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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> </tbody> </table> </section><p>FET-2數(shù)字式接地電阻測試儀</p><p>FET-2數(shù)字式接地電阻測試儀</p><p></p><p><strong>上?？档请姎饪萍加邢薰?/strong></p><p>FET-2數(shù)字接地電阻測量儀</p><p>FET-2數(shù)字接地電阻測量儀主要用于測量接地極、接地體等接地裝置接地電阻。采用集成電路逆變器恒流源，性能*，輸出電流大，數(shù)字顯示，分辨率高，誤差小。增加了地電壓測量功能，可方便地測量接地體上的地電壓。</p><p><br />主要功能特點(diǎn)</p><p><br />★低功耗，zui大值為12V/100mA</p><p><br />★接地電阻值可直接從液晶表上讀出</p><p><br />★不需拆下面板即可更換電池</p><p><br />★自檢功能：儀器自檢接線是否正確，自檢電池電壓，欠壓提示</p><p><br />★儀器具有檢測接線是否正確的功能</p><p><br />★儀器采用便攜式工程塑料箱，箱子本身結(jié)實(shí)耐磨，防水，一箱式結(jié)構(gòu)</p><p><br />主要技術(shù)指標(biāo)</p><p><br />★測量范圍：電阻0～199.99Ω 電壓0～20V（參考）</p><p><br />★準(zhǔn)確度：接地電阻≤±3％（示值）±5個字</p><p><br />★供電方式：DC12V（8節(jié)5號1.5V電池）</p><p><br /><span style="font-family:宋體; font-size:12px">1、接地電阻測量（如圖一）</span><br /><br /><img alt="" src="http://i01.yizimg.com/ComFolder/586162/201403/%E5%9B%BE%E7%89%87111.jpg" style="height:auto; margin:0px auto 5px !important; width:280px" /><br /><span style="font-family:宋體; font-size:12px">· 沿被測接地極E（C2、P2）和電位探針P1及電流探針C1，依直線彼此相距20米，使電位探針處于E、C中間位置，按要求將探針插入大地。</span><br /><span style="font-family:宋體; font-size:12px">· 用導(dǎo)線將地阻儀端子E（C2、P2）、P1、C1與探針?biāo)谖恢脤?yīng)聯(lián)接。</span><br /><span style="font-family:宋體; font-size:12px">· 開啟地阻儀電源開關(guān)“ON”，選擇合適擋位輕按一下鍵該檔指標(biāo)燈亮，表頭LCD顯示的數(shù)值即為被測得的地電阻。</span><br /><span style="font-family:宋體; font-size:12px">2、土壤電阻率測量（如圖二）</span><br /><br /><img alt="" src="http://i01.yizimg.com/ComFolder/586162/201403/%E6%88%AA%E5%9B%BE20140324135627.jpg" style="height:auto; margin:0px auto 5px !important; width:262px" /><br /><span style="font-family:宋體; font-size:12px">· 測量時在被測的土壤中沿直線插入四根探針，并使各探針間距相等，各間距的距離為L，要求探針入地深度為L/20cm，用導(dǎo)線分別從C1、P1、P2、C2各端子與四根探針相連接。若地阻儀測出電阻值為R，則土壤電阻率按下式計(jì)算：</span><br /><span style="font-family:宋體; font-size:12px">Ф=2πRL</span><span style="font-family:宋體; font-size:12px"> </span><br /><span style="font-family:宋體; font-size:12px">其中</span><br /><span style="font-family:宋體; font-size:12px">Ф—土壤電阻率（Ω·cm）</span><br /><span style="font-family:宋體; font-size:12px">L—探針與探針之間的距離(cm)</span><br /><span style="font-family:宋體; font-size:12px">R—地阻儀的讀數(shù)（Ω）</span><br /><span style="font-family:宋體; font-size:12px">用此法測得的土壤電阻率可近似認(rèn)為是被埋入探針之間區(qū)域內(nèi)的平均土壤電阻率。</span><br /><span style="font-family:宋體; font-size:12px">· 測地電阻、土壤電阻率所用的探針一般用鋁合金管或圓鋼。</span><br /><span style="font-family:宋體; font-size:12px">3、導(dǎo)體電阻測量（圖三）</span><br /><img alt="" src="http://i01.yizimg.com/ComFolder/586162/201403/%E6%88%AA%E5%9B%BE20140324135716.jpg" style="height:auto; margin:0px auto 5px !important; width:287px" /><br /><span style="font-family:宋體; font-size:12px">4、地電壓測量</span><br /><span style="font-family:宋體; font-size:12px">測量接線如圖一，撥掉C1插頭，E、P1間的插頭保留，啟動地電壓（EV）檔，指示燈亮，讀取表頭數(shù)值即為E、P1間的交流地電壓值。</span><br /><span style="font-family:宋體; font-size:12px">5、測量完畢按一下電源“OFF”鍵，儀表關(guān)機(jī)。</span><br /><span style="font-family:宋體; font-size:12px">四、注意事項(xiàng)</span><br /><span style="font-family:宋體; font-size:12px">1、存放保管本表時，應(yīng)注意環(huán)境溫度濕度，應(yīng)放在干燥通風(fēng)的地方為宜，避免受潮，應(yīng)防止酸堿及腐蝕氣體。</span><br /><span style="font-family:宋體; font-size:12px">2、測量保護(hù)接地電阻時，一定要斷開電氣設(shè)備與電源連接點(diǎn)。在測量小于1Ω的接地電阻時，應(yīng)分別用導(dǎo)線連在接地體上，C2在外側(cè)P2在內(nèi)側(cè)如圖四所示：</span><br /><br /><img alt="" src="http://i01.yizimg.com/ComFolder/586162/201403/%E6%88%AA%E5%9B%BE20140324135754.jpg" style="height:auto; margin:0px auto 5px !important; width:315px" /><br /><span style="font-family:宋體; font-size:12px">3、測量大型接地網(wǎng)接地電阻時，不能按一般接線方法測量，可參照電流表、電壓表測量法中的規(guī)定選定埋插點(diǎn)。</span><br /><span style="font-family:宋體; font-size:12px">4、測量地電阻時反復(fù)在不同的方向測量3～4次，取其平均值。</span><br /><span style="font-family:宋體; font-size:12px">5、本儀表為交直流兩用，不接交流電時，儀表使用電池供電，接入交流時，優(yōu)先使用交流電。</span><br /><span style="font-family:宋體; font-size:12px">6、當(dāng)表頭左上角顯示“←”時表示電池電壓不足，應(yīng)更換新電池。儀表長期不用時，應(yīng)將電池全部取出，以免銹蝕儀表。</span><br /><br /><span style="font-family:宋體; font-size:12px">五、附件清單</span><br /><span style="font-family:宋體; font-size:12px">１．儀器主機(jī) 1臺</span><br /><span style="font-family:宋體; font-size:12px">２．測試線共4根</span><br /><span style="font-family:宋體; font-size:12px">包含：1.5m紅線 1根</span><br /><span style="font-family:宋體; font-size:12px">1.5m黑線 1根</span><br /><span style="font-family:宋體; font-size:12px">20m黑線 1根</span><br /><span style="font-family:宋體; font-size:12px">40m紅線 1根</span><br 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