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id="1571n5fppxr7" class="inpage_right"> <div id="1571n5fppxr7" class="mbx2"><a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > PC-40B高絕緣電阻測量儀使用方法</div> <div id="1571n5fppxr7" class="inpage_content"> <div id="1571n5fppxr7" class="nr_main_box"> <h1 class="inside_rnewtil">PC-40B高絕緣電阻測量儀使用方法</h1> <div id="1571n5fppxr7" class="inside_rnewtime">點擊次數(shù)：542 更新時間：2024-02-25</div> <div id="1571n5fppxr7" class="inside_rnewcon"><p><span style="font-size: 16px;"><strong><span style="font-family: "Times New Roman";">PC-40B高絕緣電阻測量儀使用方法</span></strong></span></p><p><span style="font-size: 16px;"><span style="font-family: "Times New Roman"; font-size: 14px;">5.1</span><span style="font-size: 16px; font-family: 宋體;">　測試接線圖　　　　　　　　　　　　　　　　　　　　　　</span></span></p><p><span style="font-size: 16px;"><span style="font-family: "Times New Roman"; font-size: 14px;">5.1.1</span><span style="font-family: 宋體; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">　測量電工產(chǎn)品和各類元器件的絕緣電阻（如要測量大于</span><span style="font-size: 16px; font-family: "Times New Roman";">10</span></span><sup><span style="vertical-align: super; font-size: 16px; font-family: "Times New Roman";">10</span></sup><span style="font-family: 宋體; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">Ω電阻時，應(yīng)將被測物屏蔽，以免外界干擾而影響正常測試），接線如圖</span><span style="font-size: 16px; font-family: "Times New Roman";">3</span><span style="font-size: 16px; font-family: 宋體;">。</span></span></span></p><p><span style="font-family: 宋體; font-size: 16px;"></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img50.chem17.com/9/20240225/638444449567802900550.png" title="7Y(HA987EJ`2ITMAL)F}380.png" alt="7Y(HA987EJ`2ITMAL)F}380.png"/></p><p><span style="font-size: 16px; font-family: 宋體;"><br/></span></p><p style="text-align:center"><span style="font-size: 16px;"><span style="font-size: 16px; font-family: 宋體;">圖</span><span style="font-family: "Times New Roman"; font-size: 14px;">3</span><span style="font-size: 16px; font-family: 宋體;">　　測電阻</span></span></p><p><span style="font-family: 宋體; font-size: 16px;"><span style="font-size: 16px; font-family: "Times New Roman";">5.1.2</span>　用三電極系統(tǒng)測試絕緣材料的體積電阻和表面電阻。</span></p><p><span style="font-family: 宋體; font-size: 16px;">　　連接儀器和電極箱的對應(yīng)端鈕。</span></p><p><span style="font-family: 宋體; font-size: 16px;">　　按下圖將被測材料的試樣置于電極箱內(nèi)，將箱內(nèi)紅色鱷魚夾夾住測量電極，黑色鱷魚夾夾住保護(hù)電極（電極之間千萬不能互相接觸，否則將損壞儀器）。</span></p><p><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 14px;">　　<span style="font-size: 16px; font-family: "Times New Roman";">1</span><span style="font-size: 16px; font-family: 宋體;">）測試試樣體積電阻時，電極箱上的選擇開關(guān)置于</span><span style="font-size: 16px; font-family: "Times New Roman";">R</span></span><span style="font-family: "Times New Roman"; font-size: 14px;">v</span><span style="font-size: 16px; font-family: 宋體;">，此時箱內(nèi)三電極的狀態(tài)如圖</span><span style="font-family: "Times New Roman"; font-size: 14px;">4</span><span style="font-size: 16px; font-family: 宋體;">。</span></span></p><p><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 14px;">　　<span style="font-size: 16px; font-family: "Times New Roman";">2</span><span style="font-size: 16px; font-family: 宋體;">）測試試樣表面電阻時，電極箱上的選擇開關(guān)置于</span><span style="font-size: 16px; font-family: "Times New Roman";">R</span></span><span style="font-family: "Times New Roman"; font-size: 14px;">s</span><span style="font-family: 宋體; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">，此時箱內(nèi)三電極的狀態(tài)如圖</span><span style="font-size: 16px; font-family: "Times New Roman";">5</span><span style="font-size: 16px; font-family: 宋體;">。</span></span></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img60.chem17.com/9/20240225/638444444844602068808.png" title="9OB(07XYR5PFX6`A87753UK.png" alt="9OB(07XYR5PFX6`A87753UK.png"/></p><p style="text-indent:28px"><span style="font-family: 宋體; font-size: 16px;">圖中：</span></p><p style="text-indent:28px"><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">（</span><span style="font-size: 16px; font-family: "Times New Roman";">1</span><span style="font-size: 16px; font-family: 宋體;">）測量電極　（</span><span style="font-size: 16px; font-family: "Times New Roman";">2</span><span style="font-size: 16px; font-family: 宋體;">）不保護(hù)電極　</span></span><span style="font-family: "Times New Roman"; font-size: 14px;">(3)</span><span style="font-family: 宋體; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">　保護(hù)電極?。?/span><span style="font-size: 16px; font-family: "Times New Roman";">4</span><span style="font-size: 16px; font-family: 宋體;">）被測試樣</span></span></span></p><p style="text-indent:28px"><span style="font-family: 宋體; font-size: 16px;">注：本儀器所涉及三電極的尺寸是依據(jù)《<span style="font-size: 16px; font-family: "Times New Roman";">GB1410</span>固體電工絕緣材料、絕緣電阻、體積電阻系數(shù)和表面電阻系數(shù)試驗方法》中的規(guī)定制作的，其主要尺寸如下：</span></p><p><span style="font-size: 16px;"><span style="font-size: 16px; font-family: 宋體;">　　測量電極直徑</span><span style="font-family: "Times New Roman"; font-size: 14px;">d</span><span style="font-family: "Times New Roman"; font-size: 10px;">1 </span><span style="font-size: 16px; font-family: "Times New Roman";">=</span><span style="font-family: "Times New Roman"; font-size: 14px;"> 5 cm</span></span></p><p><span style="font-size: 16px;"><span style="font-size: 16px; font-family: 宋體;">　　保護(hù)電極內(nèi)徑</span><span style="font-family: "Times New Roman"; font-size: 14px;">d</span><span style="font-family: "Times New Roman"; font-size: 10px;">2 </span><span style="font-size: 16px; font-family: "Times New Roman";">=</span><span style="font-family: "Times New Roman"; font-size: 14px;"> 5.4 cm</span></span></p><p style="text-indent:28px"><span style="font-size: 16px;"><span style="font-size: 16px; font-family: 宋體;">保護(hù)電極與測量電極間的間隙</span><span style="font-family: "Times New Roman"; font-size: 14px;">g </span><span style="font-size: 16px; font-family: "Times New Roman";">=</span><span style="font-family: "Times New Roman"; font-size: 14px;"> 0.2 cm</span></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img49.chem17.com/9/20240225/638444445297784389161.png" title="V[{6HY~_SG{IT2AB9[R_2NM.png" alt="V[{6HY~_SG{IT2AB9[R_2NM.png"/></p><p style="margin-left:43px"><span style="font-size: 16px;"><span style="font-family: "Times New Roman"; font-size: 14px;">5.1.3 </span><span style="font-size: 16px; font-family: 宋體;">和恒溫水浴配套后，</span><span style="letter-spacing: -1px; font-size: 16px; font-family: 宋體;">能測量不同溫度下的塑料電線電纜的絕緣電阻。</span></span></p><p style="text-align:center"><span style="font-family: 宋體; font-size: 16px;">圖<span style="font-size: 16px; font-family: "Times New Roman";">6 </span>測量電線電纜</span></p><p><span style="font-size: 16px;"><span style="font-size: 16px; font-family: 宋體;">把被測電線電纜浸沒于水中，水應(yīng)與大地絕緣</span><span style="font-family: "Times New Roman"; font-size: 14px;">(</span><span style="font-size: 16px; font-family: 宋體;">建議采用塑料桶</span><span style="font-family: "Times New Roman"; font-size: 14px;">)</span><span style="font-family: 宋體; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">，使其兩端導(dǎo)電芯線部分露出水面至少</span><span style="font-size: 16px; font-family: "Times New Roman";">300mm</span><span style="font-size: 16px; font-family: 宋體;">。將儀器輸入端與被測電線電纜芯線相接；高壓輸出端與一根放入水中的金屬條相接。</span></span></span></p><p><span style="font-family: 宋體; font-size: 16px;"><span style="font-size: 16px; font-family: "Times New Roman";">5.2</span>　測試前的準(zhǔn)備</span></p><p><span style="font-family: 宋體; font-size: 16px;"><span style="font-size: 16px; font-family: "Times New Roman";">5.2.1</span>　各開關(guān)位置選擇</span></p><p><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 14px;">　　</span><span style="font-family: "Times New Roman"; font-size: 14px;">a</span><span style="font-family: 宋體; font-size: 14px;">　<span style="font-size: 16px; font-family: 宋體;">“電源開關(guān)"置于“關(guān)"的位置。</span></span></span></p><p><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 14px;">　　</span><span style="font-family: "Times New Roman"; font-size: 14px;">b</span><span style="font-family: 宋體; font-size: 14px;">　</span><span style="font-family: 宋體; letter-spacing: -1px; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">“額定電壓選擇"開關(guān)置于所需要的電壓檔（一般額定電壓為</span><span style="font-size: 16px; font-family: "Times New Roman";">100V</span><span style="font-size: 16px; font-family: 宋體;">）。</span></span></span></p><p><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 14px;">　　</span><span style="font-family: "Times New Roman"; font-size: 14px;">c</span><span style="font-family: 宋體; font-size: 14px;">　<span style="font-size: 16px; font-family: 宋體;">“方式選擇</span></span><span style="letter-spacing: -1px; font-size: 16px; font-family: 宋體;">"</span><span style="font-size: 16px; font-family: 宋體;">開關(guān)置于“放電"位置。</span><strong></strong></span></p><p><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 14px;">　　</span><span style="font-family: "Times New Roman"; font-size: 14px;">d</span><span style="font-family: 宋體; font-size: 14px;">　<span style="font-size: 16px; font-family: 宋體;">“電阻量程選擇</span></span><span style="letter-spacing: -1px; font-size: 16px; font-family: 宋體;">"</span><span style="font-size: 16px; font-family: 宋體;">開關(guān)置于：</span></span></p><p><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 14px;">　　　　</span><span style="font-family: "Times New Roman"; font-size: 14px;">(1)</span><span style="font-size: 16px; font-family: 宋體;">　當(dāng)被測物的阻值為已知時，則選相應(yīng)的檔。</span></span></p><p><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 14px;">　　　　</span><span style="font-family: "Times New Roman"; font-size: 14px;">(2)</span><span style="font-family: 宋體; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">　當(dāng)被測物的阻值為未知時，則選</span><span style="font-size: 16px; font-family: "Times New Roman";">10</span></span><sup><span style="vertical-align: super; font-size: 16px; font-family: "Times New Roman";">6</span></sup><span style="font-size: 16px; font-family: 宋體;">Ω的檔。</span></span></p><p style="text-indent:28px"><span style="font-size: 16px;"><span style="font-family: "Times New Roman"; font-size: 14px;">e</span><span style="font-family: 宋體; font-size: 14px;">　<span style="font-size: 16px; font-family: 宋體;">“定時</span></span><span style="letter-spacing: -1px; font-size: 16px; font-family: 宋體;">"</span><span style="font-size: 16px; font-family: 宋體;">設(shè)定開關(guān)置于“關(guān)"的位置。</span></span></p><p><span style="font-size: 16px;"><span style="font-family: "Times New Roman"; font-size: 14px;">5.2.2</span><span style="font-size: 16px; font-family: 宋體;">　接通電源，合上電源開關(guān)，電源指示燈亮。預(yù)熱</span><span style="font-family: "Times New Roman"; font-size: 14px;">10min</span><span style="font-size: 16px; font-family: 宋體;">。</span></span></p><p><span style="font-size: 16px;"><span style="font-family: "Times New Roman"; font-size: 14px;">5.3</span><span style="font-size: 16px; font-family: 宋體;">　測試步驟</span><strong><i><span style="font-size: 16px; font-family: 宋體;">（若測10</span></i></strong><strong><i><sup><span style="vertical-align: super; font-size: 16px; font-family: 宋體;">12</span></sup></i></strong><strong><i><span style="font-size: 16px; font-family: 宋體;">Ω以上電阻值，請參照附錄2）</span></i></strong></span></p><p><span style="font-size: 16px;"><span style="font-family: "Times New Roman"; font-size: 14px;">5.3.1</span><span style="font-size: 16px; font-family: 宋體;">　測試純電阻時：</span></span></p><p><br/></p><div id="1571n5fppxr7" class="tabledivclass" style="width: 99%; float: left;"><table cellpadding="0" cellspacing="0" align="left" style="max-width: 748px;"><tbody><tr class="firstRow"><td width="-460.867" height="0"><br/></td><td width="-460.867" height="0"><br/></td></tr><tr><td><br/></td><td><br/></td></tr></tbody></table><span style="font-size: 16px;"><span style="font-size: 16px; font-family: 宋體;">將“方式選擇</span><span style="font-size: 16px; font-family: 宋體; letter-spacing: -1px;">"</span><span style="font-size: 16px; font-family: 宋體;">開關(guān)置于“測試"位置，即可讀數(shù)；如用定時器時，可將“定時</span><span style="font-size: 16px; font-family: 宋體; letter-spacing: -1px;">"</span><span style="font-size: 16px; font-family: 宋體;">設(shè)定開關(guān)置于“開"的位置，待到達(dá)設(shè)定時間，即可自動鎖</span><span style="font-size: 16px; font-family: 宋體; letter-spacing: -1px;">定顯</span><span style="font-size: 16px; font-family: 宋體;">示值。在進(jìn)行下一次測試前，需將“定時"設(shè)定開關(guān)置于“關(guān)"的位置。</span></span></div><p><br/></p><p style="text-indent:28px"><span style="font-family: 宋體; font-size: 16px;">注：在測試過程中</span></p><p><span style="font-size: 16px;"><span style="font-family: 宋體; font-size: 14px;">　　<span style="font-size: 16px; font-family: "Times New Roman";">(</span></span><span style="font-family: "Times New Roman"; font-size: 14px;">1</span><span style="font-family: 宋體; font-size: 14px;"><span style="font-size: 16px; font-family: "Times New Roman";">)</span><span style="font-size: 16px; font-family: 宋體;">　　若發(fā)現(xiàn)顯示為</span><span style="font-size: 16px; font-family: "Times New Roman";">0.200</span><span style="font-size: 16px; font-family: 宋體;">以下，可將“電阻量程選擇"開關(guān)降低一檔，若降至“電阻量程選擇</span></span><span style="letter-spacing: -1px; font-size: 16px; font-family: 宋體;">"</span><span style="font-family: 宋體; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">開關(guān)為</span><span style="font-size: 16px; font-family: "Times New Roman";">10</span></span><sup><span style="vertical-align: super; font-size: 16px; font-family: "Times New Roman";">6</span></sup><span style="font-family: 宋體; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">Ω檔，顯示值仍為</span><span style="font-size: 16px; font-family: "Times New Roman";">0.200</span><span style="font-size: 16px; font-family: 宋體;">以下，即被測電阻小于</span><span style="font-size: 16px; font-family: "Times New Roman";">200</span></span><span style="font-family: "Times New Roman"; font-size: 14px;">k</span><span style="font-size: 16px; font-family: 宋體;">Ω，處于儀器的最小量限外。應(yīng)立即將“方式選擇</span><span style="letter-spacing: -1px; font-size: 16px; font-family: 宋體;">"</span><span style="font-family: 宋體; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">開關(guān)置于“放電"位置，并停止測試，以免損壞儀器。如顯示為</span><span style="font-size: 16px; font-family: "Times New Roman";">1.999</span></span><span style="font-family: "Times New Roman"; font-size: 14px;">, </span><span style="font-size: 16px; font-family: 宋體;">可將“電阻量程選擇</span><span style="letter-spacing: -1px; font-size: 16px; font-family: 宋體;">"</span><span style="font-family: 宋體; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">開關(guān)逐檔升高，直至讀數(shù)處于</span><span style="font-size: 16px; font-family: "Times New Roman";">0.200~1.999</span><span style="font-size: 16px; font-family: 宋體;">之間。</span></span></span></p><p style="text-indent:26px"><span style="font-size: 16px;"><span style="font-family: "Times New Roman"; font-size: 14px;">(2)</span><span style="font-family: 宋體; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">　在測試絕緣電阻時，如發(fā)現(xiàn)顯示值有不斷上升的現(xiàn)象，這是由于介質(zhì)的吸收現(xiàn)象所致，若在很長時間內(nèi)未能穩(wěn)定，在一般情況下是取其測試開始后</span><span style="font-size: 16px; font-family: "Times New Roman";">1</span></span><span style="font-family: "Times New Roman"; font-size: 14px;">min</span><span style="font-size: 16px; font-family: 宋體;">時的讀數(shù)，作為被測物的絕緣電阻值。</span></span></p><p><span style="font-size: 16px;"><span style="font-family: "Times New Roman"; font-size: 14px;">5.3.2</span><span style="font-size: 16px; font-family: 宋體;">　測帶容性被測物時：</span></span></p><p><span style="font-size: 16px;"><span style="letter-spacing: 0px; font-size: 16px; font-family: 宋體;">　　先將“方式選擇</span><span style="letter-spacing: -1px; font-size: 16px; font-family: 宋體;">"</span><span style="font-family: 宋體; letter-spacing: 0px; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">開關(guān)置于“充電"檔，對被測物經(jīng)一定時間的充電后（視被測物容量大小而定，一般為</span><span style="font-size: 16px; font-family: "Times New Roman";">15</span></span><span style="font-family: "Times New Roman"; letter-spacing: 0px; font-size: 14px;">s</span><span style="letter-spacing: 0px; font-size: 16px; font-family: 宋體;">，當(dāng)電容量或電阻值大時，可適當(dāng)延長充電時</span></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img57.chem17.com/9/20240225/638444446875999698108.png" title="E8]R27%OA5$VOJ4AW[Y3CHJ.png" alt="E8]R27%OA5$VOJ4AW[Y3CHJ.png"/></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img42.chem17.com/9/20240225/638444447021221423789.png" title="WH$7JISYM5H_RC12Z~Y@3R6.png" alt="WH$7JISYM5H_RC12Z~Y@3R6.png"/></p><p><span style="font-family: 宋體; font-size: 16px;">　電阻校驗</span></p><p style="text-indent:28px"><span style="font-size: 16px;"><span style="font-size: 16px; font-family: 宋體;">將儀器的“高壓輸出"端和“輸入"端按圖</span><span style="font-family: "Times New Roman"; font-size: 14px;">8</span><span style="font-size: 16px; font-family: 宋體;">與可調(diào)標(biāo)準(zhǔn)高阻箱</span><span style="font-family: "Times New Roman"; font-size: 14px;">(Rsi)</span><span style="font-size: 16px; font-family: 宋體;">相連。任選幾點高阻箱上電阻值，待儀器穩(wěn)定時讀取對應(yīng)顯示值</span><span style="font-family: "Times New Roman"; font-size: 14px;">(Rxi)</span><span style="font-size: 16px; font-family: 宋體;">，并按下式計算誤差，應(yīng)符合表</span><span style="font-family: "Times New Roman"; font-size: 14px;">2</span><span style="font-size: 16px; font-family: 宋體;">中電阻基本誤差。</span></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img60.chem17.com/9/20240225/638444447698713404908.png" title="CP@7OXIK8PN4B5OAZLSGE{4.png" alt="CP@7OXIK8PN4B5OAZLSGE{4.png"/></p><p><span style="font-size: 16px;"><span style="letter-spacing: 0px; font-size: 16px; font-family: 宋體;">間）。然后再按上</span><span style="font-family: "Times New Roman"; letter-spacing: 0px; font-size: 14px;">5</span><span style="font-family: 宋體; letter-spacing: 0px; font-size: 14px;"><span style="font-size: 16px; font-family: "Times New Roman";">.3.1</span><span style="font-size: 16px; font-family: 宋體;">步驟即可。</span></span></span></p><p><span style="font-size: 16px;"><span style="font-family: "Times New Roman"; font-size: 14px;">5.3.3</span><span style="font-family: 宋體; font-size: 14px;">　</span><span style="font-family: 宋體; letter-spacing: 0px; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">將儀器上的讀數(shù)（單位為歐姆）乘以“電阻量程選擇"開關(guān)所指示的倍率，即為被測物的絕緣電阻值。例如：讀數(shù)為</span><span style="font-size: 16px; font-family: "Times New Roman";">1.203</span><span style="font-size: 16px; font-family: 宋體;">，“電阻量程選擇"開關(guān)所指系數(shù)</span><span style="font-size: 16px; font-family: "Times New Roman";">10</span></span><sup><span style="letter-spacing: 0px; vertical-align: super; font-size: 16px; font-family: "Times New Roman";">11</span></sup><span style="font-family: 宋體; letter-spacing: 0px; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">，則被測電阻值為</span><span style="font-size: 16px; font-family: "Times New Roman";">1.203</span><span style="font-size: 16px; font-family: 宋體;">×</span><span style="font-size: 16px; font-family: "Times New Roman";">10</span></span><sup><span style="letter-spacing: 0px; vertical-align: super; font-size: 16px; font-family: "Times New Roman";">11</span></sup><span style="letter-spacing: 0px; font-size: 16px; font-family: 宋體;">Ω。</span></span></p><p><span style="font-size: 16px;"><span style="font-family: "Times New Roman"; letter-spacing: 0px; font-size: 14px;">5.3.4</span><span style="font-family: 宋體; letter-spacing: 0px; font-size: 14px;">　</span><span style="font-size: 16px; font-family: 宋體;">測試完畢，將“方式選擇</span><span style="letter-spacing: 0px; font-size: 16px; font-family: 宋體;">"</span><span style="font-family: 宋體; font-size: 14px;"><span style="font-size: 16px; font-family: 宋體;">開關(guān)撥到“放電"位置后，方可拆下被測物，如被測物的電容量較大時（約在</span><span style="font-size: 16px; font-family: "Times New Roman";">0.01</span><span style="font-size: 16px; font-family: 宋體;">μ</span><span style="font-size: 16px; font-family: "Times New Roman";">F</span><span style="font-size: 16px; font-family: 宋體;">以上者）需經(jīng)</span></span><span style="font-family: "Times New Roman"; font-size: 14px;">1min</span><span style="font-size: 16px; font-family: 宋體;">左右的放電，再能拆下被測物。</span></span></p><p><span style="font-size: 16px;"><span 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