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</div> </div> <div id="yq00aqiue" class="nybanner"><img src="/skins/106676/images/nybanner.jpg"></div> <script src="http://www.chem17.com/mystat.aspx?u=mbdzkj"></script>  <div id="yq00aqiue" class="ncontent w_1100"> <div id="yq00aqiue" class="h-6">技術(shù)文章<span>您當(dāng)前的位置：<a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > 判斷兆歐表準(zhǔn)確度的方法？</span></div>  <div id="yq00aqiue" class="n-3 c-news"> <div id="yq00aqiue" class="newsnr"> <h1>判斷兆歐表準(zhǔn)確度的方法？</h1> <p class="source"><span>日期：2025-07-01</span><span>瀏覽：20次</span></p> <div> <p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;"><strong style="box-sizing: border-box; margin: 0px;">判斷兆歐表準(zhǔn)確度的方法？</strong></span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">檢查表體無破損、刻度清晰、指針歸零正常，測試線絕緣層無老化或斷裂12；</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">確認(rèn)接線端子（L、E、G）無氧化或松動，保證接觸可靠27。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?開路與短路試驗?</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?開路測試?：斷開所有連接，啟動兆歐表，指針或數(shù)字顯示應(yīng)穩(wěn)定指向“∞"（無窮大），偏差超過±10%需校準(zhǔn)12；</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?短路測試?：將L端與E端短接，低速搖動搖柄或啟動測試，顯示值應(yīng)接近“0"（如機(jī)械表偏差＞5%需檢修）12。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?二、標(biāo)準(zhǔn)電阻校準(zhǔn)?</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?直接法驗證?</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">使用已知精度的標(biāo)準(zhǔn)高阻箱（如500MΩ、1000MΩ）連接兆歐表L/E端，對比實測值與標(biāo)稱值誤差，要求誤差≤±（2%~5%）56；</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">若誤差超限，需通過儀器內(nèi)部校正調(diào)節(jié)器（如阻抗、溫度補(bǔ)償旋鈕）調(diào)整47。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?兆歐表分流法校準(zhǔn)?</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">無標(biāo)準(zhǔn)高阻箱時，用分流電阻并聯(lián)法間接驗證，需滿足公式：<br style="box-sizing: border-box; margin: 0px;"/>??=??????????Rx=Rs?RmRs?Rm<br style="box-sizing: border-box; margin: 0px;"/>其中 ??Rx 為被測電阻，??Rs 為分流電阻，??Rm 為兆歐表讀數(shù)6。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?三、動態(tài)性能測試?</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?吸收比與極化指數(shù)?</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">測量電容性設(shè)備（如電纜）時，記錄15秒（R15s）和60秒（R60s）的絕緣電阻值，吸收比應(yīng)≥1.3（R60s/R15s），極化指數(shù)應(yīng)≥1.578；</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">若吸收比接近1或偏差明顯，表明儀器充電能力不足或內(nèi)部電路異常8。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?輸出容量測試?</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">通過負(fù)載電流法驗證，接入0.1μF電容與5000MΩ電阻并聯(lián)負(fù)載，15秒讀數(shù)應(yīng)＞4750MΩ，60秒讀數(shù)穩(wěn)定在5000MΩ±5%8；</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">輸出短路電流需≥1mA（高壓型號需≥3mA），確?？垢蓴_能力達(dá)標(biāo)8。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?四、專業(yè)校準(zhǔn)與維護(hù)?</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?環(huán)境適應(yīng)性校準(zhǔn)?</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">在15~25℃、濕度≤80%環(huán)境下校準(zhǔn)，避免溫度漂移影響精度（溫度每變化10℃，誤差允許±1%）56；</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">啟用頻率響應(yīng)法檢測不同頻率下的輸出穩(wěn)定性5。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?兆歐表定期送檢?</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">每12個月送至計量機(jī)構(gòu)，按JJG 622規(guī)程進(jìn)行全量程校準(zhǔn)，獲取檢測報告78；</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">校準(zhǔn)后需檢查自動放電功能、數(shù)據(jù)存儲等附加性能48。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?五、異常處理與維護(hù)建議?</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?顯示值波動?：檢查測試線屏蔽層是否接地，啟用濾波功能抑制工頻干擾58；</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?超量程提示（OL）?：切換更高量程檔位或檢查被測設(shè)備是否開路7；</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">?長期存放?：取出電池并存放在干燥環(huán)境，避免電路板受潮</span></p><p><br/></p> <div id="yq00aqiue" class="clear"></div> </div> <div id="yq00aqiue" class="article"> <p>上一篇：<a href="/Article-4073939.html">如何正確選擇電子式兆歐表的型號？</a></p> <p>下一篇：<a href="/Article-4073936.html">遠(yuǎn)程無線高壓核相儀用于檢測高壓線路</a></p> </div> <div id="yq00aqiue" class="clear"></div> </div> </div> <div id="yq00aqiue" class="n-9"> <div id="yq00aqiue" class="c-right"> <div id="yq00aqiue" class="c-1 r-pro"> <div id="yq00aqiue" class="c-left"> <div id="yq00aqiue" 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