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<div id="ubjn47ipz" class="clear"></div> </div> </div> <div id="ubjn47ipz" class="nybanner"><img src="/skins/106676/images/nybanner.jpg"></div> <script src="http://www.chem17.com/mystat.aspx?u=mbdzkj"></script>  <div id="ubjn47ipz" class="ncontent w_1100"> <div id="ubjn47ipz" 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> > 一體化精密油介損體積電阻率測試儀工作原理</span></div>  <div id="ubjn47ipz" class="n-3 c-news"> <div id="ubjn47ipz" class="newsnr"> <h1>一體化精密油介損體積電阻率測試儀工作原理</h1> <p class="source"><span>日期：2018-09-16</span><span>瀏覽：1870次</span></p> <div> <p><span style="font-size:16px"><strong><span style="font-family:宋體">一體化精密油介損體積電阻率測試儀工作原理</span></strong></span></p><ul style="list-style-type:square"><li><span style="font-size:16px"><strong><span style="font-family:宋體">加熱</span></strong></span></li></ul><p><span style="font-size:16px"><strong><span style="font-family:宋體">儀器采用高頻感應(yīng)爐加熱，啟動加熱后，溫控CPU發(fā)出加熱命令，同時采集油杯內(nèi)部溫度傳感器的溫度值，加熱采用變功率控制和PWM控制兩者相結(jié)合的控制方式。在油樣溫度較低時，用大功率加熱方式，這有利于縮短油樣加熱時間；待溫度升至接近預(yù)設(shè)溫度時，采用較小功率PWM加熱方式，這樣有利于油樣加熱均勻。</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">高頻感應(yīng)爐加熱避免了發(fā)熱塊加熱不均勻的現(xiàn)象。</span></strong></span></p><p><span style="font-size:16px"><img alt="" src="http://img47.chem17.com/9/20180916/636726780641178173823.jpg" style="height:960px; width:1280px" /></span></p><ul style="list-style-type:square"><li><span style="font-size:16px"><strong><span style="font-family:宋體">控溫</span></strong></span></li></ul><p><span style="font-size:16px"><strong><span style="font-family:宋體">在實測溫度接近預(yù)設(shè)溫度時，溫控CPU采用小功率PWM方式加熱，采樣溫度值經(jīng)PID運算，分析出jiaPWM控制占空比，使溫度嚴(yán)格控制在預(yù)設(shè)溫度誤差范圍以內(nèi)。</span></strong></span></p><p> </p><ul style="list-style-type:square"><li><span style="font-size:16px"><strong><span style="font-family:宋體">介損測量</span></strong></span></li></ul><p><span style="font-size:16px"><strong><span style="font-family:宋體">試驗電壓同時加在儀器內(nèi)部標(biāo)準(zhǔn)電容器及油杯加壓極上，測量電路對這兩路信號進行PGA等控制后對兩通道信號進行同步AD采樣，將數(shù)字信號送DSP（數(shù)字信號處理器），DSP對其進行濾波、FFT等運算后計算出tgδ、</span></strong><strong><span style="font-family:times new roman">C x </span></strong><strong><span style="font-family:宋體">、ε等參數(shù)，送主控CPU。</span></strong></span></p><p> </p><ul style="list-style-type:square"><li><span style="font-size:16px"><strong><span style="font-family:宋體">體積電阻率測量</span></strong></span></li></ul><p><span style="font-size:16px"><strong><span style="font-family:宋體">直流高壓試驗電壓加在油杯加壓極上，經(jīng)過測試回</span></strong><strong><span style="font-family:宋體">路，產(chǎn)生一微弱電流信號，該微弱電流信號經(jīng)</span></strong><strong><span style="font-family:宋體">測量電路放大后送進A</span></strong><strong><span style="font-family:宋體">D</span></strong><strong><span style="font-family:宋體">采樣</span></strong><strong><span style="font-family:宋體">，</span></strong><strong><span style="font-family:宋體">將數(shù)字信號送DSP（數(shù)字信號處理器），DSP對其信號進行處理</span></strong><strong><span style="font-family:宋體">，計算出Rx、ρ</span></strong><strong><span style="font-family:宋體">等參數(shù)，送主控CPU。</span></strong></span></p><p> </p><p><span style="font-size:16px"><strong><span style="font-family:宋體">4.名詞解釋</span></strong></span></p><ul style="list-style-type:square"><li><span style="font-size:16px"><strong><span style="font-family:宋體">試驗源為AC </span></strong><strong><span style="font-family:宋體">tg</span></strong><strong><span style="font-family:宋體">δ ：油樣介質(zhì)損耗角正切值；</span></strong></span></li></ul><p><span style="font-size:16px"><strong><span style="font-family:宋體">Cx ：</span></strong><strong><span style="font-family:宋體">油樣油杯的電容值；</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">εr ：</span></strong><strong><span style="font-family:宋體">相對介電常數(shù)，是根據(jù)電容值換算而得到的；</span></strong></span></p><ul style="list-style-type:square"><li><span style="font-size:16px"><strong><span style="font-family:宋體">試驗源為DC </span></strong> <strong><span style="font-family:宋體">Rx </span></strong><strong><span style="font-family:宋體">：</span></strong><strong><span style="font-family:宋體">油樣的絕緣電阻；</span></strong></span></li></ul><p><span style="font-size:16px"><strong><span style="font-family:宋體">ρ </span></strong><strong><span style="font-family:宋體">：</span></strong><strong><span style="font-family:宋體">油樣的體積電阻率，是根據(jù)絕緣電阻換算而得到的；</span></strong></span></p><p> </p><table border="1" cellspacing="0" style="border-collapse:collapse; border:none; width:619px"><tbody><tr><td style="vertical-align:top; width:619px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">基于上述兩種不同的試驗電源對油樣有不同的極化效應(yīng)，因而重復(fù)測試時，中間必須有足夠的放電時間！否則數(shù)據(jù)不可靠！</span></strong></span></p></td></tr></tbody></table><p><span style="font-size:16px"><strong><span style="font-family:黑體">五、主要技術(shù)指標(biāo)</span></strong></span></p><p style="text-align:center"> </p><table align="center" border="1" cellspacing="0" style="border-collapse:collapse; border:none; width:583px"><tbody><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">1</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">使用條件</span></strong></span></p></td><td colspan="2" style="vertical-align:center; width:372px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">-15℃∽40℃ RH＜80%</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">2</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">電源</span></strong></span></p></td><td colspan="2" style="vertical-align:center; width:372px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">AC 220V±10% 頻率無限制</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">3</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">交流高壓輸出</span></strong></span></p></td><td colspan="2" style="vertical-align:center; width:372px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">400V∽2200V ±2% 每隔100V 50VA</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">4</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">直流高壓輸出</span></strong></span></p></td><td colspan="2" style="vertical-align:center; width:372px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">200V∽600V ±2% 每隔50V</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">5</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">溫控感應(yīng)爐</span></strong></span></p></td><td colspan="2" style="vertical-align:center; width:372px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">大功率500W</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">6</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">溫度控制范圍</span></strong></span></p></td><td colspan="2" style="vertical-align:center; width:372px"><p><span style="font-size:16px"><strong><span style="font-family:宋體"><100℃</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">7</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">溫度控制誤差</span></strong></span></p></td><td colspan="2" style="vertical-align:center; width:372px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">±0.5℃</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">8</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">溫度測量分辨率</span></strong></span></p></td><td colspan="2" style="vertical-align:center; width:372px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">0.1℃</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">9</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">控溫時間</span></strong></span></p></td><td colspan="2" style="vertical-align:center; width:372px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">室溫到90℃ 小于20min</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">10</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">測量范圍</span></strong></span></p></td><td style="vertical-align:center; width:80px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">tgδ</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:times new roman">C x</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">R</span></strong></span></p></td><td style="vertical-align:center; width:292px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">無限制</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">15PF-300PF</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">10M-20T</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">11</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">分辨率</span></strong></span></p></td><td style="vertical-align:top; width:80px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">△ tgδ</span></strong><strong><span style="font-family:times new roman">：</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">△ Cx </span></strong><strong><span style="font-family:times new roman">：</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">△</span></strong> <strong><span style="font-family:宋體">R</span></strong><strong><span style="font-family:times new roman">x</span></strong> <strong><span style="font-family:times new roman">：</span></strong></span></p></td><td style="vertical-align:top; width:292px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">0.001%</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">0.01pF</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">0.01</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">12</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">精度</span></strong></span></p></td><td style="vertical-align:top; width:80px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">△ tgδ</span></strong><strong><span style="font-family:times new roman">：</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">△ Cx </span></strong><strong><span style="font-family:times new roman">：</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">△</span></strong> <strong><span style="font-family:宋體">R</span></strong><strong><span style="font-family:times new roman">x</span></strong> <strong><span style="font-family:times new roman">：</span></strong></span></p></td><td style="vertical-align:top; width:292px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">±</span></strong><strong><span style="font-family:times new roman">(</span></strong><strong><span style="font-family:宋體">讀數(shù)*0.5</span></strong><strong><span style="font-family:times new roman">%+0.0</span></strong><strong><span style="font-family:宋體">20</span></strong><strong><span style="font-family:times new roman">%)</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">±</span></strong><strong><span style="font-family:times new roman">(</span></strong><strong><span style="font-family:宋體">讀數(shù)*0</span></strong><strong><span style="font-family:times new roman">.</span></strong><strong><span style="font-family:宋體">5</span></strong><strong><span style="font-family:times new roman">%+0.5PF)</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">±讀數(shù) * </span></strong><strong><span style="font-family:times new roman">10%</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">13</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">相對介電常數(shù)</span></strong></span></p></td><td style="vertical-align:center; width:80px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">ε</span></strong><strong><span style="font-family:宋體">r</span></strong> </span></p></td><td style="vertical-align:center; width:292px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">根據(jù)Cx自動計算，精度同Cx</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">14</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">體積電阻率</span></strong></span></p></td><td style="vertical-align:center; width:80px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">ρ </span></strong></span></p></td><td style="vertical-align:center; width:292px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">根據(jù)Rx自動計算，精度同Rx</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">15</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">外形尺寸</span></strong></span></p></td><td colspan="2" style="vertical-align:center; width:372px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">410（L）×310（W）×305（H）</span></strong></span></p></td></tr><tr><td style="vertical-align:center; width:43px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">16</span></strong></span></p></td><td style="vertical-align:center; width:168px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">重量</span></strong></span></p></td><td colspan="2" style="vertical-align:center; width:372px"><p><span style="font-size:16px"><strong><span style="font-family:宋體">18Kg</span></strong></span></p></td></tr></tbody></table> <div id="ubjn47ipz" class="clear"></div> </div> <div id="ubjn47ipz" class="article"> <p>上一篇：<a href="/Article-1638463.html">QJ23直流單臂電阻橋【上?？档请姎饪萍加邢薰尽?/a></p> <p>下一篇：<a href="/Article-1638461.html">LK2672交直流耐壓測試儀，5KV耐壓測試儀</a></p> </div> <div id="ubjn47ipz" 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