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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> <script type="text/javascript" src="/Skins/106676/js/jquery.lightSlider.js"></script>  <div id="yq00aqiue" class="ncontent w_1100" > <div id="yq00aqiue" class="h-6">產(chǎn)品中心<span>您當前的位置：<a href="/">首頁</a> > <a href="/products.html" >產(chǎn)品中心</a> > <a href="/ParentList-1334069.html">電氣儀表裝置</a> > <a href="/SonList-1338682.html">數(shù)字式絕緣電阻測量儀</a> > PC57直流電阻測量儀 </span></div> <div id="yq00aqiue" class="n-8 c-product">  <div id="yq00aqiue" class="n-top">  <div id="yq00aqiue" class="nn-top"> <ul class="xqytp"> <li data-thumb="http://img54.chem17.com/gxhpic_884f2b1889/f4ab28128bc76c9f5ec1a95a8f322aa82ad96f473299a1ea8263ef96ef36de7842709d37a71a110b.jpg" class="proimg_bk"><a class="proimg"><img src="http://img54.chem17.com/gxhpic_884f2b1889/f4ab28128bc76c9f5ec1a95a8f322aa82ad96f473299a1ea8263ef96ef36de7842709d37a71a110b.jpg" /></a></li> </ul> </div> <script type="text/javascript"> $(document).ready(function() { $('.gallery').lightSlider({ gallery:true, minSlide:1, maxSlide:1, currentPagerPosition:'left' }); }); </script> <div id="yq00aqiue" class="clear"></div> </div>  <div id="yq00aqiue" class="x-1"> <div id="yq00aqiue" class="b-1">基礎信息<span>Product information</span></div> <div id="yq00aqiue" class="proshowname">產(chǎn)品名稱：<h1>PC57直流電阻測量儀</h1></div> <p>產(chǎn)品型號：</p> <p>廠商性質(zhì)：生產(chǎn)廠家</p> <p>所在地：上海市</p> <p>更新時間：2025-03-21</p> <p>產(chǎn)品簡介：</p> <p><p> <div id="yq00aqiue" class="desc">PC57直流電阻測量儀是電線電纜導體直流電阻測量的儀表，儀表的技術(shù)性能應能全面滿足GB/T3048.4導體直流電阻試驗中對測量設備的各項技術(shù)要求，本儀表創(chuàng)新開發(fā)了多項新技術(shù)并已獲得了國家，測量快速、準確、讀數(shù)穩(wěn)定、使用方便。是QJ57等雙臂電橋的更新?lián)Q代產(chǎn)品，與同類的數(shù)字式微歐計相比，本儀表有以下特點</div> </p></p> </div>  <div id="yq00aqiue" class="x-1"> <div id="yq00aqiue" class="b-1">產(chǎn)品特性<span>Product characteristics</span></div> <link type="text/css" rel="stylesheet" href="/css/property.css"> <script> window.onload=function(){ changeTableHeight(); } window.onresize=function(){ changeTableHeight(); } function changeTableHeight(){ $(".proshowParameter table th").each(function?(i,o){ ????var $this=$(o),? ????height=$this.next().height(); ????$(this).css("height",height); var obj = $(o); var val = obj.text(); if(val == '' || val == null || val == undefined){ $(this).addClass('none'); }else{ $(this).removeClass('none'); } }); $(".proshowParameter table td").each(function?(i,o){ var obj = $(o); var val = obj.text(); if(val == '' || val == null || val == undefined){ $(this).addClass('none'); }else{ $(this).removeClass('none'); } }); } </script> <section class="proshowParameter"> <table style=" margin-bottom:20px;"> <tbody> <tr><th>產(chǎn)地類別</th><td>進口</td> <th></th><td></td></tr> </tbody> </table> </section><p> <span style="font-size:16px"> <span style="font-family:幼圓">PC</span><span style="font-family:times new roman">57</span><span style="font-family:幼圓">直流電阻測量儀是電線電纜導體直流電阻測量的儀表，儀表的技術(shù)性能應能全面滿足</span><strong><span style="font-family:幼圓">GB/T3048.4導體直流電阻試驗 </span></strong><span style="font-family:幼圓">中對測量設備的各項技術(shù)要求，本儀表創(chuàng)新開發(fā)了多項新技術(shù)并</span><strong><span style="font-family:幼圓">已獲得了國家</span></strong><span style="font-family:幼圓">，測量快速、準確、讀數(shù)穩(wěn)定、使用方便。是QJ57等雙臂電橋的更新?lián)Q代產(chǎn)品，與同類的數(shù)字式微歐計相比，本儀表有以下特點：</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"><img alt="" data-bd-imgshare-binded="1" src="https://img58.chem17.com/gxhpic_884f2b1889/8767c18f8ab5b16d98f040cf9bbc517ea3866cd3b058c03bf718a24b777c9ebdbff90a2b761e308d.jpg" style="height:552px; width:800px" /></span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">1.1 </span><strong><span style="font-family:幼圓">高靈敏度與高分辨力</span></strong><span style="font-family:幼圓">。本儀表2mΩ檔，該量程的分辨力為0. 1μΩ（10</span><sup><span style="font-family:幼圓">-7</span></sup><span style="font-family:幼圓">Ω），比現(xiàn)有的zui大測量電流為1A的數(shù)字式微歐計的zui高分辨力提高了10倍。本儀器采用技術(shù)特制了高靈敏、低噪聲的納伏放大器，其電壓靈敏度為100</span><span style="font-family:times new roman">nV (0.1</span><span style="font-family:幼圓">μ</span><span style="font-family:times new roman">V)</span><span style="font-family:幼圓">，測100</span><span style="font-family:times new roman">mm</span><sup><span style="font-family:times new roman">2</span></sup><span style="font-family:幼圓">截面1米銅線，保證有4位有效讀數(shù)，特別適用于較大截面導線與超小截面微細導線的測量。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">1.2</span><strong><span style="font-family:幼圓">多電流測量功能</span></strong><span style="font-family:幼圓">。本儀器的各個量程設置了不同的測量電流可供選擇，并在儀表面板上標明。該性能克服了目前數(shù)字表及某些電橋（如QJ57）測量電流不能調(diào)節(jié)，而且在某些檔位電流偏大引起被測導體發(fā)熱的缺陷。為了實現(xiàn)多電流測量，儀表采用了創(chuàng)新的數(shù)字比例式測量電路，其工作原理與電橋相仿。與目前數(shù)字式微歐計常用的恒流源</span><span style="font-family:times new roman">—</span><span style="font-family:幼圓">電壓表方式不同，本儀表讀數(shù)的zui終表達式與測量電流無關(guān)，大大降低了對恒流源的精度要求，同時提高了儀表測量的準確度和穩(wěn)定性。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:times new roman">1.3</span></strong><strong><span style="font-family:幼圓">反向電流測量功能</span></strong><span style="font-family:幼圓">。根據(jù)GB/T 3048.5第5.5條規(guī)定，當試樣電阻小于0.1Ω時，應將電流反向再測一次，然后取算術(shù)平均值。在電橋法中，該功能是通過切換外部換向閘刀實現(xiàn)的，而通常數(shù)字式微歐計是不容許電流反向的，無法實現(xiàn)標準要求的操作。本儀器中采用特殊設計的雙向電流保護電路(技術(shù))，允許進行反向電流測量，通過面板開關(guān)實施電流換向操作，操作簡捷、使用方便。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:times new roman">1.4 </span></strong><strong><span style="font-family:幼圓">交直流兩用，使用方便。</span></strong><span style="font-family:幼圓">本儀器（PC57）為便攜式結(jié)構(gòu)，在車間現(xiàn)場或野外測量成盤電纜時，可用機內(nèi)電池供電，不用接電源線，操作特別方便；在試驗室等固定場合，則可使用外接電源，用交流電源供電，減少電池消耗。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">1.5性能價格比高，適用范圍廣 </span></strong><span style="font-family:幼圓"> 本儀器在實現(xiàn)上述多功能及高性能的同時, 其價格僅為相同技術(shù)指標（0. 1μΩ分辨力，0.05級測量準確度）的同類數(shù)字式低阻計的幾分之一, 是目前市場上的低阻測量儀表，特別適合中、小電線電纜廠、漆包線生產(chǎn)廠用于導體電阻試驗，作為QJ23、QJ44、QJ57等各種電橋的更新?lián)Q代產(chǎn)品，本儀器同時適用于電力部門快速測量大型變壓器、發(fā)電機、電動機的直流電阻，開關(guān)接觸電阻，精密測量、檢定各類分流器。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓"> 1 </span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓"> 2基本參數(shù) </span></strong></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">儀表的基本參數(shù)見表1</span></span></p><p><span style="font-size:16px"> <strong><span style="font-family:幼圓">表1 基本參數(shù)</span></strong></span></p><table style="border-collapse:collapse; margin-left:-3.6pt; width:677px"><tbody><tr><td rowspan="2" style="width: 117px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 參數(shù)名稱</span></span></p></td><td colspan="2" style="width: 560px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 型號</span></span></p></td></tr><tr><td style="width: 291px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> <span style="color:rgb(255, 0, 0)"><strong> PC57</strong></span></span></span></p></td><td style="width: 269px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> <span style="color:rgb(255, 0, 0)"> PC57A</span></span></span></p></td></tr><tr><td style="width: 117px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 測量范圍</span></span></p></td><td colspan="2" style="width: 560px; vertical-align: top;"><p><span style="font-size:16px"> <span style="color:rgb(255, 0, 0)"><strong> <span style="font-family:times new roman">0. 1</span><span style="font-family:幼圓">μΩ</span><span style="font-family:times new roman">-1999.9</span><span style="font-family:幼圓">Ω</span></strong></span></span></p></td></tr><tr><td style="width: 117px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 額定測量電流 </span></span></p></td><td colspan="2" style="width: 560px; vertical-align: top;"><p><span style="font-size:16px"> <span style="color:rgb(255, 160, 122)"><span style="font-family:幼圓"> <strong> 0.1</strong></span><span style="font-family:times new roman"><strong>mA-1A </strong> </span></span></span></p></td></tr><tr><td style="width: 117px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 雙向電流測量</span></span></p></td><td colspan="2" style="width: 560px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 內(nèi)附電流換向裝置，可進行正、反向電流測量</span></span></p></td></tr><tr><td style="width: 117px; vertical-align: top;"><p><span style="font-size:16px"> <span style="font-family:幼圓"> 顯示</span></span></p></td><td colspan="2" style="width: 560px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> <span style="color:rgb(255, 0, 0)"><strong> 4 1/2 位數(shù)字顯示，字高3</strong></span></span><span style="color:rgb(255, 0, 0)"><strong><span style="font-family:times new roman">5mm，</span><span style="font-family:幼圓">量程顯示，單位顯示，帶背光</span></strong></span></span></p></td></tr><tr><td style="width: 117px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 準確度等級</span></span></p></td><td colspan="2" style="width: 560px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> <strong><span style="color:rgb(255, 0, 0)">0.05級、0.1級</span></strong></span></span></p></td></tr><tr><td style="width: 117px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 電源</span></span></p></td><td style="width: 291px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 1號電池8節(jié)或AC220V（外接電源）</span></span></p></td><td style="width: 269px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> AC220V</span></span></p></td></tr><tr><td style="width: 117px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> zui大功耗</span></span></p></td><td style="width: 291px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> <strong><span style="color:rgb(255, 0, 0)"> DC：12V 300mA；AC：5VA</span></strong></span></span></p></td><td style="width: 269px; vertical-align: top;"><p style="margin-left: 2.1pt;"><span style="font-size:16px"><strong><span style="color:rgb(255, 0, 0)"><span style="font-family:幼圓"> 7VA</span></span></strong></span></p></td></tr><tr><td style="width: 117px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 體積、重量</span></span></p></td><td style="width: 291px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> <span style="color:rgb(255, 0, 0)"><strong> 270×115×250mm（W×H×D）；2.5kg</strong></span></span></span></p></td><td style="width: 269px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 面板安裝式儀表，用戶尺寸 </span></span></p></td></tr></tbody></table><p><span style="font-size:16px"><strong><span style="font-family:幼圓">3技術(shù)要求 </span></strong></span></p><ul style="list-style-type: square;"><li><span style="font-size:16px"><span style="font-family:幼圓"> 儀器使用環(huán)境條件 </span></span></li></ul><p><span style="font-size:16px"><span style="font-family:幼圓">3.1.1 環(huán)境溫度: a）標稱工作溫度：15-25℃</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> b）正常工作溫度：5-35℃</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.1.2 相對濕度不大于85%</span> <span style="font-family:幼圓">RH</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.1.3 電源: DC：8.5</span><span style="font-family:times new roman">—</span><span style="font-family:幼圓">12.5V</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> AC: 220V±10%, 50H</span><span style="font-family:times new roman">z</span><span style="font-family:幼圓">±2H</span><span style="font-family:times new roman">z</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.1.4 除地磁場外，無電脈沖電火花等電磁場</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.2 基本誤差</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 在標稱溫度（15-25℃）下，儀表各量程的基本誤差見表2</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓"> 表2 基本誤差</span></strong></span></p><table style="border-collapse:collapse; margin-left:-3.6pt; width:672px"><tbody><tr><td style="width: 222px; vertical-align: top;"><p><span style="font-size:16px"> <span style="font-family:幼圓"> 量程</span></span></p></td><td style="width: 450px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 基本誤差</span></span></p></td></tr><tr><td style="width: 222px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> <strong><span style="color:rgb(255, 0, 0)"> 2</span></strong></span><strong><span style="color:rgb(255, 0, 0)"><span style="font-family:times new roman">m</span><span style="font-family:幼圓">Ω-20</span><span style="font-family:times new roman">m</span><span style="font-family:幼圓">Ω</span></span></strong></span></p></td><td style="width: 450px; vertical-align: top;"><p><span style="font-size:16px"><strong><span style="color:rgb(255, 0, 0)"> <span style="font-family:幼圓"> ±(0.0</span><span style="font-family:times new roman">8</span><span style="font-family:幼圓">%</span><em><span style="font-family:times new roman">R</span></em><em><sub><span style="font-family:times new roman">X</span></sub></em><span style="font-family:times new roman">+0.02</span><span style="font-family:幼圓">%</span><em><span style="font-family:times new roman">R</span></em><em><sub><span style="font-family:times new roman">m</span></sub></em><span style="font-family:幼圓">)</span></span></strong></span></p></td></tr><tr><td style="width: 222px; vertical-align: top;"><p><span style="font-size:16px"><strong><span style="color:rgb(255, 0, 0)"><span style="font-family:幼圓"> 200</span><span style="font-family:times new roman">m</span><span style="font-family:幼圓">Ω-2000Ω</span></span></strong></span></p></td><td style="width: 450px; vertical-align: top;"><p><span style="font-size:16px"><strong><span style="color:rgb(255, 0, 0)"> <span style="font-family:幼圓">±(0.04%</span><em><span style="font-family:times new roman">R</span></em><em><sub><span style="font-family:times new roman">X</span></sub></em><span style="font-family:times new roman">+0.0</span><span style="font-family:幼圓">1%</span><em><span style="font-family:times new roman">R</span></em><em><sub><span style="font-family:times new roman">m</span></sub></em></span></strong><span style="font-family:幼圓">)</span></span></p></td></tr></tbody></table><p><span style="font-size:16px"><span style="font-family:幼圓">其中</span><em><span style="font-family:times new roman">R</span></em><em><sub><span style="font-family:times new roman">X</span></sub></em><span style="font-family:幼圓">：儀表讀數(shù)值（電阻示值）</span> <em><span style="font-family:times new roman">R</span></em><em><sub><span style="font-family:times new roman">m</span></sub></em><span style="font-family:幼圓">：所測量程滿度值</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.3 準確度等級</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 在標稱溫度（15-25℃）下，儀表各量程的準確度等級及zui大允許誤差見表3</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">當環(huán)境溫度為0-40℃范圍時,儀表的準確度降低一個等級。</span> </span></p><p><span style="font-size:16px"> </span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 2</span> </span></p><p><span style="font-size:16px"> <strong><span style="font-family:幼圓">表3 準確度等級與zui大允許誤差</span></strong></span></p><table style="border-collapse:collapse; margin-left:23.4pt; width:624px"><tbody><tr><td style="width: 180px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 量程</span></span></p></td><td style="width: 216px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 準確度等級</span></span></p></td><td style="width: 228px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> zui大允許誤差</span></span></p></td></tr><tr><td style="width: 180px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 2</span><span style="font-family:times new roman">m</span><span style="font-family:幼圓">Ω-20</span><span style="font-family:times new roman">m</span><span style="font-family:幼圓">Ω</span></span></p></td><td style="width: 216px; vertical-align: top;"><p><span style="font-size:16px"> <span style="font-family:times new roman">0.</span><span style="font-family:幼圓">1</span></span></p></td><td style="width: 228px; vertical-align: top;"><p><span style="font-size:16px"> <span style="font-family:幼圓">±0.1%</span></span></p></td></tr><tr><td style="width: 180px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 200</span><span style="font-family:times new roman">m</span><span style="font-family:幼圓">Ω-2000Ω</span></span></p></td><td style="width: 216px; vertical-align: top;"><p><span style="font-size:16px"> <span style="font-family:times new roman">0.</span><span style="font-family:幼圓">05</span></span></p></td><td style="width: 228px; vertical-align: top;"><p><span style="font-size:16px"> <span style="font-family:幼圓">±0.05%</span></span></p></td></tr></tbody></table><p><span style="font-size:16px"><span style="font-family:幼圓">3.4 額定電流</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 儀表各測量檔位的額定電流標稱值見表4。</span></span></p><p><span style="font-size:16px"> <strong><span style="font-family:幼圓"> 表4 額定電流標稱值</span></strong></span></p><table style="border-collapse:collapse; margin-left:22.9pt; width:625px"><tbody><tr><td rowspan="2" style="width: 190px; vertical-align: top;"><p><span style="font-size:16px"> </span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 量程</span></span></p></td><td colspan="2" style="width: 435px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 測量狀態(tài)</span></span></p></td></tr><tr><td style="width: 207px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 常規(guī)電流（THI）</span></span></p></td><td style="width: 228px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 低電流（TLO）</span></span></p></td></tr><tr><td style="width: 190px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 2</span><span style="font-family:times new roman">m</span><span style="font-family:幼圓">Ω</span></span></p></td><td style="width: 207px; vertical-align: top;"><p><span style="font-size:16px"> <strong><span style="font-family:幼圓">————</span></strong> </span></p></td><td style="width: 228px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 1A</span></span></p></td></tr><tr><td style="width: 190px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 20</span><span style="font-family:times new roman">m</span><span style="font-family:幼圓">Ω</span></span></p></td><td style="width: 207px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 1A</span></span></p></td><td style="width: 228px; vertical-align: top;"><p><span style="font-size:16px"> <strong><span style="font-family:幼圓">————</span></strong> </span></p></td></tr><tr><td style="width: 190px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 200</span><span style="font-family:times new roman">m</span><span style="font-family:幼圓">Ω</span></span></p></td><td style="width: 207px; vertical-align: top;"><p><span style="font-size:16px"> <strong><span style="font-family:幼圓">————</span></strong> </span></p></td><td style="width: 228px; vertical-align: top;"><p><span style="font-size:16px"> <span style="font-family:times new roman">100mA</span> </span></p></td></tr><tr><td style="width: 190px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 2Ω</span></span></p></td><td style="width: 207px; vertical-align: top;"><p><span style="font-size:16px"> <span style="font-family:times new roman">100mA</span></span></p></td><td style="width: 228px; vertical-align: top;"><p><span style="font-size:16px"> <span style="font-family:times new roman">10mA</span></span></p></td></tr><tr><td style="width: 190px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 20Ω</span></span></p></td><td style="width: 207px; vertical-align: top;"><p><span style="font-size:16px"> <span style="font-family:times new roman">10mA</span></span></p></td><td style="width: 228px; vertical-align: top;"><p><span style="font-size:16px"> <span style="font-family:times new roman">1mA</span></span></p></td></tr><tr><td style="width: 190px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 200Ω</span></span></p></td><td style="width: 207px; vertical-align: top;"><p><span style="font-size:16px"> <span style="font-family:times new roman">1mA</span></span></p></td><td style="width: 228px; vertical-align: top;"><p><span style="font-size:16px"> <span style="font-family:times new roman">100</span><span style="font-family:幼圓">μ</span><span style="font-family:times new roman">A</span></span></p></td></tr><tr><td style="width: 190px; vertical-align: top;"><p><span style="font-size:16px"><span style="font-family:幼圓"> 2000Ω</span></span></p></td><td style="width: 207px; vertical-align: top;"><p><span style="font-size:16px"> <span style="font-family:times new roman">100</span><span style="font-family:幼圓">μ</span><span style="font-family:times new roman">A</span></span></p></td><td style="width: 228px; vertical-align: top;"><p><span style="font-size:16px"> <strong><span style="font-family:幼圓">————</span></strong></span></p></td></tr></tbody></table><p><span style="font-size:16px"><span style="font-family:幼圓">3.5雙向電流測量</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">在消除了測量回路的熱電勢偏差后，儀表在正向電流下的測量結(jié)果與反向電流下的測量結(jié)果的相差值，不超過儀表基本誤差的1/2。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.6 電池低電壓指示 (僅PC57)</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 當電池電壓低于8.5±0.3V時, 儀表面板上的電池低電壓告警紅色指示燈亮，提示用戶更換電池或改用外接電源操作，此時儀表仍為正常工作狀態(tài)，測量結(jié)果有效。如果繼續(xù)使用機內(nèi)電池，當電池電壓低于儀表正常工作范圍時，儀表顯示屏上的背光照明自動熄滅，此時，測量結(jié)果無效。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.6 絕緣電阻</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">交流電源輸入端與機殼接地端及儀表測量端之間的絕緣電阻應不小于</span><span style="font-family:times new roman">3</span><span style="font-family:幼圓">0MΩ。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.7 工頻耐壓</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">交流電源輸入端與機殼接地端及儀表測量端之間應承受45H</span><span style="font-family:times new roman">z</span><span style="font-family:幼圓">-65H</span><span style="font-family:times new roman">z</span><span style="font-family:幼圓">任意頻率下，實際正弦交流電壓1.5</span><span style="font-family:times new roman">kV</span><span style="font-family:幼圓">歷時1</span><span style="font-family:times new roman">min</span><span style="font-family:幼圓">試驗，無擊穿或飛弧現(xiàn)象。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">4 使用方法及注意事項 </span></strong></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 3 </span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">4.1面板功能介紹</span></span></p><p><span style="font-size:16px"><img alt="" data-bd-imgshare-binded="1" src="https://img58.chem17.com/gxhpic_884f2b1889/8767c18f8ab5b16d98f040cf9bbc517e747c856b69ee2b1a75b80664fd3e1668e1f5df2fb4b35129.png" style="height:260px; width:420px" /></span></p><p><span style="font-size:16px"> </span></p><p style="text-align: center;"><span style="font-size:16px"> </span></p><p><span style="font-size:16px"><span style="font-family:幼圓">其中</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">（1）─液晶顯示屏</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">（2）─量程選擇開關(guān)</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">（3）─校零、平衡旋鈕 </span> </span></p><p><span style="font-size:16px"><span style="font-family:幼圓">（4）─外接電源插口（僅PC57）</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">（5）─電源開關(guān)</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">（6）─電池低電壓告警指示燈（僅PC57）</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">（7）─讀數(shù)保持開關(guān)</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">（8）─測量電流正、反向選擇開關(guān)</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">（9）─校零、平衡、測量選擇開關(guān)</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">（10）─電流輸出C1端（接測量導線：紅色粗線）</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">（11）─電壓輸入P1端（接測量導線：紅色細線）</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">（</span><span style="font-family:times new roman">1</span><span style="font-family:幼圓">2）─電壓輸入P2端（接測量導線：黑色細線）</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">（</span><span style="font-family:times new roman">1</span><span style="font-family:幼圓">3）─電流輸出C2端（接測量導線：黑色粗線）</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">4.2 電阻測量步驟</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">4.2.1 電源選擇（僅PC57）直流電源：打開電池盒蓋板（儀器后面板），按電池盒蓋板指示的極性裝入電壓為1.2</span><span style="font-family:times new roman">—</span><span style="font-family:幼圓">1.5V, R20（1號）電池8節(jié)，推薦優(yōu)先使用電池品種順序依次為：可充電鎳氫電池，高性能堿性電池，鐵殼普通電池。如使用紙殼電池，則應充分注意電池狀況，以免電池漏夜腐蝕儀器。交流電源：將儀器所附的外接電源的低壓輸出插頭插入儀器的外接電源插口（4），然后將高壓端插入220V電源。外接電源低壓輸出插頭的前端（球面）為正極，后端為負極。 </span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 4</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">4.2.2儀器預熱及內(nèi)部校零：將校零、平衡、測量選擇開關(guān)(9)撥至“校零”位置， </span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">打開電源開關(guān)（5），通電預熱3分鐘后，調(diào)節(jié)校零、平衡旋鈕（3），使儀器示值</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">為0000。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">4.2</span><span style="font-family:times new roman">.</span><span style="font-family:幼圓">3按C1、P1、P2、C2的順序連接被測器件，電流端在外側(cè)、電壓端在內(nèi)側(cè)，</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">紅色粗線為C1、細線為P1；黑色粗線為C2、細線為P2。由于本儀器具有*的測量靈敏度，在連接P1、P2端時應盡量避免人體接觸，以免人體加熱電壓結(jié)點，引起熱電偶效應，由此產(chǎn)生的熱電勢將會對電阻的測量造成影響。</span></span></p><p><span style="font-size:16px"><span style="font-family:times new roman">1m</span><span style="font-family:幼圓">長度的導體電阻測量必須與的導體電阻測量夾具配合使用，Φ8mm以下電線可選用DQ-150型導體電阻測量夾具，Φ20mm以下電纜可選用DQ-240型，Φ1mm以上至Φ38mm電纜可選用DQ-630型，鉗口端接C1、C2，刀口端接P1、P2。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">成盤電纜直流電阻測量必須與的導體直流電阻測試鉗配合使用，Φ32mm以下電纜可選用本廠特制的中型導體電阻測試鉗，Φ41mm以下電纜可選用本廠特制的大型導體電阻測試鉗，對于通常的測試要求，使用一對（紅、黑）測試鉗即可，紅鉗與黑鉗分別夾在被測電纜兩端，紅鉗的兩根紅線分別接C1、P1，黑鉗的兩根黑線分別接C2、P2。如果對測量準確度要求很高或被測電纜直徑很大時（譬如大型電纜成品交割時，雙方對直流電阻指標是否合格有爭議而進行的仲裁試驗），可采用兩對導體電阻測試鉗，以消除電流端與電壓端距離過近造成測量結(jié)果可能偏大的影響。兩個紅鉗夾在被測電纜的一端，兩個鉗子之間的距離應不小于被測導體周長的1.5倍，外側(cè)紅鉗的兩根紅線并聯(lián)接C1端，內(nèi)側(cè)紅鉗的兩根紅線并聯(lián)接P1端；兩個黑鉗夾在被測電纜的另一端，外側(cè)黑鉗的兩根黑線并聯(lián)接C2端，內(nèi)側(cè)黑鉗的兩根黑線并聯(lián)接P2端。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">4.2.4 根據(jù)被測器件的性質(zhì)及電阻值范圍，選擇合適的測量檔位，儀表在同一量程設有不同測量電流可供選擇，較大的測量電流具有抗干擾性能好的特點，此時顯示屏上出現(xiàn)“THI”字符；較低的測量電流對導體的加熱效應小，適用于微細導線的測量，此時顯示屏上出現(xiàn)“TLO”字符。如果不能估計被測器件的電阻值范圍，則應先選取較高的電阻量程及較小的測量電流，防止被測器件受到大電流沖擊。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">4.2.5 測量回路電勢平衡：將開關(guān)（9）由“校零”位撥至“平衡”位置（中間位）時，顯示屏上可能會出現(xiàn)數(shù)值，表示測量回路中存在不平衡的接觸電勢或熱電勢，再次調(diào)節(jié)調(diào)節(jié)校零、平衡旋鈕（3），使儀器示值在0000與-0000之間，可以抵消外部電勢對電阻測量的影響。應該注意：測量回路中的不平衡電勢往往是由于連接過程中人體加熱電壓結(jié)點所致，它是一個不穩(wěn)定的數(shù)值，將隨著溫度平衡而緩慢消退，如顯示屏上的讀數(shù)較大，測量者應靜待片刻，等到顯示屏上的讀數(shù)降至5</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 5</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">個字以下，再進行調(diào)節(jié)平衡的操作，如果儀表在“平衡”位置上讀數(shù)不穩(wěn)或不能調(diào)至零位，請重點檢查P1、P2電位端是否接妥。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">4.2.6 電阻值測量：將開關(guān)（9）由“平衡”撥至“測量”位置，測量電流通過被測器件，顯示屏上出現(xiàn)的數(shù)值即為被測電阻值。如果顯示屏出現(xiàn)“1</span><span style="font-family:times new roman">—</span><span style="font-family:幼圓">”說明測量欠量程，應將量程開關(guān)（2）順時針旋轉(zhuǎn)，直至儀器出現(xiàn)示值；如讀數(shù)小于1800個字，說明測量過量程，應逆時針旋轉(zhuǎn)量程開關(guān)，以保證測量具有較高的分辨力。如量程合適，儀器示值應在1800</span><span style="font-family:times new roman">—</span><span style="font-family:幼圓">19999之間。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">4.3 讀數(shù)保持：將讀數(shù)保持開關(guān)（7）撥至“保持”位置，顯示屏上出現(xiàn)“H”</span> <span style="font-family:幼圓">字符，儀器示值鎖定，方便用戶記錄數(shù)據(jù)，如要連續(xù)測量，讀數(shù)保持開關(guān)應置于“測量”位置。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">4.4反向電流下的電阻測量：電線電纜導體直流電阻測量，如被測電阻小于0.1Ω，按國家標準的規(guī)定應進行反向電流下的電阻測量，以進一步抵消測量回路熱電勢</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">影響。將測量電流正、反向選擇開關(guān)（8）撥至“反向</span><span style="font-family:times new roman">”</span><span style="font-family:幼圓">（反向電流）位置，顯示</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">屏上電阻值的前面將出現(xiàn)負號，表示該數(shù)值是在反向電流下測得的數(shù)據(jù)，將這個</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">數(shù)據(jù)的值與“正向</span><span style="font-family:times new roman">”</span><span style="font-family:幼圓">（正向電流）下測得的數(shù)據(jù)相加后除以2，作為zui終的測量結(jié)果，與單向電流下的測量的結(jié)果相比，該數(shù)值具有更高的準確度與可靠性。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">5 注意事項</span></strong></span></p><p style="margin-right: 9pt;"><span style="font-size:16px"><span style="font-family:幼圓">5.1 本儀表是電線電纜導體電阻試驗設備，采用了很多新技術(shù)，具有一些電橋及其他數(shù)字式低阻表所不具備的性能和特點，為了能夠安全、正確地操作本儀表，使得測量工作順利進行，</span><strong><span style="font-family:幼圓">用戶在使用前務必仔細閱讀本使用說明書</span></strong><span style="font-family:幼圓">。</span></span></p><ul style="list-style-type: square;"><li><span style="font-size:16px"><span style="font-family:幼圓">在進行電線電纜導體直流電阻測量時, 必須盡可能保證環(huán)境溫度在15-25℃范</span></span></li></ul><p style="margin-right: 9pt;"><span style="font-size:16px"><span style="font-family:幼圓">圍內(nèi)，儀表保證表3所示的測量準確度，在5-35℃環(huán)境溫度下，儀表可以正常工作，但測量準確度降低一個等級。由于被測銅、鋁導線具有很高的溫度系數(shù)，在測量時應嚴格保持室內(nèi)溫度的均勻與恒定，避免陽光直照或空調(diào)風直吹，室溫調(diào)節(jié)推薦采用中央空調(diào)或變頻式空調(diào)，zui大限度減少室內(nèi)溫度的波動。測溫器件應采用分辨力不低于0.1℃的精密溫度計，并安裝在盡可能靠近被測導體的位置上。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">5.3 </span><strong><span style="font-family:幼圓">在C1、C2、P1、P2端懸空時，開關(guān)（9）必須置于“校零”檔位，測量結(jié)束時應先將開關(guān)(6)撥至“校零”位置，斷開測量電流，然后斷開被測器件，應避免在大電流測量狀態(tài)下將負載開路，儀表不用時也請將開關(guān)(9)撥至“校零”位置。</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">5.4 在使用電池供電時, 如出現(xiàn)顯示屏背光突然熄滅的情況（較易出現(xiàn)在測量電流為1A的情況下），說明電池電壓過低，必須更換電池或改用外接電源供電。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">5.5 儀器使用時，其通風孔及外接電源不得遮蓋，以保證散熱良好。測試場合必須避開干擾源，如手電鉆、電焊機、大功率接觸器等。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 6</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">5.6 儀器不用時，應存放在通風、干燥的環(huán)境下，避免嚴寒與高溫。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">6 執(zhí)行標準及制造保證</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">6.1 本儀表執(zhí)行標準為上海市企業(yè)標準</span><span style="font-family:times new roman">Q/AEXJ4</span><span style="font-family:幼圓">。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">6.2制造保證：用戶在按本使用說明書規(guī)定的使用條件使用或操作本儀表, 自購貨日起12個月內(nèi)，屬因制造不良而損壞或不能正常運行，本廠負責為用戶免費修理或調(diào)換。本儀表實行終身維修。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">7 儀器的成套性</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 隨同每臺儀器提供下列技術(shù)文件與附件：</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 產(chǎn)品合格證書 1份使用說明書 1份</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 電源線 1根測量導線 1付</span></span></p><p><span style="font-size:16px"> <span style="font-family:幼圓">PC57外接電源 1個（僅PC57）</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 選購件：</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 1．DQ-150導體電阻測量夾具（Φ0</span><span style="font-family:times new roman">—</span><span style="font-family:幼圓">Φ8mm）</span></span></p><table style="border-collapse:collapse; margin-left:-5.1pt; width:698px"><tbody><tr><td style="width: 698px; vertical-align: top;"><p style="margin-left: 5.1pt;"><span style="font-size:16px"> <span style="font-family:幼圓"> 2．DQ-240導體電阻測量夾具（Φ0</span><span style="font-family:times new roman">—</span><span style="font-family:幼圓">Φ20mm）</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 3．DQ-630導體電阻測量夾具（Φ1</span><span style="font-family:times new roman">—</span><span style="font-family:幼圓">Φ38mm）</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 4．成盤電纜直流電阻測試鉗（中型Φ0</span><span style="font-family:times new roman">—</span><span style="font-family:幼圓">Φ32mm）</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 5．成盤電纜直流電阻測試鉗（大型Φ8</span><span style="font-family:times new roman">—</span><span style="font-family:幼圓">Φ41mm）</span></span></p><p><span style="font-size:16px"> </span></p></td></tr></tbody></table> </div> <link rel="stylesheet" type="text/css" href="/css/MessageBoard_style.css"> <script language="javascript" src="/skins/Scripts/order.js?v=20210318" type="text/javascript"></script> <a name="order" id="order"></a> <div id="yq00aqiue" class="ly_msg" id="ly_msg"> <form method="post" name="form2" id="form2"> <h3>留言框 </h3> <ul> <li> <h4 class="xh">產(chǎn)品：</h4> <div id="yq00aqiue" class="msg_ipt1"><input class="textborder" size="30" name="Product" id="Product" value="PC57直流電阻測量儀" placeholder="請輸入產(chǎn)品名稱" /></div> </li> <li> <h4>您的單位：</h4> <div id="yq00aqiue" class="msg_ipt12"><input class="textborder" size="42" name="department" 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