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title="壓敏電阻測試儀">壓敏電阻測試儀</a></li> </div> </ul> </ul> </div> <div id="ag0icou4w4" class="page-right"> <div id="ag0icou4w4" class="onurl"> <a href="/"><img src="/Skins/333987/images/home.png"></a><a href="/">網(wǎng)站首頁</a>><a href="/article.html">技術(shù)文章</a> > DER2571數(shù)字接地電阻測試儀工作原理主要特點</div> <div id="ag0icou4w4" class="page-news"> <div id="ag0icou4w4" class="newshowheader"> <h1 class="nd_title">DER2571數(shù)字接地電阻測試儀工作原理主要特點</h1> <div id="ag0icou4w4" class="article-info"> <span> 瀏覽：</span> 2665<span id="ag0icou4w4" class="split">|</span> <span id="publishtime">更新時間：2017-09-10</span> <span id="ag0icou4w4" class="split">|</span> </div> </div> <div id="ag0icou4w4" class="page-newshow"> <p><strong>DER2571數(shù)字接地電阻測試儀工作原理主要特點</strong></p><p><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">1、工作原理</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">本表摒棄傳統(tǒng)的人工手搖發(fā)電工作方式，采用*的中大規(guī)模集成電路，應用DC/AC變換技術(shù)將三端鈕、四端鈕測量方式合并為一種機型的新型接地電阻測量儀。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">工作原理為由機內(nèi)DC/AC變換器將直流變?yōu)榻涣鞯牡皖l恒流，經(jīng)過輔助接地極C和被測物E組成回路，被測物上產(chǎn)生交流壓降，經(jīng)輔助接地極P送入交流放大器放大，再經(jīng)過檢波送入表頭顯示。借助倍率開關(guān)，可得到三個不同的量限：0～2Ω，0～20Ω，0～200Ω。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">2、使用范圍</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">本表適用于電力、郵電、鐵路、通信、礦山等部門測量各種裝置的接地電阻以及測量低電阻的導體電阻值；本表還可測量土壤電阻率及地電壓。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">3、主要特點</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">· 結(jié)構(gòu)上采用高強度鋁合金作為機殼，電路上為防止工頻、射頻干擾采用鎖相環(huán)同步跟蹤檢波方式并配以開關(guān)電容濾波器，使儀表有較好的抗干擾能力。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">· 采用DC/AC變換技術(shù)將直流變?yōu)榻涣鞯牡皖l恒定電流以便于測量。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">· 允許輔助接地電阻在0～2KΩ（RC），0～40KΩ（RP）之間變化，不致于影響測量結(jié)果。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">·本儀表不需人工調(diào)節(jié)平衡，3(1/2)位LCD顯示，除測地電阻外，還可測低電阻導體電阻、土壤電阻率以及交流地電壓。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">·如若測試回路不通表頭顯示“1”代表溢出，符合常規(guī)測量習慣。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">二、<strong>DER2571數(shù)字接地電阻測試儀</strong>技術(shù)指標</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">1、使用條件</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">環(huán)境溫度：0℃～+45℃</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">相對濕度：≤85%RH</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">2、測量范圍及恒流值（有效值）</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">電阻：0～2Ω（10mA），2～20Ω(10mA)，20～200Ω(1mA)</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">電壓：AC 0～20V</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">3、測量精度及分辨率</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">精度：0～0.2Ω≤±3%±1d</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">0.2Ω～200Ω≤±1.5%±1d</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">1～20V≤±3%±1d</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">分辨率：0.001Ω、0.01Ω、0.1Ω、0.01V</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">4、輔助接地電阻及地電壓引起的測量誤差</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">·允許輔助接地電阻RC（C1與C2之間）</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">0～2Ω，2～20Ω ≤1KΩ</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">20～200Ω ≤2KΩ</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">RP（P1與P2之間）<40KΩ 誤差≤±5%</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">·允許地電壓（工頻有效值）≤5V 誤差≤±5%</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">5、電源及功耗</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">zui大功率損耗≤2W</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">直流：8×1.5V(AA，R6)電池</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">交流：220V/50Hz</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">6、體積與重量</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">體積：220mm×200mm×105mm</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">重量：≤1.4kg</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">三、<strong>DER2571數(shù)字接地電阻測試儀</strong>使用方法</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">1、接地電阻測量（如圖一）</span><br /><img alt="" src="http://i01.yizimg.com/ComFolder/586162/201403/%E5%9B%BE%E7%89%87111.jpg" style="height:auto; margin:0px auto 5px !important; width:280px" /><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">· 沿被測接地極E（C2、P2）和電位探針P1及電流探針C1，依直線彼此相距20米，使電位探針處于E、C中間位置，按要求將探針插入大地。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">· 用導線將地阻儀端子E（C2、P2）、P1、C1與探針所在位置對應聯(lián)接。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">· 開啟地阻儀電源開關(guān)“ON”，選擇合適擋位輕按一下鍵該檔指標燈亮，表頭LCD顯示的數(shù)值即為被測得的地電阻。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">2、土壤電阻率測量（如圖二）</span><br /><img alt="" src="http://i01.yizimg.com/ComFolder/586162/201403/%E6%88%AA%E5%9B%BE20140324135627.jpg" style="height:auto; margin:0px auto 5px !important; width:262px" /><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">· 測量時在被測的土壤中沿直線插入四根探針，并使各探針間距相等，各間距的距離為L，要求探針入地深度為L/20cm，用導線分別從C1、P1、P2、C2各端子與四根探針相連接。若地阻儀測出電阻值為R，則土壤電阻率按下式計算：</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">Ф=2πRL </span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">其中</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">Ф—土壤電阻率（Ω·cm）</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">L—探針與探針之間的距離(cm)</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">R—地阻儀的讀數(shù)（Ω）</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">用此法測得的土壤電阻率可近似認為是被埋入探針之間區(qū)域內(nèi)的平均土壤電阻率。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">· 測地電阻、土壤電阻率所用的探針一般用鋁合金管或圓鋼。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">3、導體電阻測量（圖三）</span><br /><img alt="" src="http://i01.yizimg.com/ComFolder/586162/201403/%E6%88%AA%E5%9B%BE20140324135716.jpg" style="height:auto; margin:0px auto 5px !important; width:287px" /><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">4、地電壓測量</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">測量接線如圖一，撥掉C1插頭，E、P1間的插頭保留，啟動地電壓（EV）檔，指示燈亮，讀取表頭數(shù)值即為E、P1間的交流地電壓值。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">5、測量完畢按一下電源“OFF”鍵，儀表關(guān)機。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">四、注意事項</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">1、存放保管本表時，應注意環(huán)境溫度濕度，應放在干燥通風的地方為宜，避免受潮，應防止酸堿及腐蝕氣體。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">2、測量保護接地電阻時，一定要斷開電氣設(shè)備與電源連接點。在測量小于1Ω的接地電阻時，應分別用導線連在接地體上，C2在外側(cè)P2在內(nèi)側(cè)如圖四所示：</span><br /><img alt="" src="http://i01.yizimg.com/ComFolder/586162/201403/%E6%88%AA%E5%9B%BE20140324135754.jpg" style="height:auto; margin:0px auto 5px !important; width:315px" /><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">3、測量大型接地網(wǎng)接地電阻時，不能按一般接線方法測量，可參照電流表、電壓表測量法中的規(guī)定選定埋插點。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">4、測量地電阻時反復在不同的方向測量3～4次，取其平均值。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">5、本儀表為交直流兩用，不接交流電時，儀表使用電池供電，接入交流時，優(yōu)先使用交流電。</span><br /><span style="background-color:rgb(255, 255, 255); color:rgb(102, 102, 102); font-family:微軟雅黑,arial,helvetica,sans-serif; font-size:12px">6、當表頭左上角顯示“←”時表示電池電壓不足，應更換新電池。儀表長期不用時，應將電池全部取出，以免銹蝕儀表。</span></p> </div> <div id="ag0icou4w4" class="pagetb"> <p> 上一條：<a href="/Article-1349398.html">雙鉗口接地電阻測試儀主要特點面板功能簡介原理</a></p> <p> 下一條：<a 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