電解電容器，則比較難于區(qū)別其的極性。<br style="clear: both;"/><br style="clear: both;"/>3、如何用萬用表檢查可變電容器<br style="clear: both;"/><br style="clear: both;"/>可變電容有一組定片和一組動片。用萬用表電阻檔可檢查它動、定片之間有否碰片，用紅、黑表筆分別接動片和定片，旋轉(zhuǎn)軸柄，電表指針不動，說明動、定片之間無短路(碰片)處；若指針擺動，說明電容器有短路的地方。<br style="clear: both;"/><br style="clear: both;"/>4、如何用萬用表電阻檔粗略鑒別5000PF以上容量電容的好壞<br style="clear: both;"/><br style="clear: both;"/>用萬用表電阻檔可大致鑒別5000PF以上電容器的好壞(5000PF以下者只能判斷電容器內(nèi)部是否被擊穿)。檢查時把電阻檔量程放在量程值，兩表筆分別與電容器兩端接觸，這時指針快速的擺動一下然后復(fù)原，反向連接，擺動的幅度比*次更大，而后又復(fù)原。這樣的電容器是好的。電容器的容量越大，測量時電表指針擺動越大，指針復(fù)原的時間也較長，我們可以根據(jù)電表指針擺動的大小來比較兩個電容器容量的大小。</span></p></div><p><br/></p> <div id="f55nvtnxj1n" class="clear"></div> </div> <div id="f55nvtnxj1n" class="article"> <p>上一篇：<a href="/Article-3736076.html">直流高壓發(fā)生器由哪些硬件組成</a></p> <p>下一篇：<a href="/Article-3736074.html">分享接地電阻測試儀的測量方法和測量原理</a></p> </div> <div id="f55nvtnxj1n" class="clear"></div> </div> </div> <div id="f55nvtnxj1n" class="n-9"> <div id="f55nvtnxj1n" class="c-right"> <div id="f55nvtnxj1n" class="c-1 r-pro"> <div id="f55nvtnxj1n" class="c-left"> <div id="f55nvtnxj1n" class="h-2"><a 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