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style="font-family:幼圓">中對測量設(shè)備的各項(xiàng)技術(shù)要求，測量快速、準(zhǔn)確、讀數(shù)穩(wěn)定、使用方便。是QJ57、QJ36電橋的更新?lián)Q代產(chǎn)品，與同類數(shù)字式微歐計(jì)相比，本儀表有以下特點(diǎn)：</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">1.1 較高的測量靈敏度與分辨力。</span></strong><span style="font-family:幼圓">200μΩ檔量程的高分辨力為0.01μΩ（10</span><sup><span style="font-family:幼圓">-8</span></sup><span style="font-family:幼圓">Ω），比現(xiàn)有的數(shù)字式微歐計(jì)的高分辨力提高了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">，該項(xiàng)指標(biāo)已經(jīng)達(dá)到了6 1/2位數(shù)字電壓表的技術(shù)水平。儀器在“低電流TLO”測量狀態(tài)（低測量電流、高靈敏度）具有*的測量靈敏度與分辨力，用10A電流測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，有5位有效讀數(shù)，測1000</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，也保證有4位有效讀數(shù)，比現(xiàn)有的數(shù)字式低阻表提高了一個(gè)數(shù)量級，特別適用于超大截面導(dǎo)線與超小截面微細(xì)導(dǎo)線的測量。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">1.2多電流測量功能。</span></strong><span style="font-family:幼圓">本儀器的各個(gè)量程設(shè)置了不同的測量電流可供選擇，并在儀表面板上標(biāo)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(dǎo)體發(fā)熱的缺陷。為了實(shí)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(jì)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)的終表達(dá)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(shí)提高了儀表測量的準(zhǔn)確度和穩(wěn)定性。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">1.3倍率電流測量功能。</span></strong><span style="font-family:幼圓">為了方便用戶實(shí)施GB/T 3048.4第5.6條中用比例為1：1.41的兩個(gè)測量電流分別測試樣電阻值，以判定是否發(fā)生溫升超標(biāo)的方法，本儀表設(shè)置有比例為0.707：1.00：1.41三檔電流可供切換，避免了為了降低測量電流而改變量程檔位, 造成測量精度及分辨力的損失。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">1.4外部熱電勢平衡功能。</span></strong><span style="font-family:幼圓">為了降低電位端的外部接觸電勢與熱電勢對測量結(jié)果的影響，本儀表設(shè)置了外部電勢平衡調(diào)節(jié)裝置，該方法是</span><strong><span style="font-family:幼圓">GB/T 3048.2 電線電纜電性能試驗(yàn)方法金屬導(dǎo)體材料電阻率試驗(yàn) </span></strong><span style="font-family:幼圓">第6.5.3中推薦的方法之一。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">1.5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(dāng)試樣電阻小于0.1Ω時(shí)，應(yīng)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(shí)現(xiàn)的，而通常數(shù)字式微歐計(jì)是不容許電流反向的，無法實(shí)現(xiàn)標(biāo)準(zhǔn)要求的操作。本儀器中采用特殊設(shè)計(jì)的雙向電流保護(hù)電路，允許進(jìn)行</span> <span style="font-family:幼圓">反向電流測量，并在儀器內(nèi)部設(shè)置了大功率換向繼電器，通過面板開關(guān)實(shí)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">1.6 </span></strong><strong><span style="font-family:幼圓">銅、鋁導(dǎo)線溫度手動(dòng)校正功能（PC36C）</span></strong><span style="font-family:幼圓">。當(dāng)試驗(yàn)環(huán)境溫度在15-25℃范圍內(nèi)，通過設(shè)定</span><span style="font-family:times new roman">PC36C</span><span style="font-family:幼圓">的溫度校正開關(guān)，儀表將被測銅線或鋁線的電阻值根據(jù)</span><strong><span style="font-family:幼圓">GB/T 3048.4</span></strong><span style="font-family:幼圓">推薦的公式自動(dòng)換算到該導(dǎo)線在基準(zhǔn)溫度20℃時(shí)的電阻值。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:times new roman">1.7</span></strong><strong><span style="font-family:幼圓"> 測溫功能以及導(dǎo)體溫度自動(dòng)校正功能</span></strong><strong><span style="font-family:幼圓">（PC36E）</span></strong><span style="font-family:幼圓">。.本公司建立了以一等鉑電阻</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓"> 標(biāo)準(zhǔn)溫度計(jì)、7 1/2位高精度微歐表、穩(wěn)定性達(dá)到0.01℃的恒溫爐為基礎(chǔ)的熱工實(shí)驗(yàn)室，研制出高性能導(dǎo)體電阻測量儀表PC36E，可以準(zhǔn)確測量導(dǎo)體的真實(shí)溫度，直接顯示經(jīng)過溫度校正后，基準(zhǔn)溫度20℃時(shí)的導(dǎo)體電阻值。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">PC36E的出現(xiàn)，使導(dǎo)體電阻試驗(yàn)操作達(dá)到了簡化，實(shí)現(xiàn)電阻測量、溫度測量、溫度校正一步完成，取代傳統(tǒng)的三個(gè)操作步驟，大大節(jié)約人力物力，并具有更高的溫度校正準(zhǔn)確度。儀表提供5種常用材料的溫度系數(shù)，可以在0-40℃范圍內(nèi)進(jìn)行準(zhǔn)確的溫度校正，大大降低了導(dǎo)體電阻測量時(shí)對環(huán)境溫度控溫范圍的要求，不僅可以用于實(shí)驗(yàn)室，也可以用在車間現(xiàn)場，用電橋夾具直接測量成盤電纜上1米距離的電阻值，避免了由于切斷取樣造成金屬材料的損失和浪費(fèi)，同時(shí)也節(jié)約了時(shí)間和人力。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">1.8 高準(zhǔn)確度長期穩(wěn)定性 </span></strong><span style="font-family:幼圓">本儀表是同類儀表中準(zhǔn)確度高的，內(nèi)部的標(biāo)準(zhǔn)電阻采用精密錳銅材料，并經(jīng)過特殊的長時(shí)間老化工藝制成，具有和BZ3系列標(biāo)準(zhǔn)電阻一樣很低的溫度系數(shù)和年穩(wěn)定性。儀器的高靈敏度電位輸入端采用了低熱電勢、長壽命的復(fù)銀開關(guān)和低熱電勢的鍍金接插件，可以確保測量的準(zhǔn)確度與長期穩(wěn)定性。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">2 </span></strong><strong><span style="font-family:幼圓">基本參數(shù)</span></strong></span></p><p style="margin-left:20.2500pt"><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 border="1" cellspacing="0" style="border-collapse:collapse; border:none; margin-left:33.9000pt; width:610px"><tbody><tr><td style="vertical-align:top; width:145px"><p><span style="font-size:16px"><span style="font-family:幼圓">型號</span></span></p></td><td style="vertical-align:top; width:214px"><p><span style="font-size:16px"><span style="font-family:幼圓">PC36C </span></span></p></td><td colspan="2" style="vertical-align:top; width:252px"><p><span style="font-size:16px"><span style="font-family:幼圓"> PC36E </span> </span></p></td></tr><tr><td style="vertical-align:top; width:145px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 測量范圍</span></span></p></td><td colspan="3" style="vertical-align:top; width:466px"><p><span style="font-size:16px"><span style="font-family:幼圓">0．01</span><span style="font-family:times new roman">μ?─</span><span style="font-family:幼圓">200</span><span style="font-family:times new roman">?</span></span></p></td></tr><tr><td style="vertical-align:top; width:145px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 測量電流 </span></span></p></td><td colspan="3" style="vertical-align:top; width:466px"><p><span style="font-size:16px"> <span style="font-family:幼圓">0.707</span><span style="font-family:times new roman">mA-1</span><span style="font-family:幼圓">4.1</span><span style="font-family:times new roman">A </span></span></p></td></tr><tr><td style="vertical-align:top; width:145px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 倍率電流測量</span></span></p></td><td colspan="3" style="vertical-align:top; width:466px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 0.707I：1.00I：1.41I</span></span></p></td></tr><tr><td style="vertical-align:top; width:145px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 雙向電流測量</span></span></p></td><td colspan="3" style="vertical-align:top; width:466px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 內(nèi)附電流換向裝置，可進(jìn)行正、反向電流測量</span></span></p></td></tr><tr><td style="vertical-align:top; width:145px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 電阻溫度校正</span></span></p></td><td colspan="2" style="vertical-align:top; width:217px"><p><span style="font-size:16px"><span style="font-family:幼圓">15—25℃(人工輸入環(huán)境溫度)</span></span></p></td><td style="vertical-align:top; width:248px"><p><span style="font-size:16px"><span style="font-family:幼圓">0—40℃ (自動(dòng)測溫及溫度校正)</span></span></p></td></tr><tr><td style="vertical-align:top; width:145px"><p><span style="font-size:16px"> <span style="font-family:幼圓"> 顯示</span></span></p></td><td colspan="3" style="vertical-align:top; width:466px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 4 1/2 位數(shù)字顯示，測量結(jié)果顯示、量程顯示、單位顯示，測量功能顯示、測量狀態(tài)顯示、溫度顯示、材料溫度系數(shù)顯示、帶背光</span></span></p></td></tr><tr><td style="vertical-align:top; width:145px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 準(zhǔn)確度等級</span></span></p></td><td colspan="3" style="vertical-align:top; width:466px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 0.04級, 0.05級, 0.1級</span></span></p></td></tr><tr><td style="vertical-align:top; width:145px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 電源</span></span></p></td><td colspan="3" style="vertical-align:top; width:466px"><p><span style="font-size:16px"><span style="font-family:幼圓"> AC 220V（1±10%），50H</span><span style="font-family:times new roman">z</span><span style="font-family:幼圓">（1±</span><span style="font-family:times new roman">5%</span><span style="font-family:幼圓">)</span></span></p></td></tr><tr><td style="vertical-align:top; width:145px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 功耗</span></span></p></td><td colspan="3" style="vertical-align:top; width:466px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 80VA </span></span></p></td></tr><tr><td style="vertical-align:top; width:145px"><p><span style="font-size:16px"> <span style="font-family:幼圓">外形尺寸</span></span></p></td><td colspan="3" style="vertical-align:top; width:466px"><p><span style="font-size:16px"><span style="font-family:times new roman">360</span><span style="font-family:幼圓">×</span><span style="font-family:times new roman">133</span><span style="font-family:幼圓">×</span><span style="font-family:times new roman">400</span><span style="font-family:幼圓">（W×H×D），</span><span style="font-family:times new roman">mm</span></span></p></td></tr><tr><td style="vertical-align:top; width:145px"><p><span style="font-size:16px"> <span style="font-family:幼圓">質(zhì)量（重量）</span></span></p></td><td colspan="3" style="vertical-align:top; width:466px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 12</span><span style="font-family:times new roman"> kg</span></span></p></td></tr></tbody></table><p style="margin-left:23.2500pt"><span style="font-size:16px"> </span></p><p style="margin-left:23.2500pt"><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">3 </span></strong><strong><span style="font-family:幼圓">技術(shù)要求 </span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">3.1</span></strong> <strong><span style="font-family:幼圓">儀器使用環(huán)境條件</span></strong> </span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.1.1 環(huán)境溫度: 0-40℃</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: 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"><strong><span style="font-family:幼圓">3.2</span></strong> <strong><span style="font-family:幼圓">電阻測量基本誤差</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">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 border="1" cellspacing="0" style="border-collapse:collapse; border:none; margin-left:22.9000pt; width:572px"><tbody><tr><td style="vertical-align:top; width:133px"><p><span style="font-size:16px"> <span style="font-family:幼圓"> 量程</span></span></p></td><td style="vertical-align:top; width:216px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 常規(guī)電流</span></span></p></td><td style="vertical-align:top; width:223px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 低電流</span></span></p></td></tr><tr><td style="vertical-align:top; width:133px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 200μΩ</span></span></p></td><td style="vertical-align:top; width:216px"><p><span style="font-size:16px"> <strong><span style="font-family:幼圓">————</span></strong></span></p></td><td style="vertical-align:top; width:223px"><p><span style="font-size:16px"> <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></p></td></tr><tr><td style="vertical-align:top; width:133px"><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="vertical-align:top; width:216px"><p><span style="font-size:16px"> <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">+0.01</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></p></td><td style="vertical-align:top; width:223px"><p><span style="font-size:16px"> <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></p></td></tr><tr><td style="vertical-align:top; width:133px"><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="vertical-align:top; width:216px"><p><span style="font-size:16px"> <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">+0.01</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></p></td><td style="vertical-align:top; width:223px"><p><span style="font-size:16px"> <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></p></td></tr><tr><td style="vertical-align:top; width:133px"><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="vertical-align:top; width:216px"><p><span style="font-size:16px"> <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">+0.01</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></p></td><td style="vertical-align:top; width:223px"><p><span style="font-size:16px"> <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">+0.01</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></p></td></tr><tr><td style="vertical-align:top; width:133px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 2Ω</span></span></p></td><td style="vertical-align:top; width:216px"><p><span style="font-size:16px"> <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">+0.01</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></p></td><td style="vertical-align:top; width:223px"><p><span style="font-size:16px"> <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">+0.01</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></p></td></tr><tr><td style="vertical-align:top; width:133px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 20Ω</span></span></p></td><td style="vertical-align:top; width:216px"><p><span style="font-size:16px"> <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">+0.01</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></p></td><td style="vertical-align:top; width:223px"><p><span style="font-size:16px"> <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">+0.01</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></p></td></tr><tr><td style="vertical-align:top; width:133px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 200Ω</span></span></p></td><td style="vertical-align:top; width:216px"><p><span style="font-size:16px"> <span style="font-family:幼圓">±(0.0</span><span style="font-family:times new roman">3</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">+0.01</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></p></td><td style="vertical-align:top; width:223px"><p><span style="font-size:16px"> <strong><span style="font-family:幼圓">————</span></strong></span></p></td></tr><tr><td colspan="3" style="vertical-align:top; width:572px"><p> </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"><strong><span style="font-family:幼圓">3.3</span></strong> <strong><span style="font-family:幼圓">電阻測量準(zhǔn)確度等級</span></strong></span></p><p style="margin-left:18.0000pt"><span style="font-size:16px"><span style="font-family:幼圓">儀表各量程的準(zhǔn)確度等級及大允許誤差見表3</span></span></p><p><span style="font-size:16px"> <strong><span style="font-family:幼圓">表3 準(zhǔn)確度等級與大允許誤差</span></strong></span></p><table border="1" cellspacing="0" style="border-collapse:collapse; border:none; margin-left:22.9000pt; width:572px"><tbody><tr><td rowspan="2" style="vertical-align:top; width:133px"><p> </p><p><span style="font-size:16px"><span style="font-family:幼圓"> 量程</span></span></p></td><td colspan="2" style="vertical-align:top; width:216px"><p><span style="font-size:16px"> <span style="font-family:幼圓">常規(guī)電流</span></span></p></td><td colspan="2" style="vertical-align:top; width:223px"><p style="margin-left:64.0500pt"><span style="font-size:16px"><span style="font-family:幼圓">低電流</span></span></p></td></tr><tr><td style="vertical-align:top; width:108px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 準(zhǔn)確度等級</span></span></p></td><td style="vertical-align:top; width:108px"><p><span style="font-size:16px"><span style="font-family:幼圓">大允許誤差</span></span></p></td><td style="vertical-align:top; width:117px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 準(zhǔn)確度等級</span></span></p></td><td style="vertical-align:top; width:107px"><p><span style="font-size:16px"><span style="font-family:幼圓">大允許誤差</span></span></p></td></tr><tr><td style="vertical-align:top; width:133px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 200μΩ</span></span></p></td><td style="vertical-align:top; width:108px"><p><span style="font-size:16px"><strong><span style="font-family:幼圓"> ————</span></strong></span></p></td><td style="vertical-align:top; width:108px"><p><span style="font-size:16px"><strong><span style="font-family:幼圓"> ————</span></strong></span></p></td><td style="vertical-align:top; width:117px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 0.1</span></span></p></td><td style="vertical-align:top; width:107px"><p><span style="font-size:16px"><span style="font-family:幼圓"> ±0.1%</span></span></p></td></tr><tr><td style="vertical-align:top; width:133px"><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="vertical-align:top; width:108px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 0.05</span></span></p></td><td style="vertical-align:top; width:108px"><p><span style="font-size:16px"><span style="font-family:幼圓"> ±0.05%</span></span></p></td><td style="vertical-align:top; width:117px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 0.1</span></span></p></td><td style="vertical-align:top; width:107px"><p><span style="font-size:16px"><span style="font-family:幼圓"> ±0.1%</span></span></p></td></tr><tr><td style="vertical-align:top; width:133px"><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="vertical-align:top; width:108px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 0.05</span></span></p></td><td style="vertical-align:top; width:108px"><p><span style="font-size:16px"> <span style="font-family:幼圓">±0.05%</span></span></p></td><td style="vertical-align:top; width:117px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 0.1</span></span></p></td><td style="vertical-align:top; width:107px"><p><span style="font-size:16px"> <span style="font-family:幼圓">±0.1%</span></span></p></td></tr><tr><td style="vertical-align:top; width:133px"><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="vertical-align:top; width:108px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 0.05</span></span></p></td><td style="vertical-align:top; width:108px"><p><span style="font-size:16px"> <span style="font-family:幼圓">±0.05%</span></span></p></td><td style="vertical-align:top; width:117px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 0.05</span></span></p></td><td style="vertical-align:top; width:107px"><p><span style="font-size:16px"> <span style="font-family:幼圓">±0.05%</span></span></p></td></tr><tr><td style="vertical-align:top; width:133px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 2Ω</span></span></p></td><td style="vertical-align:top; width:108px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 0.05</span></span></p></td><td style="vertical-align:top; width:108px"><p><span style="font-size:16px"> <span style="font-family:幼圓">±0.05%</span></span></p></td><td style="vertical-align:top; width:117px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 0.05</span></span></p></td><td style="vertical-align:top; width:107px"><p><span style="font-size:16px"> <span style="font-family:幼圓">±0.05%</span></span></p></td></tr><tr><td style="vertical-align:top; width:133px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 20Ω</span></span></p></td><td style="vertical-align:top; width:108px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 0.05</span></span></p></td><td style="vertical-align:top; width:108px"><p><span style="font-size:16px"> <span style="font-family:幼圓">±0.05%</span></span></p></td><td style="vertical-align:top; width:117px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 0.05</span></span></p></td><td style="vertical-align:top; width:107px"><p><span style="font-size:16px"> <span style="font-family:幼圓">±0.05%</span></span></p></td></tr><tr><td style="vertical-align:top; width:133px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 200Ω</span></span></p></td><td style="vertical-align:top; width:108px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 0.04</span></span></p></td><td style="vertical-align:top; width:108px"><p><span style="font-size:16px"> <span style="font-family:幼圓">±0.04%</span></span></p></td><td style="vertical-align:top; width:117px"><p><span style="font-size:16px"><strong><span style="font-family:幼圓"> ————</span></strong></span></p></td><td style="vertical-align:top; width:107px"><p><span style="font-size:16px"><strong><span style="font-family:幼圓"> ————</span></strong></span></p></td></tr></tbody></table><p> </p><p><span style="font-size:16px"><span style="font-family:times new roman"> 3</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">3.4</span></strong> <strong><span style="font-family:幼圓">額定電流</span></strong></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(biāo)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(biāo)稱值</span></strong></span></p><table border="1" cellspacing="0" style="border-collapse:collapse; border:none; margin-left:22.9000pt; width:572px"><tbody><tr><td rowspan="2" style="vertical-align:top; width:190px"><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="vertical-align:top; width:382px"><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="vertical-align:top; width:195px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 常規(guī)電流</span></span></p></td><td style="vertical-align:top; width:187px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 低電流</span></span></p></td></tr><tr><td style="vertical-align:top; width:190px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 200μΩ</span></span></p></td><td style="vertical-align:top; width:195px"><p><span style="font-size:16px"> <strong><span style="font-family:幼圓">———— </span></strong></span></p></td><td style="vertical-align:top; width:187px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 10A</span></span></p></td></tr><tr><td style="vertical-align:top; width:190px"><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="vertical-align:top; width:195px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 10A</span></span></p></td><td style="vertical-align:top; width:187px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 1A</span></span></p></td></tr><tr><td style="vertical-align:top; width:190px"><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="vertical-align:top; width:195px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 1A</span></span></p></td><td style="vertical-align:top; width:187px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 400</span><span style="font-family:times new roman">mA</span></span></p></td></tr><tr><td style="vertical-align:top; width:190px"><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="vertical-align:top; width:195px"><p><span style="font-size:16px"> <span style="font-family:times new roman">400mA</span></span></p></td><td style="vertical-align:top; width:187px"><p><span style="font-size:16px"> <span style="font-family:times new roman">100mA</span></span></p></td></tr><tr><td style="vertical-align:top; width:190px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 2Ω</span></span></p></td><td style="vertical-align:top; width:195px"><p><span style="font-size:16px"> <span style="font-family:times new roman">100mA</span></span></p></td><td style="vertical-align:top; width:187px"><p><span style="font-size:16px"> <span style="font-family:times new roman">10mA</span></span></p></td></tr><tr><td style="vertical-align:top; width:190px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 20Ω</span></span></p></td><td style="vertical-align:top; width:195px"><p><span style="font-size:16px"> <span style="font-family:times new roman">10mA</span></span></p></td><td style="vertical-align:top; width:187px"><p><span style="font-size:16px"> <span style="font-family:times new roman">1mA</span></span></p></td></tr><tr><td style="vertical-align:top; width:190px"><p><span style="font-size:16px"><span style="font-family:幼圓"> 200Ω</span></span></p></td><td style="vertical-align:top; width:195px"><p><span style="font-size:16px"> <span style="font-family:times new roman">1mA</span></span></p></td><td style="vertical-align:top; width:187px"><p><span style="font-size:16px"> <strong><span style="font-family:幼圓">————</span></strong></span></p></td></tr><tr><td colspan="3" style="vertical-align:top; width:572px"><p><span style="font-size:16px"> </span></p></td></tr></tbody></table><p><span style="font-size:16px"><strong><span style="font-family:幼圓">3.5雙向電流測量</span></strong></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"><strong><span style="font-family:幼圓">3.6 銅鋁導(dǎo)線溫度校正，人工輸入環(huán)境溫度(PC36C)：</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.6,1溫度校正范圍：環(huán)境溫度設(shè)定值 15.0—25.0℃，小步進(jìn)值0.1℃。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.6.2溫度校正特性</span><span style="font-family:times new roman">:</span><span style="font-family:幼圓"> 當(dāng)被測電阻的材質(zhì)為銅或鋁時(shí)，溫度校正系數(shù)</span><em><span style="font-family:times new roman">K</span></em><em><sub><span style="font-family:times new roman">t</span></sub></em><span style="font-family:幼圓">符合下列公式：</span></span></p><p><span style="font-size:16px"> <em><span style="font-family:times new roman">K</span></em><em><sub><span style="font-family:times new roman">t</span></sub></em><span style="font-family:times new roman"> = 1/ [1+0.004( t-20 )] = 250 / (230 + t )</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">其中: </span><span style="font-family:times new roman">t</span><span style="font-family:幼圓">為環(huán)境溫度</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.6.3儀表示值 </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">= </span><em><span style="font-family:times new roman">R</span></em><em><sub><span style="font-family:times new roman">20</span></sub></em><span style="font-family:times new roman"> = </span><em><span style="font-family:times new roman">K</span></em><em><sub><span style="font-family:times new roman">t</span></sub></em><em><span style="font-family:times new roman">*R</span></em><em><sub><span style="font-family:times new roman">t</span></sub></em></span></p><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">20</span></sub></em><span style="font-family:幼圓">：20℃時(shí)的電阻值 </span><em><span style="font-family:times new roman">R</span></em><em><sub><span style="font-family:times new roman">t</span></sub></em><span style="font-family:幼圓">：環(huán)境溫度為</span><span style="font-family:times new roman">t </span><span style="font-family:幼圓">時(shí)的電阻值</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:times new roman">3.7</span></strong><strong><span style="font-family:幼圓">自動(dòng)溫度測量以及溫度校正(PC36E)：</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.7.1 溫度測量范圍： 0—40℃,分辨力： 0.01℃。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.7.2</span> <span style="font-family:幼圓">溫度測量準(zhǔn)確度：</span></span></p><p><span style="font-size:16px"> <span style="font-family:幼圓"> 在15—25℃范圍內(nèi)，溫度測量誤差不大于±0.05℃</span><span style="font-family:宋體">;</span></span></p><p><span style="font-size:16px"> <span style="font-family:幼圓">在10—30℃范圍內(nèi)，溫度測量誤差不大于±0.1℃</span><span style="font-family:宋體">;</span></span></p><p><span style="font-size:16px"> <span style="font-family:幼圓">在0—40℃范圍內(nèi)，溫度測量誤差不大于±0.15℃。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.7.3溫度校正特性</span><span style="font-family:times new roman">:</span><span style="font-family:幼圓"> 溫度校正系數(shù)</span><em><span style="font-family:times new roman">K</span></em><em><sub><span style="font-family:times new roman">t</span></sub></em><span style="font-family:幼圓">符合下列公式：</span></span></p><p><span style="font-size:16px"> <em><span style="font-family:times new roman">K</span></em><em><sub><span style="font-family:times new roman">t</span></sub></em><span style="font-family:times new roman"> = 1/ [1+α</span><sub><span style="font-family:宋體">20</span></sub><span style="font-family:times new roman">( t-20 )] </span> <span style="font-family:宋體">. </span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">其中: </span><span style="font-family:times new roman">t</span><span style="font-family:宋體">：試樣溫度 </span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">4</span></span></p><p><span style="font-size:16px"><span style="font-family:times new roman">α</span><sub><span style="font-family:宋體">20</span></sub><span style="font-family:宋體">：導(dǎo)線材料的電阻溫度系數(shù)（20℃）,常用導(dǎo)體材質(zhì)的</span><span style="font-family:times new roman">α</span><sub><span style="font-family:宋體">20</span></sub><span style="font-family:宋體">數(shù)據(jù)為： </span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">銅及鋁排：</span><span style="font-family:times new roman">α</span><sub><span style="font-family:宋體">20</span></sub><span style="font-family:宋體"> =3.93×10</span><sup><span style="font-family:宋體">-3</span></sup><span style="font-family:宋體">/℃；硬鋁線： </span><span style="font-family:times new roman">α</span><sub><span style="font-family:宋體">20</span></sub><span style="font-family:宋體"> =4.03×10</span><sup><span style="font-family:宋體">-3</span></sup><span style="font-family:宋體">/℃；</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">退火鋁線：</span><span style="font-family:times new roman">α</span><sub><span style="font-family:宋體">20</span></sub><span style="font-family:宋體"> =4.07×10</span><sup><span style="font-family:宋體">-3</span></sup><span style="font-family:宋體">/℃ (以上數(shù)據(jù)來之GB/T 3048.2附錄B)</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">硬銅線（粗，直徑大于等于2mm）：</span><span style="font-family:times new roman">α</span><sub><span style="font-family:宋體">20</span></sub><span style="font-family:宋體"> =3.81×10</span><sup><span style="font-family:宋體">-3</span></sup><span style="font-family:宋體">/℃；</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">硬銅線（細(xì)，直徑小于2mm）：</span><span style="font-family:times new roman">α</span><sub><span style="font-family:宋體">20</span></sub><span style="font-family:宋體"> =3.77×10</span><sup><span style="font-family:宋體">-3</span></sup><span style="font-family:宋體">/℃；(以上數(shù)據(jù)來之GB/T 3953)</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">PC36E面板上設(shè)置了上述5種導(dǎo)體材料溫度系數(shù)</span><span style="font-family:times new roman">α</span><sub><span style="font-family:宋體">20</span></sub><span style="font-family:幼圓">的選擇開關(guān)，</span><span style="font-family:times new roman">α</span><sub><span style="font-family:宋體">20</span></sub><span style="font-family:幼圓">的數(shù)值顯示在儀表屏幕上。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.7.4儀表示值 </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">= </span><em><span style="font-family:times new roman">R</span></em><em><sub><span style="font-family:times new roman">20</span></sub></em><span style="font-family:times new roman"> = </span><em><span style="font-family:times new roman">K</span></em><em><sub><span style="font-family:times new roman">t</span></sub></em><em><span style="font-family:times new roman">*R</span></em><em><sub><span style="font-family:times new roman">t</span></sub></em></span></p><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">20</span></sub></em><span style="font-family:幼圓">：20℃時(shí)的電阻值 </span><em><span style="font-family:times new roman">R</span></em><em><sub><span style="font-family:times new roman">t</span></sub></em><span style="font-family:幼圓">：環(huán)境溫度為</span><span style="font-family:times new roman">t </span><span style="font-family:幼圓">時(shí)的電阻值</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.7.5 溫度校正附加誤差</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.7.5.1 溫度校正靜態(tài)誤差：</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">在環(huán)境溫度充分穩(wěn)定, 被測量試樣在測量環(huán)境中放置足夠長時(shí)間后，溫度校正附加誤差為儀表測溫誤差與材料溫度系數(shù)</span><span style="font-family:times new roman">α</span><sub><span style="font-family:宋體">20</span></sub><span style="font-family:幼圓">的乘積：</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">在15—25℃范圍內(nèi)，溫度校正附加誤差不大于±0.02</span><span style="font-family:times new roman">%</span><span style="font-family:宋體">;</span></span></p><p><span style="font-size:16px"> <span style="font-family:幼圓">在10—30℃范圍內(nèi)，溫度校正附加誤差不大于±0.04</span><span style="font-family:times new roman">%</span><span style="font-family:宋體">;</span></span></p><p><span style="font-size:16px"> <span style="font-family:幼圓">在0—40℃范圍內(nèi)，溫度校正附加誤差不大于±0.06</span><span style="font-family:times new roman">%</span><span style="font-family:幼圓">。</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">3.7.5.2 溫度校正動(dòng)態(tài)誤差：</span></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">在環(huán)境溫度有波動(dòng)，或被測量試樣的溫度與環(huán)境溫度有明顯差異時(shí)，由于試樣與周圍環(huán)境存在熱交換，試樣的溫度不穩(wěn)定，而且表面溫度與中心溫度不一致，位置處于試樣表面的溫度傳感器無法地測量試樣的真實(shí)溫度，造成溫度校正動(dòng)態(tài)誤差，超過3.7.5.1的允許誤差范圍, 用戶應(yīng)該盡量避免上述情況的發(fā)生。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">3.8</span></strong> <strong><span style="font-family:幼圓">絕緣電阻</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">電源輸入端與機(jī)殼接地端及儀表測量端之間的絕緣電阻應(yīng)不小于20MΩ。</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:幼圓">3.9 工頻耐壓</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:幼圓">電源輸入端與機(jī)殼接地端及儀表測量端之間應(yīng)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(shí)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(shí)1</span><span style="font-family:times new roman">min</span><span style="font-family:幼圓">試驗(yàn)，無擊穿或飛弧現(xiàn)象。</span></span></p> <div id="iqaqewgi6e" class="clear"></div> </div> <div id="iqaqewgi6e" class="article"> <p>上一篇：<a href="/Article-1810419.html">氧化鋅避雷器測試儀現(xiàn)場試驗(yàn)故障排除</a></p> <p>下一篇：<a href="/Article-1807191.html">PVT-5C工頻耐電壓試驗(yàn)儀概述及特點(diǎn)</a></p> </div> <div id="iqaqewgi6e" class="clear"></div> </div> </div> <div id="iqaqewgi6e" class="n-9"> <div id="iqaqewgi6e" class="c-right"> <div id="iqaqewgi6e" class="c-1 r-pro"> <div id="iqaqewgi6e" class="c-left"> <div id="iqaqewgi6e" class="h-2"><a 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