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工頻耐電壓試驗儀概述及特點(diǎn)：</div> <div id="1571n5fppxr7" class="inpage_content"> <div id="1571n5fppxr7" class="nr_main_box"> <h1 class="inside_rnewtil">工頻耐電壓試驗儀概述及特點(diǎn)：</h1> <div id="1571n5fppxr7" class="inside_rnewtime">點(diǎn)擊次數(shù)：493 更新時間：2024-03-27</div> <div id="1571n5fppxr7" class="inside_rnewcon"><p style="line-height:150%"><strong><span style="font-family: 宋體;line-height: 150%;font-size: 14px"><span style="font-family:宋體">一．工頻耐電壓試驗儀</span></span></strong><strong><span style="font-family: 宋體; line-height: 150%;">概述及特點(diǎn)：</span></strong></p><p style="margin-left:0;text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">工頻耐電壓試驗是電機(jī)（變壓器）生產(chǎn)和使用部門檢驗電機(jī)零部件（半成品）和電機(jī)成品絕緣性能的重要試驗項目。該項性能的好壞，將直接影響電機(jī)的可靠性和人身安全。因此，工頻耐電壓試驗儀是電機(jī)生產(chǎn)、研究、運(yùn)行、維修和商檢等部門的重要試驗設(shè)備，該儀器也是電器設(shè)備安全性能試驗設(shè)備。</span></span></p><p style="margin-left:0;text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">PVT</span></span><span style=";font-family:'Times New Roman';line-height:150%;font-size:14px">-</span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">50</span><span style="font-family:宋體">型工頻耐電壓試驗儀是專門為電機(jī)（變壓器）行業(yè)設(shè)計的耐電壓試驗設(shè)備。產(chǎn)品符合</span><span style="font-family:Times New Roman">GB1032-2012</span><span style="font-family:宋體">《三相異步電機(jī)試驗方法》、</span><span style="font-family:Times New Roman">GB1311-2005</span><span style="font-family:宋體">，《直流電機(jī)試驗方法》、</span><span style="font-family:Times New Roman">GB1029-2005</span><span style="font-family:宋體">《三相同步電機(jī)試驗方法》、及</span><span style="font-family:Times New Roman">GB14711-2013</span><span style="font-family:宋體">《中小型旋轉(zhuǎn)電機(jī)安全通用要求》所提出的工頻耐電壓試驗要求。</span></span></p><p style="text-indent:28px;line-height:150%"><strong><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">特點(diǎn)一：本產(chǎn)品采用電動調(diào)壓器調(diào)節(jié)高壓試驗變壓器的初級輸入電壓以調(diào)節(jié)整機(jī)高壓輸出，升壓啟動后，按一定速率升至額定試驗值，然后采用數(shù)字表顯示時間控制試驗時間；試驗結(jié)束，電動調(diào)壓器仍按相同速率降壓至零；試驗中，產(chǎn)品的泄漏電流超出設(shè)定值，儀器自動報警并切斷高壓，電動調(diào)壓器自動降壓至零，同時電鈴報警，報警指示燈亮。本機(jī)設(shè)有放電按鈕，可釋放被試產(chǎn)品殘存電壓，保護(hù)操作人員人身安全；另外，該儀器還備有警燈作高壓警示和蘑菇型</span><span style="font-family:宋體">“緊停"按鈕。</span></span></strong><strong></strong></p><p style="text-indent:28px;line-height:150%"><strong><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">特點(diǎn)二：</span><span style="font-family:Times New Roman">PVT</span></span></strong><strong><span style=";font-family:'Times New Roman';line-height:150%;font-size:14px">-</span></strong><strong><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">3</span></span></strong><strong><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">5</span></span></strong><strong><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">型工頻耐電壓試驗儀具有查找電機(jī)故障點(diǎn)的功能：如被測品在實(shí)驗過程中報警判為不合格品，把</span><span style="font-family:宋體">“手</span><span style="font-family:Times New Roman">/</span><span style="font-family:宋體">自動"按鈕放在“手動"檔位，然后把泄漏電流設(shè)定為儀器允許的最大值，然后通過“升壓"按鈕緩慢升高試驗電壓，直到看到打火點(diǎn)為止。</span></span></strong><strong></strong></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">因此，</span><span style="font-family:Times New Roman">PVT</span></span><span style=";font-family:'Times New Roman';line-height:150%;font-size:14px">-</span><span style=";font-family:宋體;line-height:150%;font-size:14px"> </span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">35</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">型工頻耐電壓試驗儀具有功能齊全、操作方便、靈活、運(yùn)行安全可靠的特點(diǎn)，廣泛適用于電機(jī)（變壓器）行業(yè)的制造及修理單位，是提高產(chǎn)品可靠性的<a class="bjFfcClass" style="color: rgb(0, 0, 0); text-decoration: underline;"><span style="line-height: 150%; font-size: 14px; font-family: 宋體; color: rgb(0, 0, 0);">必-備</span></a>專用檢測儀器。</span></span></p><p style="line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"> </span></p><p style="line-height:150%"><strong><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">二．工頻耐電壓試驗儀技術(shù)指標(biāo)</span></span></strong><strong></strong></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">1、供電電源：380V±5﹪ ； 50H</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px">z</span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">±2﹪</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">2、輸出電壓：0～</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">35</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">kV±5﹪</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">3、電流：5</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px">~</span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">50</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">00</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px">mA</span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">±5﹪</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">4、容量：</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">50</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">KVA±10%</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">5、絕緣電阻：電源輸入端對機(jī)架的絕緣電阻≥</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px">20M</span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">Ω</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">6、介電強(qiáng)度：電源輸入端對機(jī)架能承受</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px">1500V/50Hz</span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">，</span><span style="font-family:宋體">1</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px">min</span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">耐電壓試驗無飛弧、無擊穿現(xiàn)象</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">7、環(huán)境溫度：0~40</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">°</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">C</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">8、相對濕度：35℃時≤80%；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">9、樣式：立柜式</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">10、外形尺寸：長650mm 寬 650mm高1600mm</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">11、重量：450kg</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">12、適用范圍：適用于額定電壓13800V及以下電機(jī)試驗用</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"> </span></p><p style="text-indent:13px;line-height:150%"><strong><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">三、工頻耐電壓試驗儀原理及框圖</span></span></strong><strong></strong></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">儀器接通電源后，通過按</span><span style="font-family:宋體">“升壓" 或 “降壓"按鈕調(diào)節(jié)電動調(diào)壓器的輸出端，從而產(chǎn)生</span><span style="font-family:Times New Roman">0</span><span style="font-family:宋體">～</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">35</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">kV</span><span style="font-family:宋體">高壓輸出。</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">原理框圖如圖</span><span style="font-family:Times New Roman">1</span><span style="font-family:宋體">所示。</span></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img41.chem17.com/9/20240327/638471248586331414944.png" title="PI$9R)H77[{Y78ZTY@E[C%9.png" alt="PI$9R)H77[{Y78ZTY@E[C%9.png"/></p><p style="text-indent:28px;text-align:center;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">圖</span><span style="font-family:宋體">1(原理框圖)</span></span></p><p style="text-indent: 28px; line-height: 150%;"><strong><span style="font-family: 宋體; line-height: 150%;">四、工頻耐電壓試驗儀面板介紹</span></strong></p><p style="line-height:150%"><strong></strong></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img59.chem17.com/9/20240327/638471249219089314294.png" title="D)0$8{QU3_%34`05Z9869U1.png" alt="D)0$8{QU3_%34`05Z9869U1.png"/></p><p style="text-indent:32px;text-align:center;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">圖</span><span style="font-family:宋體">2（PVT-50前面板圖）</span></span></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"> </span></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">1、</span></span><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">電源開關(guān)：接通或切斷儀器電源；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">2</span><span style="font-family:宋體">、電源指示燈：電源接通后，該指示燈亮，表示電源接通；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">3</span><span style="font-family:宋體">、升壓</span><span style="font-family:Times New Roman">/</span><span style="font-family:宋體">啟動按鈕：按下此按鈕，輸出電壓即升高，釋放后即停止升壓，同時按下此按鈕，啟動儀器輸出高壓，自動升壓；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">4</span><span style="font-family:宋體">、降壓</span><span style="font-family:Times New Roman">/</span><span style="font-family:宋體">回零指示帶燈按鈕：本機(jī)采用手動或自動雙重控制，試驗結(jié)束，儀器自動降壓至零，若試驗中需降低電壓，可按此按鈕，進(jìn)行手動調(diào)整；當(dāng)電壓回到零位后零位指示亮；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">5</span><span style="font-family:宋體">、報警指示：當(dāng)被試品擊穿后，此燈亮，報警；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">6</span><span style="font-family:宋體">、自動</span><span style="font-family:Times New Roman">/</span><span style="font-family:宋體">手動：手動檔時，需要手動升壓；自動檔時，自動升壓。</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">7</span><span style="font-family:宋體">、緊停按鈕：報警時或情況緊急時，按下此按鈕，高壓輸出全部被切斷，電動調(diào)壓器自動回零； </span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">8</span><span style="font-family:宋體">、放電按鈕：當(dāng)試驗結(jié)束，更換被試品前，按此鈕，可將繞組內(nèi)殘存電壓釋放，保障操作人員的人身安全；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">9</span><span style="font-family:宋體">、打印按鈕：按下此按鈕，打印機(jī)工作，打印試驗結(jié)果；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">10</span><span style="font-family:宋體">、設(shè)定按鈕：選擇此按鈕，可以對時間，泄漏電流，試驗電壓等進(jìn)行設(shè)定；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">11</span><span style="font-family:宋體">、增加按鈕：可以使時間，泄漏電流，試驗電壓等的初始值上升；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">12</span><span style="font-family:宋體">、減少按鈕：可以使時間，泄漏電流，試驗電壓等的初始值下降；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">13</span><span style="font-family:宋體">、打印指示燈：此燈亮，打印機(jī)處于工作狀態(tài)；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">14</span><span style="font-family:宋體">、時間顯示：顯示選定的試驗時間，以倒計時法顯示，時間降到零為完成一次試驗</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">15</span><span style="font-family:宋體">、泄漏電流顯示表（擊穿報警電流表</span><span style="font-family:Times New Roman">)</span><span style="font-family:宋體">：在設(shè)定時顯示擊穿報警電流的預(yù)設(shè)值，在試驗時顯示實(shí)際的擊穿報警電流；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">16</span><span style="font-family:宋體">、試驗電壓顯示表：在設(shè)定時顯示試驗電壓的預(yù)設(shè)值，在試驗時顯示實(shí)際的試驗電壓；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">17</span><span style="font-family:宋體">、打印機(jī)：打印試驗結(jié)果；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">18</span><span style="font-family:宋體">、接線端子板（在機(jī)箱左邊，如圖</span><span style="font-family:Times New Roman">3</span><span style="font-family:宋體">所示）；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">19</span><span style="font-family:宋體">、接地端子：</span></span><span style=";font-family:宋體;font-size:14px"><span style="font-family:宋體">外殼可靠接地</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">20</span><span style="font-family:宋體">、電源接口：</span></span><span style=";font-family:宋體;font-size:14px"><span style="font-family:宋體">接</span><span style="font-family:Times New Roman">380V/50HZ</span><span style="font-family:宋體">供電</span></span><strong></strong></p><p style="line-height:150%"><strong><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">五、工頻耐電壓試驗儀使用方法及操作步驟</span></span></strong><strong></strong></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">1</span><span style="font-family:宋體">、將輸出端子的</span><span style="font-family:Times New Roman">HV.0</span><span style="font-family:宋體">分別與被測電機(jī)的相端連接，低電位端（</span><span style="font-family:Times New Roman">0</span><span style="font-family:宋體">）與被測電機(jī)外殼連接，進(jìn)入相間耐電壓試驗狀態(tài)；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">2</span><span style="font-family:宋體">、將電源開關(guān)旋轉(zhuǎn)至“通"位置，電源指示燈亮，則儀器電源接通； </span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">3</span><span style="font-family:宋體">、儀器試驗時</span><span style="font-family:Times New Roman">,</span><span style="font-family:宋體">手動</span><span style="font-family:Times New Roman">/</span><span style="font-family:宋體">自動轉(zhuǎn)換按鈕一般放在自動檔。</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">4</span><span style="font-family:宋體">、試驗狀態(tài)的初設(shè)定，按一下設(shè)定按鈕，此時為設(shè)定試驗電壓值，運(yùn)用增減按鈕設(shè)定試驗電壓值</span><span style="font-family:Times New Roman">; </span><span style="font-family:宋體">再按一下設(shè)定按鈕，此時為設(shè)定泄漏電流的值；再按一下設(shè)定按鈕，此時為設(shè)定試驗的時間，設(shè)定完畢可以進(jìn)行試驗。按下升壓</span><span style="font-family:Times New Roman">/</span><span style="font-family:宋體">啟動按扭，電動調(diào)壓器自動升到試驗電壓的預(yù)設(shè)值，定時器開始倒計時，儀器輸出高壓；當(dāng)定時器為零時，儀器自動降壓至零，高壓切斷，試驗結(jié)束。若在試驗時間內(nèi)，被試電機(jī)擊穿，則電鈴報警，警燈轉(zhuǎn)，高壓自動切斷回到零，也可按“緊停"按鈕，消除鈴聲，電壓回到零。在電壓回到零后，要再次試驗，按下復(fù)位按鈕，使儀器狀態(tài)回復(fù)到試驗開始的初設(shè)狀態(tài)。</span></span></p><p style="text-indent:28px;line-height:150%"><strong><span style=";font-family:宋體;line-height:150%;font-size:14px"> </span></strong></p><p style="line-height:150%"><strong><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:宋體">六、注意事項</span></span></strong><strong></strong></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">1</span><span style="font-family:宋體">、儀器一定要有良好的接地保護(hù)，經(jīng)常檢查輸出電纜絕緣是否破損并即時修復(fù)；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">2</span><span style="font-family:宋體">、試驗中，如果要換另一種測試品，必須回零，重設(shè)參數(shù)；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">3</span><span style="font-family:宋體">、測試時，嚴(yán)禁帶電轉(zhuǎn)換有關(guān)按鈕，以免損壞儀器；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">4</span><span style="font-family:宋體">、每次測量完測試品之后都必須按“放電"按鈕進(jìn)行放電；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">5</span><span style="font-family:宋體">、儀器在使用完畢后防塵罩遮蓋好，防止灰塵、潮氣侵入；</span></span></p><p style="text-indent:28px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:14px"><span style="font-family:Times New Roman">6</span><span 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