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href="/article.html">技術(shù)文章</a> > ET3000雙鉗數(shù)字接地電阻測(cè)試儀講解</div> <div id="sh7gbfdki" class="page-news"> <div id="sh7gbfdki" class="newshowheader"> <h1 class="nd_title">ET3000雙鉗數(shù)字接地電阻測(cè)試儀講解</h1> <div id="sh7gbfdki" class="article-info"> <span> 瀏覽：</span> 789<span id="sh7gbfdki" class="split">|</span> <span id="publishtime">更新時(shí)間：2021-12-21</span> <span id="sh7gbfdki" class="split">|</span> </div> </div> <div id="sh7gbfdki" class="page-newshow"> <p><strong style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);">ET3000雙鉗數(shù)字接地電阻測(cè)試儀講解</strong><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">一、</span><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">引言</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">歡迎使用高質(zhì)量專業(yè)測(cè)試儀表ET3000雙鉗多功能接地電阻測(cè)試儀，該儀器用于接地電阻的測(cè)量，并在此基礎(chǔ)上評(píng)價(jià)接地質(zhì)量。該儀器是基于我們多年接地電阻和電氣安裝測(cè)試設(shè)備的生產(chǎn)和開發(fā)經(jīng)驗(yàn)設(shè)計(jì)并制造。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">是一種手持式的接地測(cè)量?jī)x。儀器配備有測(cè)試所必需的附件。操作簡(jiǎn)單、直觀，操作者只需要閱讀說(shuō)明書而不必參加專門的培訓(xùn)就能夠操作。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">二、<strong style="margin: 0px; padding: 0px; border: 0px; color: rgb(102, 102, 102); font-family: 微軟雅黑; font-size: 12px; white-space: normal; background-color: rgb(255, 255, 255);">ET3000雙鉗數(shù)字接地電阻測(cè)試</strong><strong style="margin: 0px; padding: 0px; border: 0px; color: rgb(102, 102, 102); font-family: 微軟雅黑; font-size: 12px; white-space: normal; background-color: rgb(255, 255, 255);">儀</strong></span><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">概述</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">優(yōu)良的接地系統(tǒng)是電力、電信、電氣設(shè)備安全可靠運(yùn)行的重要保證。接地電阻大小是接地系統(tǒng)品質(zhì)優(yōu)劣的評(píng)判依據(jù)。、快速、簡(jiǎn)捷、可靠的接地電阻測(cè)量方法，已成為防雷接地領(lǐng)域內(nèi)技術(shù)進(jìn)步的迫切需要。ET3000雙鉗多功能接地電阻測(cè)試儀適用于電信、電力、氣象、機(jī)房、電力配電線路、鐵塔輸電線路、加油站、工廠接地網(wǎng)、避雷針等。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">該儀器除了具有傳統(tǒng)打輔助地測(cè)接地電阻的功能外，還具備了無(wú)輔助地測(cè)量的*功能，改變了測(cè)試接地電阻傳統(tǒng)的測(cè)量原理和手段：采用雙鉗口非接觸測(cè)量技術(shù)無(wú)需打輔助地，也無(wú)需將接地體與負(fù)載隔離，實(shí)現(xiàn)了在線測(cè)量。在單點(diǎn)接地系統(tǒng)、干擾性強(qiáng)等條件下，可以采用打輔助地的測(cè)量方式進(jìn)行測(cè)量。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">三、<strong style="margin: 0px; padding: 0px; border: 0px; color: rgb(102, 102, 102); font-family: 微軟雅黑; font-size: 12px; white-space: normal; background-color: rgb(255, 255, 255);">ET3000雙鉗數(shù)字接地電阻測(cè)試儀</strong></span><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">主要特點(diǎn)</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">1．雙鉗法/地樁法雙重測(cè)量方式：</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">適合任意接地場(chǎng)所，多點(diǎn)或單點(diǎn)接地，都可正常測(cè)試；</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">2．抗干擾能力強(qiáng)：</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">自產(chǎn)生高頻電流，從而過(guò)濾市電中50Hz、100Hz等諧波干擾電流，即使在500KV變電站環(huán)境下，也能測(cè)量；</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">3．測(cè)量范圍廣、分辨率高：</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">量程從0.01Ω～200Ω，分辨率0.01Ω，對(duì)0.7Ω以下接地電阻，也能準(zhǔn)確測(cè)量；</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">4．大鉗口設(shè)計(jì)：</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">鉗口直徑50mm（標(biāo)準(zhǔn)配置），滿足用扁鐵/鋼作接地引線的情況，特殊鉗口尺寸可按客戶要求定制；</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">5．大容量數(shù)據(jù)存儲(chǔ)：</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">可儲(chǔ)存200組測(cè)量數(shù)據(jù)；</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">6．操作簡(jiǎn)單，單人作業(yè)：</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">全中文操作界面、體積小、重量輕，防爆便攜箱，野外測(cè)量攜帶方便。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">四、</span><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">主要技術(shù)指標(biāo)</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">1．接地電阻測(cè)量范圍：</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">雙鉗法：0.01Ω～200Ω</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">地樁法：0.01Ω～200Ω</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">2．準(zhǔn)確度:</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">雙鉗法：±3%±2個(gè)字</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">地樁法：±2%±2個(gè)字</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">3．小分辨率：0.01Ω</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">4．鉗口尺寸：Φ50mm </span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">5．存儲(chǔ)容量：200組數(shù)據(jù)</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">6．工作溫度：0oC ～ + 50°C</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">7．供電方式：8節(jié)5號(hào)鎳氫充電電池或普通AA電池</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">8．重量：0.8KG(含電池)</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">9．尺寸：265mm×130mm×65mm</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">五、面板功能簡(jiǎn)介</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">1、按鍵功能</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">本機(jī)共設(shè)七個(gè)按鍵，具體功能如下：</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">“電源"：電源開關(guān)鍵；在開機(jī)后，5分鐘不做任何操作會(huì)自動(dòng)關(guān)機(jī)。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">“雙鉗法▲"：在多點(diǎn)接地的接地網(wǎng)中，用這種方式進(jìn)行測(cè)試；另外，在其它功能時(shí)，此鍵為向上光標(biāo)或增加鍵。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">“地樁法▼"：按此鍵采用打輔助地樁的方式測(cè)量接地電阻，另外，在其它功能時(shí)，此鍵為向下光標(biāo)或減小鍵。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">“"：光標(biāo)左移鍵。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">“"：光標(biāo)右移鍵。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">“測(cè)試"：在雙鉗法或地樁法測(cè)量時(shí)，按此鍵開始測(cè)量。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">“確認(rèn)"：按此鍵進(jìn)入選定的功能。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">2、測(cè)試端口（見圖1所示）</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img76.chem17.com/9/20211221/637756697475069927514.png" title="HCU%QYYT$BI)R0[}_S`BX4W.png" alt="HCU%QYYT$BI)R0[}_S`BX4W.png"/></p><p><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">圖1 面板接線柱</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">該儀表與外界連接的接口有兩組：雙鉗法使用上部的“接收"和“發(fā)射"兩個(gè)航插；地樁法使用下部的“C2"、“P2"、“P1"和“C1"四個(gè)插孔。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">充電插孔位于儀器的左下方，當(dāng)儀表顯示屏左上角的電量指示變低時(shí)，請(qǐng)用本公司配套的地阻儀充電器進(jìn)行充電。該充電器為智能充電器，當(dāng)電池充滿時(shí)，即充電器指示燈熄滅時(shí)，自動(dòng)停止對(duì)電池進(jìn)行充電，有效防止電池過(guò)充。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">注意：儀表長(zhǎng)期不用時(shí)，應(yīng)定期對(duì)電池進(jìn)行充電（如兩個(gè)月），避免電池過(guò)度放電而損壞。用普通電池時(shí)切勿充電。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">六、測(cè)量原理及使用方法</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">㈠、雙鉗法</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">1、測(cè)量原理</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">此方法的優(yōu)點(diǎn)在于：一是操作簡(jiǎn)單?？梢栽诓粩嚅_待測(cè)設(shè)備電源，在其正常工作時(shí)進(jìn)行測(cè)試，不必插入測(cè)量探頭，也不必將被測(cè)電分開，只需要雙鉗夾著接地導(dǎo)體就可以測(cè)出其接地電阻。二是精度高。其精度可以達(dá)到0.01Ω。三是抗干擾能力強(qiáng)?？梢詾V出各種工頻諧波。四是可以作為打地樁方式的補(bǔ)充。在很多條件下（如房屋密集或鋪滿水泥的地區(qū)），很難甚至不可能采用打樁的方式對(duì)接地電阻的測(cè)量，使用雙鉗口測(cè)試原理，可以不用打接地樁進(jìn)行測(cè)量。該測(cè)量原理的*的不足是：不能夠直接對(duì)單點(diǎn)接地系統(tǒng)的測(cè)量。在單點(diǎn)接地系統(tǒng)中應(yīng)慎用鉗形地阻表。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">其測(cè)量原理簡(jiǎn)述如下：本儀表配有兩個(gè)鉗口：電壓鉗和電流鉗。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">如圖2所示，電壓鉗在被測(cè)回路中激勵(lì)出一個(gè)感應(yīng)電勢(shì)E，并在被測(cè)回路產(chǎn)生電流I，儀表通過(guò)電流鉗可以測(cè)得I值。通過(guò)對(duì)E、I的測(cè)量，由歐姆定律：R=E/I，即可求得R的值。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img78.chem17.com/9/20211221/637756697718621484498.png" title="_%{NJ5F]J0M(~[[PPNQ[SHE.png" alt="_%{NJ5F]J0M(~[[PPNQ[SHE.png"/></p><p><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">圖2 測(cè)量原理</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">2、多并聯(lián)接地電阻的測(cè)量</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">對(duì)多點(diǎn)接地系統(tǒng)（例如輸電系統(tǒng)桿塔接地、通信電纜接地系統(tǒng)、某些建筑物等），它們通過(guò)架空地線（通信電纜的屏蔽層）連接，組成了接地系統(tǒng)。如圖3所示：</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img77.chem17.com/9/20211221/637756698079350473677.png" title="EEA3_KK_0W1R]YPUM7_FBGD.png" alt="EEA3_KK_0W1R]YPUM7_FBGD.png"/></p><p><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">圖3 多點(diǎn)接地系統(tǒng)地阻的測(cè)量</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">當(dāng)用鉗表將兩個(gè)鉗口鉗入被測(cè)接地線上，兩個(gè)鉗口的間距為30cm左右，發(fā)射鉗夾插入“發(fā)射"航插孔，接收鉗夾插入“接收"航插孔，兩航插孔不可互換，（如上圖測(cè)量時(shí)），其等效電路見下圖。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img78.chem17.com/9/20211221/637756699572825598691.png" title="N%KJL(X[2CRX(Q$U@SN]%FY.png" alt="N%KJL(X[2CRX(Q$U@SN]%FY.png"/></p><p><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">則RT =Rx+ R0</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">其中：</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">RT：儀表測(cè)量出的值</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">Rx：待測(cè)接地電阻</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">R0：所有其它桿塔的接地電阻并聯(lián)后的等效電阻。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">雖然，從嚴(yán)格的接地理論來(lái)說(shuō)，由于有所謂的“互電阻"的存在，R0并不是通常的電工學(xué)意義上的并聯(lián)值（它會(huì)比電工學(xué)意義上的并聯(lián)值稍大），但是，由于每一個(gè)桿塔的接地半球比起桿塔之間的距離要小得多，而且畢竟接地點(diǎn)數(shù)量很大，R0要比R1小得多。因此，可以從工程角度有理由地假設(shè)R0=0。這樣，我們所測(cè)的電阻就應(yīng)該是RX了，即RT≈Rx。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">多次不同環(huán)境、不同場(chǎng)合下與傳統(tǒng)方法進(jìn)行對(duì)比試驗(yàn)，證明上述假設(shè)是*合理的。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">非接觸測(cè)量法（即雙鉗法）是一種*的測(cè)量技術(shù)，具有諸多優(yōu)點(diǎn)。不過(guò)，測(cè)試儀測(cè)得的電阻是包括被測(cè)接地電阻在內(nèi)的整個(gè)回路的電阻。使用中必須牢記這一點(diǎn)，以利對(duì)測(cè)量結(jié)果的分析。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">注意：發(fā)射鉗夾，接收鉗夾不可互換。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">3、雙鉗法測(cè)獨(dú)立接地體的方法</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">a、雙鉗法在測(cè)試過(guò)程中，一定要有一個(gè)有效的閉合回路。解決的辦法是找一個(gè)輔助接電，將被測(cè)接地體與接地良好的輔助地（如自來(lái)水管等）用連接線連在一起，將二個(gè)鉗口鉗入連接線上，（圖5所示）：二者間距30cm左右，此時(shí)按“雙鉗"鍵，進(jìn)行雙鉗法測(cè)量界面，再按“測(cè)試"鍵直接顯示測(cè)量結(jié)果。測(cè)試獨(dú)立接地體接地電阻時(shí)可根據(jù)不同的情況采用不同的測(cè)試方法。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">b、當(dāng)機(jī)房處于低樓層時(shí)（一、二層）可采用地樁測(cè)試方法，直接測(cè)出接地電阻。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">機(jī)房處于較高樓層時(shí)，（二層以上），可采用“獨(dú)立接地體"測(cè)試方法此種方法是基于將自來(lái)水管網(wǎng)的接地電阻理論上認(rèn)為是零歐姆，但實(shí)際上是有電阻值的，此時(shí)測(cè)試分為二步：*步，按“獨(dú)立接地體"測(cè)試方法測(cè)出RA；第二步，單獨(dú)在一樓將自來(lái)水管的接地電阻按“地樁"測(cè)試方法測(cè)出RB（此時(shí)自來(lái)水管看作獨(dú)立接地體），（RA－RB）即為機(jī)房接地裝置的實(shí)際接地電阻。 </span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img80.chem17.com/9/20211221/637756699795945804306.png" title="}VM38QZE))G[6DA$%YEBYY0.png" alt="}VM38QZE))G[6DA$%YEBYY0.png"/></p><p><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">圖5 獨(dú)立接地體地阻測(cè)量</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">雙鉗法測(cè)電阻時(shí)，如果測(cè)量值顯示溢出，則說(shuō)明被測(cè)電阻已超過(guò)本儀表的測(cè)量范圍或說(shuō)明鉗口沒有鉗繞任何金屬導(dǎo)體或被測(cè)接地線。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">㈡、地樁法</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">采用圖6的連接方法。此時(shí)按“地樁"鍵，進(jìn)入地樁法測(cè)試界面。再按“測(cè)試"鍵可更地測(cè)量出被測(cè)接地體的接地電阻值。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img80.chem17.com/9/20211221/637756700399509804743.png" title="4ZUJ~8W~A7IG$MY2R}W_[CS.png" alt="4ZUJ~8W~A7IG$MY2R}W_[CS.png"/></p><p><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">㈢、存儲(chǔ)</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">每次測(cè)量后，可存貯測(cè)量結(jié)果。按左移鍵或右移鍵，將光標(biāo)停在“存儲(chǔ)"上，按“確認(rèn)"鍵進(jìn)入存儲(chǔ)功能。輸入要存儲(chǔ)或查看的目號(hào)，然后按“確認(rèn)"即可存儲(chǔ)，例如要將測(cè)量數(shù)據(jù)存儲(chǔ)到第7組內(nèi)，則將目號(hào)調(diào)整至007。再按“確認(rèn)"鍵，進(jìn)行確認(rèn)，即可完成存儲(chǔ)。如該目號(hào)已存有數(shù)據(jù)，則原數(shù)據(jù)被覆蓋。繼續(xù)測(cè)試，按“確認(rèn)"鍵，返回測(cè)試狀態(tài)。本機(jī)可存儲(chǔ)200組數(shù)據(jù)。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">㈣、查看/刪除</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">在雙鉗法和地樁法測(cè)試界面，將光標(biāo)移到“返回"上，再按“確認(rèn)"鍵，即右進(jìn)入主菜單，再按“▲"“▼"鍵，選擇 “查看歷史數(shù)據(jù)"或“刪除歷史數(shù)據(jù)"。再按“確認(rèn)"鍵，進(jìn)入相應(yīng)的功能。按“" “"左右調(diào)整，按“▲" 、“▼"調(diào)整數(shù)字，按“確認(rèn)"鍵進(jìn)行確認(rèn)，即可查閱存儲(chǔ)數(shù)值或刪除存儲(chǔ)的數(shù)值。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">㈤、保持</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">在雙鉗法，地樁法測(cè)試過(guò)程中，由于環(huán)境影響及外界干擾等因素，可能會(huì)出現(xiàn)數(shù)值不穩(wěn)定的現(xiàn)象。在雙鉗法、地樁法測(cè)試界面，當(dāng)光標(biāo)停留在“保持"上時(shí)可以按“確認(rèn)"鍵對(duì)測(cè)量數(shù)值進(jìn)行鎖定，便于測(cè)量者進(jìn)行記錄和讀取數(shù)值。此時(shí)屏幕上“保持"變?yōu)椤敖獬?，再按一下“確認(rèn)"即可解除鎖定功能。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">七、注意事項(xiàng)</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">1、鉗口和主機(jī)為配套使用，出廠前已按要求配好。為避免測(cè)量誤差，本主機(jī)所配鉗口不得用于其他主機(jī)上。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">2、任何時(shí)候都要保護(hù)鉗口鐵芯接觸面的清潔，被污染的鉗口會(huì)降低儀表的測(cè)量準(zhǔn)確度。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">3、測(cè)試時(shí)，要保持鉗口閉合良好，不可出現(xiàn)卡殼現(xiàn)象。</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">八、配套附件</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">1. 主機(jī)（包含8節(jié)充電電池） 1臺(tái)</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">2. 校驗(yàn)環(huán) 1個(gè)</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">3. 測(cè)試線 1套</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">4. 繞線架（20米黑線，40紅線） 1套</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">5. 地樁 2根</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">6. 充電器 1個(gè)</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">7. 測(cè)試鉗 2把</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">8. 鋁合金外箱 1個(gè)</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">9. 說(shuō)明書 1本</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">10.出廠檢驗(yàn)報(bào)告 1張</span><br style="margin: 0px; color: rgb(85, 85, 85); font-family: Tahoma; background-color: rgb(255, 255, 255);"/><span style="margin: 0px; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255); font-family: "microsoft yahei";">11.合格證 1張</span><br/></p> </div> <div id="sh7gbfdki" class="pagetb"> <p> 上一條：<a href="/Article-2882833.html">FRC系列交直流數(shù)字分壓器測(cè)量操作步驟</a></p> <p> 下一條：<a href="/Article-2879974.html">RXLG鋁殼電阻器的詳細(xì)資料</a></p> </div> </div> </div> </div> <div id="sh7gbfdki" class="footer"> <div id="sh7gbfdki" 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