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rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"><strong style="box-sizing: border-box;">UJ25型直流電位差計(jì)</strong></span><span style="box-sizing: border-box;">?講解</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 一、概述</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> <strong style="box-sizing: border-box;">UJ25型直流電位差計(jì)</strong>適用于實(shí)驗(yàn)室和計(jì)量部門作精密測量，可直接用來測量直流電勢，亦可用它作為標(biāo)準(zhǔn)儀器來校驗(yàn)0.02級直流電位差計(jì)，配用標(biāo)準(zhǔn)電阻時(shí)可以測量直流電流和電阻，以及校驗(yàn)功率表。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 二、技術(shù)數(shù)據(jù)</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 2.1使用條件</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 2.1.1基本誤差的參考條件：</span><span style="box-sizing: border-box;">周圍環(huán)境溫度：20±1℃，相對濕度50%±10%，準(zhǔn)確度等級指數(shù)0.01。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 2.1.2空氣中不含有腐蝕性氣體和有害雜質(zhì)。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 2.2基本誤差極限：</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> Elim=±(10-5+10-4X)V</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 式中：Elim——誤差的允許極限值V</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> X——標(biāo)度盤值</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 2.3測量范圍</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 2.3.1電位差計(jì)的測量上限為1.911110V，最小分度為1μV。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 2.3.2配用壓箱擴(kuò)大測量范圍后，電位差計(jì)測量上限可擴(kuò)大到600V。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 2.4工作電流：</span><span style="box-sizing: border-box;">電位差計(jì)的工作電流為0.1mA，相當(dāng)于毎伏10kΩ。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 2.5變差極限：</span><span style="box-sizing: border-box;">當(dāng)電位差計(jì)在參考條件下，而單一影響量發(fā)生變化時(shí)，由此產(chǎn)生的變差如下表如示：</span></p><p style="width: 99%; height: 119px;"><br/></p><div id="1571n5fppxr7" class="tabledivclass" style="width: 99%; height: 119px;"><table border="1" align="left" width="621" style="max-width: 748px;"><tbody style="box-sizing: border-box;"><tr style="box-sizing: border-box;" class="firstRow"><td style="box-sizing: border-box;"><p style="box-sizing: border-box; margin-bottom: 1.51563px;"><span style="box-sizing: border-box;">影響量</span></p></td><td style="box-sizing: border-box;"><p style="box-sizing: border-box; margin-bottom: 1.25px;"><span style="box-sizing: border-box;">等級指數(shù)%</span></p></td><td style="box-sizing: border-box;"><p style="box-sizing: border-box; margin-bottom: 2.01563px;"><span style="box-sizing: border-box;">標(biāo)稱使用范圍極限</span></p></td><td style="box-sizing: border-box;"><p style="box-sizing: border-box; margin-bottom: 1.35938px;"><span style="box-sizing: border-box;">允許變差 ①</span></p></td></tr><tr style="box-sizing: border-box;"><td style="box-sizing: border-box;"><p style="box-sizing: border-box; margin-bottom: 1.51563px;"><span style="box-sizing: border-box;">周圍溫度</span></p></td><td rowspan="3" style="box-sizing: border-box;"><p style="box-sizing: border-box; margin-bottom: 1.25px;"><span style="box-sizing: border-box;">0.01</span></p></td><td style="box-sizing: border-box;"><p style="box-sizing: border-box; margin-bottom: 2.01563px;"><span style="box-sizing: border-box;">20±5℃</span></p></td><td style="box-sizing: border-box;"><p style="box-sizing: border-box; margin-bottom: 1.35938px;"><span style="box-sizing: border-box;">50</span></p></td></tr><tr style="box-sizing: border-box;"><td style="box-sizing: border-box;"><p style="box-sizing: border-box; margin-bottom: 1.51563px;"><span style="box-sizing: border-box;">相對濕度</span></p></td><td style="box-sizing: border-box;"><p style="box-sizing: border-box; margin-bottom: 2.01563px;"><span style="box-sizing: border-box;">25%和75%</span></p></td><td style="box-sizing: border-box;"><p style="box-sizing: border-box; margin-bottom: 1.35938px;"><span style="box-sizing: border-box;">30</span></p></td></tr><tr style="box-sizing: border-box;"><td style="box-sizing: border-box;"><p style="box-sizing: border-box; margin-bottom: 1.51563px;"><span style="box-sizing: border-box;">直流共模電壓</span></p></td><td style="box-sizing: border-box;"><p style="box-sizing: border-box; margin-bottom: 2.01563px;"><span style="box-sizing: border-box;">±10V ②</span></p></td><td style="box-sizing: border-box;"><p style="box-sizing: border-box; margin-bottom: 1.35938px;"><span style="box-sizing: border-box;">50</span></p></td></tr></tbody></table></div><p><br/></p><p><span style="box-sizing: border-box; color: rgb(102, 102, 102); font-family: 微軟雅黑; background-color: rgb(255, 255, 255); text-align: center;">注：①以允許基本誤差的百分?jǐn)?shù)表示。</span><span style="color: rgb(102, 102, 102); font-family: 微軟雅黑; background-color: rgb(255, 255, 255);"></span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> ②外電路電阻（從施加被測量的兩個(gè)端鈕之間看過去的電阻）應(yīng)不超過10KΩ。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 2.6高壓試驗(yàn)</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 在環(huán)境溫度15～35℃，相對濕度45%～75%范圍內(nèi)，電位差計(jì)的導(dǎo)電部分和外殼間的絕緣強(qiáng)度，應(yīng)能耐受頻率介于45～65HZ之間，實(shí)際正弦波試驗(yàn)電壓2KV（平方根值），歷時(shí)1分鐘的試驗(yàn)而不擊穿。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 2.7絕緣電阻。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 在環(huán)境溫度15～35℃，相對濕度45%～75%范圍內(nèi)，電位差計(jì)的電路與外殼間的絕緣電阻不小于1GΩ。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 2.8外型尺寸：477×257×170mm</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;"> 2.9質(zhì) 量：7.5Kg</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;">成套性（用戶自配）</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;">1. AC15/2型檢流計(jì)或與AC24型光電放大檢流計(jì)配套</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;">2. YJ42型精密穩(wěn)壓電源或R40甲電池</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;">3. FJ51型或FJ56型直流分壓箱</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10.3594px; color: rgb(102, 102, 102); font-family: 微軟雅黑; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box;">4. 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