鉗形接地電阻測試儀現(xiàn)場應(yīng)用-上?？档请姎饪萍加邢薰?/title> <link type="text/css" rel="stylesheet" href="/Skins/106676/css/index.css" /> <script src="/skins/106676/js/jquery-3.6.0.min.js"></script> <link rel="stylesheet" type="text/css" href="/skins/106676/css/swiper.min.css"> <script type="text/javascript" src="/skins/106676/js/swiper.min.js"></script>  <script language="javascript" type="text/javascript"> var nav= '5'; var menu= '0'; </script>  <link rel="shortcut icon" href="/skins/106676/favicon.ico"> <script type="application/ld+json"> { "@context": "https://ziyuan.baidu.com/contexts/cambrian.jsonld", "@id": "http:///Article-3185068.html", "title": "鉗形接地電阻測試儀現(xiàn)場應(yīng)用", "pubDate": "2022-11-05T09:50:23", "upDate": "2022-11-05T09:50:23" }</script> <script language="javaScript" src="/js/JSChat.js"></script><script language="javaScript">function ChatBoxClickGXH() { DoChatBoxClickGXH('https://chat.chem17.com',83189) }</script><script>!window.jQuery && document.write('<script 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src="http://www.chem17.com/mystat.aspx?u=mbdzkj"></script>  <div id="iqaqewgi6e" class="ncontent w_1100"> <div id="iqaqewgi6e" class="h-6">技術(shù)文章<span>您當(dāng)前的位置：<a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > 鉗形接地電阻測試儀現(xiàn)場應(yīng)用</span></div>  <div id="iqaqewgi6e" class="n-3 c-news"> <div id="iqaqewgi6e" class="newsnr"> <h1>鉗形接地電阻測試儀現(xiàn)場應(yīng)用</h1> <p class="source"><span>日期：2022-11-05</span><span>瀏覽：1040次</span></p> <div> <p style="margin-left:52px"><strong><span style=";font-family:黑體;font-size:19px"><span style="font-family:黑體">鉗形接地電阻測試儀現(xiàn)場應(yīng)用</span></span></strong></p><p><strong><span style=";font-family:黑體;font-size:19px"><span style="font-family:黑體">1．鉗形接地電阻測試儀多點接地系統(tǒng)</span></span></strong></p><p style="text-indent: 37px;line-height: 24px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">對多點接地系統(tǒng)（例如輸電系統(tǒng)桿塔接地、通信電纜接地系統(tǒng)、某些建筑物等），它們通過架空地線（通信電纜的屏蔽層）連接，組成了接地系統(tǒng)。見下圖。當(dāng)用鉗表測量時，其等效電路如下：</span></span></p><p><br/></p><p><img src="https://img63.chem17.com/9/20221105/638032380803913424130.png" title="JW38FW5KO465MUP4U`K0HYP.png" alt="JW38FW5KO465MUP4U`K0HYP.png"/><br/></p><p style="margin-left: 0;text-indent: 37px;line-height: 24px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">其中：</span><span style="font-family:宋體">R1為預(yù)測的接地電阻。</span></span></p><p style="margin-left: 0;text-indent: 93px;line-height: 24px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">R0為所有其它桿塔的接地電阻并聯(lián)后的等效電阻。</span></span></p><p style="margin-left: 0;text-indent: 37px;line-height: 24px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">雖然，從嚴(yán)格的接地理論來說，由于有所謂的</span><span style="font-family:宋體">“互電阻"的存在，R0并不是通常的電工學(xué)意義上的并聯(lián)值（它會比電工學(xué)意義上的并聯(lián)值稍大），但是，由于每一個桿塔的接地半球比起桿塔之間的距離要小得多，而且畢竟接地點數(shù)量很大，R0要比R1小得多。因此，可以從工程角度有理由地假設(shè)R0=0。這樣，我們所測的電阻就應(yīng)該是R1了。</span></span></p><p style="margin-left: 0;text-indent: 37px;line-height: 24px"><span style="font-size: 19px; font-family: 宋體;">多次不同環(huán)境、不同場合下與傳統(tǒng)方法進(jìn)行對比試驗，證明上述假設(shè)是</span><span style="font-size: 18px;">合理的</span>。</p><p style="margin-left: 0;line-height: 24px"><strong><span style=";font-family:黑體;font-size:19px"><span style="font-family:黑體">2．鉗形接地電阻測試儀有限點接地系統(tǒng)</span></span></strong><strong></strong></p><p style="margin-left: 0;text-indent: 37px;line-height: 24px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">這種情況也較普遍。例如有些桿塔是</span><span style="font-family:宋體">5個桿塔通過架空地線彼此相連；再如某些建筑物的接地也不是一個獨(dú)立的接地網(wǎng)，而是幾個接地體通過導(dǎo)線彼此連接。</span></span><span style=";font-family:宋體;font-size:19px"><br/></span><span style=";font-family:宋體;font-size:19px"> <span style="font-family:宋體">在這種情況下，如果將上圖中的</span><span style="font-family:宋體">R0視為0則會對測量結(jié)果帶來較大誤差。</span></span><span style=";font-family:宋體;font-size:19px"><br/></span><span style=";font-family:宋體;font-size:19px"> <span style="font-family:宋體">出于與上述同樣的理由，我們忽略互電阻的影響，將接地電阻的并聯(lián)后的等效電阻按通常意義上的計算方法計算。這樣，對于</span><span style="font-family:宋體">N個（N較小，但大于2）接地體的接地系統(tǒng)，就可以列出N個方程：</span></span></p><p style="margin-left: 0;text-indent: 37px;line-height: 24px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體"></span></span></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體"><br/></span></span></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體"><br/></span></span></p><p style="text-indent:37px"><img src="https://img61.chem17.com/9/20221105/638032381614838324590.png" title="2LKX0})N6IZ8OMWP2[[NWW8.png" alt="2LKX0})N6IZ8OMWP2[[NWW8.png" style="text-indent: 28px;"/><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體"><br/></span></span></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">其中：</span><span style="font-family:宋體">R1、R2、…….RN是我們要求得的N個接地體的接地電阻。</span></span></p><p style="text-indent:93px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">R1T、R2T、……RNT分別是用鉗表在各接地支路所測得的電阻。</span></span><span style=";font-family:宋體;font-size:19px"><br/></span><span style=";font-family:宋體;font-size:19px"> <span style="font-family:宋體">這是一個有</span><span style="font-family:宋體">N個未知數(shù)，N個方程的非線性方程組。它是有確定解的，但是人工解它是十分困難的，當(dāng)N較大時甚至是不可能的。</span></span><span style=";font-family:宋體;font-size:19px"><br/></span><span style=";font-family:宋體;font-size:19px"> <span style="font-family:宋體">為此，請選購我公司的有限點接地系統(tǒng)解算程序軟件，用戶即可使用辦公電腦或手提電腦進(jìn)行機(jī)解。</span></span><span style=";font-family:宋體;font-size:19px"><br/></span><span style=";font-family:宋體;font-size:19px"> <span style="font-family:宋體">從原理上來說，除了忽略互電阻以外，這種方法不存在忽略</span><span style="font-family:宋體">R0所帶來的測量誤差。</span></span><span style=";font-family:宋體;font-size:19px"><br/></span><span style=";font-family:宋體;font-size:19px"> <span style="font-family:宋體">但是，用戶需要注意的是：您的接地系統(tǒng)中，有幾個彼此相連接的接地體，就必須測量出同樣個數(shù)的測試值供程序解算，不能或多或少。而程序也是輸出同樣個數(shù)的接地電阻值。</span></span></p><p style="margin-left: 0;line-height: 24px"><strong><span style=";font-family:黑體;font-size:19px"><span style="font-family:黑體">2．鉗形接地電阻測試儀單點接地系統(tǒng)</span></span></strong><strong></strong></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">從測試原理來說，鉗表只能測量回路電阻，對單點接地是測不出來的。但是，用戶 </span>可以利用一根測試線及接地系統(tǒng)附近的接地極，人為地制造一個回路進(jìn)行測試。下面介紹二種用鉗表測量單點接地的方法，此方法可應(yīng)用于傳統(tǒng)的電壓<span style="font-family:宋體">-電流法無法測試的場合。</span></span></p><p style="text-indent:37px"><strong><span style=";font-family:黑體;font-size:19px"><span style="font-family:黑體">⑴．二點法</span></span></strong><strong></strong></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">見下圖，在被測接地體</span><span style="font-family:宋體">RA附近找一個獨(dú)立的接地較好的接地體RB（例如臨近的自來水管、建筑物等）。將RA和RB用一根測試線連接起來。</span></span></p><p style="text-indent:28px"><span style=";font-family:宋體;font-size:19px"> </span></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"> </span></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"> <img src="https://img61.chem17.com/9/20221105/638032382114815528357.png" title="J~C{4T74I@RKF4`OQ9$_C62.png" alt="J~C{4T74I@RKF4`OQ9$_C62.png"/></span></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"> </span></p><p><span style=";font-family:宋體;font-size:19px"> </span></p><p style="text-indent:37px"><span style="font-family: 宋體; font-size: 19px;">由于鉗表所測的阻值是兩個接地電阻和測試線阻值的串聯(lián)值。</span><br/></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">RT=RA+RB+RL</span></span></p><p><span style=";font-family:宋體;font-size:19px"> <span style="font-family:宋體">其中：</span><span style="font-family:宋體">RT為鉗表所測的阻值。</span></span></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">RL為測試線的阻值。</span></span></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">將測試線頭尾相連即可用鉗表測出其阻值</span><span style="font-family:宋體">RL。</span></span></p><p><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">所以，如果鉗表的測量值小于接地電阻的允許值，那么這兩個接地體的接地電阻都是合格的。</span></span><span style=";font-family:宋體;font-size:19px"><br/></span></p><p style="margin-left: 0;text-indent: 37px;line-height: 24px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體"><br/></span></span></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">阻都是合格的。</span></span><span style=";font-family:宋體;font-size:19px"><br/></span><span style=";font-family:黑體;font-size:14px"> </span><strong><span style=";font-family:黑體;font-size:19px"> <span style="font-family:黑體">⑵．鉗形接地電阻測試儀三點法</span></span></strong></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">如下圖，在被測接地體</span><span style="font-family:宋體">RA附近找二個獨(dú)立的接地體RB和RC。</span></span></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">第一步，將</span><span style="font-family:宋體">RA和RB用一根測試線連接起來，見下圖。用鉗表讀得第一個數(shù)據(jù)R1。</span></span></p><p style="text-indent: 37px;"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體"><img src="https://img66.chem17.com/9/20221105/638032384287057430273.png" title="O[BA01)OSK4ZGUFXFJV5BWP.png" alt="O[BA01)OSK4ZGUFXFJV5BWP.png" width="1" height="1" style="width: 1px; height: 1px;"/><img src="https://img63.chem17.com/9/20221105/638032384662612479424.png" title="O[BA01)OSK4ZGUFXFJV5BWP.png" alt="O[BA01)OSK4ZGUFXFJV5BWP.png"/></span></span></p><p style="text-indent: 37px;"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體"><br/></span></span></p><p style="text-indent: 37px;"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體"><br/></span></span></p><p style="text-indent: 37px;"><br/></p><p style="text-indent:37px;line-height:24px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">上面三步中，每一步所測得的讀數(shù)都是兩個接地電阻的串聯(lián)值。這樣，就可以很容易地計算出每一個接地電阻值：</span></span></p><p style="text-indent:37px;line-height:24px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">由于：</span> <span style="font-family:宋體">R1=RA+RB R2=RB+RC R3=RC+RA</span></span></p><p style="text-indent:37px;line-height:24px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">所以：</span> <span style="font-family:宋體">RA=（R1+R3-R2）÷2</span></span></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">這就是接地體</span><span style="font-family:宋體">RA的接地電阻值。為了便于記憶上述公式，可將三個接地體看作一個三角形，則被測電阻等于鄰邊電阻相加減對邊電阻除2。</span></span></p><p style="text-indent:37px;line-height:24px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">其它兩個作為參照物的接地體的接地電阻值為：</span></span></p><p style="text-indent:37px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">RB=R1-RA RC=R3-RA</span></span></p><p style="text-indent: 37px;"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體"><br/></span></span></p> <div id="iqaqewgi6e" class="clear"></div> </div> <div id="iqaqewgi6e" class="article"> <p>上一篇：<a href="/Article-3185071.html">KD50A絕緣電阻測試儀測量方法</a></p> <p>下一篇：<a href="/Article-3185059.html">鉗形接地電阻測試儀技術(shù)參數(shù)</a></p> </div> <div id="iqaqewgi6e" class="clear"></div> </div> </div> <div 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href="/SonList-1324316.html">> 橡膠錘、電工鑿</a></li> <li><a href="/SonList-1324314.html">> 不銹鋼通條、通刷</a></li> <li><a href="/SonList-1324313.html">> 不銹鋼劃線板</a></li> <li><a href="/SonList-1324312.html">> 不銹鋼壓線板</a></li> </ul> </div> </li> <li><a href="/ParentList-1324298.html" onmouseover="showsubmenu('漆包線電動刮漆器總匯')" class="yj">漆包線電動刮漆器總匯</a> <div class="iqaqewgi6e" id="submenu_漆包線電動刮漆器總匯" style="display:none"> <ul> <li><a href="/SonList-1324300.html">> 漆包線電動刮漆器</a></li> </ul> </div> </li> <li><a href="/ParentList-1324280.html" onmouseover="showsubmenu('電機(jī)萬用繞線模總匯')" class="yj">電機(jī)萬用繞線?？倕R</a> <div class="iqaqewgi6e" id="submenu_電機(jī)萬用繞線?？倕R" style="display:none"> <ul> <li><a href="/SonList-1324281.html">> 電機(jī)萬用繞線模</a></li> </ul> </div> </li> <li><a href="/ParentList-1324244.html" onmouseover="showsubmenu('拆線機(jī)、烘箱總匯')" class="yj">拆線機(jī)、烘箱總匯</a> <div class="iqaqewgi6e" id="submenu_拆線機(jī)、烘箱總匯" style="display:none"> <ul> <li><a href="/SonList-1324253.html">> 電機(jī)鼠籠烘烤器</a></li> <li><a href="/SonList-1324252.html">> 電熱恒溫鼓風(fēng)干燥箱</a></li> <li><a href="/SonList-1324250.html">> 電機(jī)浸漆烘干機(jī)</a></li> <li><a href="/SonList-1324249.html">> 電機(jī)割線機(jī)</a></li> <li><a href="/SonList-1324248.html">> 電動臥式拆切線機(jī)</a></li> <li><a href="/SonList-1324247.html">> 電機(jī)通用拆線機(jī)</a></li> <li><a href="/SonList-1324245.html">> 電機(jī)電動拆線機(jī)</a></li> </ul> </div> </li> <li><a href="/ParentList-1324231.html" onmouseover="showsubmenu('數(shù)控繞線機(jī)總匯')" class="yj">數(shù)控繞線機(jī)總匯</a> <div class="iqaqewgi6e" id="submenu_數(shù)控繞線機(jī)總匯" style="display:none"> <ul> <li><a href="/SonList-1324235.html">> 手搖繞線機(jī)</a></li> <li><a href="/SonList-1324234.html">> 中型多用繞線機(jī)</a></li> <li><a href="/SonList-1324233.html">> 數(shù)控自動排線機(jī)</a></li> <li><a href="/SonList-1324232.html">> 數(shù)控自動繞線機(jī)</a></li> </ul> </div> </li> <li><a href="/ParentList-1324217.html" onmouseover="showsubmenu('國內(nèi)外工業(yè)修補(bǔ)劑總匯')" class="yj">國內(nèi)外工業(yè)修補(bǔ)劑總匯</a> <div 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href="/SonList-1323788.html">> 多功能壓力機(jī)</a></li> <li><a href="/SonList-1323786.html">> 液壓螺栓拉伸器</a></li> <li><a href="/SonList-1323785.html">> 螺栓修復(fù)器</a></li> <li><a href="/SonList-1323784.html">> 液壓法蘭分離器</a></li> <li><a href="/SonList-1323783.html">> 多功能液壓開孔器</a></li> <li><a href="/SonList-1323782.html">> 斷頭螺絲取出器</a></li> <li><a href="/SonList-1323781.html">> 液壓螺帽破開器</a></li> </ul> </div> </li> <li><a href="/ParentList-1323603.html" onmouseover="showsubmenu('搬運(yùn)吊裝工具總匯')" class="yj">搬運(yùn)吊裝工具總匯</a> <div class="iqaqewgi6e" id="submenu_搬運(yùn)吊裝工具總匯" style="display:none"> <ul> <li><a href="/SonList-1323611.html">> 吊機(jī)、吊裝帶</a></li> <li><a href="/SonList-1323609.html">> 手動、電動葫蘆</a></li> <li><a href="/SonList-1323608.html">> 液壓平臺車</a></li> <li><a href="/SonList-1323607.html">> 液壓升降臺</a></li> <li><a href="/SonList-1323606.html">> 液壓叉車、電動叉車</a></li> <li><a href="/SonList-1323604.html">> 液壓搬運(yùn)車、電動搬運(yùn)車</a></li> </ul> </div> </li> <li><a href="/ParentList-1323475.html" onmouseover="showsubmenu('焊割設(shè)備、坡口機(jī)總匯')" class="yj">焊割設(shè)備、坡口機(jī)總匯</a> <div class="iqaqewgi6e" id="submenu_焊割設(shè)備、坡口機(jī)總匯" style="display:none"> <ul> <li><a href="/SonList-1323542.html">> 交直流氬弧焊機(jī)</a></li> <li><a href="/SonList-1323497.html">> 氣割機(jī)</a></li> <li><a href="/SonList-1323495.html">> 坡口機(jī)</a></li> <li><a href="/SonList-1323494.html">> 焊條焊箱、保溫箱</a></li> <li><a href="/SonList-1323493.html">> 螺栓焊機(jī)</a></li> <li><a href="/SonList-1323491.html">> 點焊機(jī)</a></li> <li><a href="/SonList-1323490.html">> 二氧化碳?xì)怏w焊機(jī)</a></li> <li><a href="/SonList-1323487.html">> 直流氬弧焊機(jī)</a></li> <li><a href="/SonList-1323482.html">> 直流弧焊機(jī)</a></li> <li><a href="/SonList-1323480.html">> 空氣等離子切割機(jī)</a></li> </ul> </div> </li> <li><a href="/ParentList-1323229.html" onmouseover="showsubmenu('液壓扳手總匯')" class="yj">液壓扳手總匯</a> <div class="iqaqewgi6e" id="submenu_液壓扳手總匯" style="display:none"> <ul> <li><a href="/SonList-1323243.html">> 套筒、液壓元件、快速接頭</a></li> <li><a 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液壓爪式起頂機(jī)</a></li> <li><a href="/SonList-1323170.html">> 雙節(jié)液壓千斤頂</a></li> <li><a href="/SonList-1323169.html">> 臥式液壓千斤頂</a></li> <li><a href="/SonList-1323168.html">> 螺旋式千斤頂</a></li> <li><a href="/SonList-1323167.html">> 立式油壓千斤頂</a></li> <li><a href="/SonList-1323166.html">> 立臥兩用千斤頂</a></li> <li><a href="/SonList-1323165.html">> 自鎖式液壓千斤頂</a></li> <li><a href="/SonList-1323164.html">> 中空式液壓千斤頂</a></li> <li><a href="/SonList-1323163.html">> 單作用薄型千斤頂</a></li> <li><a href="/SonList-1323161.html">> 分離式液壓千斤頂</a></li> </ul> </div> </li> <li><a href="/ParentList-1322984.html" onmouseover="showsubmenu('液壓拉馬總匯')" class="yj">液壓拉馬總匯</a> <div class="iqaqewgi6e" id="submenu_液壓拉馬總匯" style="display:none"> <ul> <li><a href="/SonList-1322996.html">> 液壓拉馬機(jī)械工具箱</a></li> <li><a href="/SonList-1322995.html">> 軸承起拔器/無損傷起拔器</a></li> <li><a href="/SonList-1322994.html">> 偶合器專用拉馬</a></li> <li><a href="/SonList-1322993.html">> 手動機(jī)械拉馬</a></li> <li><a href="/SonList-1322992.html">> 螺旋式齒輪拉馬</a></li> <li><a href="/SonList-1322990.html">> 機(jī)械/液壓防滑拔輪器</a></li> <li><a href="/SonList-1322989.html">> 車載式液壓拉馬</a></li> <li><a href="/SonList-1322988.html">> 分離式液壓拉馬</a></li> <li><a href="/SonList-1322987.html">> 分體式液壓拉馬</a></li> <li><a href="/SonList-1322986.html">> 一體式液壓拉馬</a></li> <li><a href="/SonList-1322985.html">> 螺旋拉力機(jī)/合攏器</a></li> </ul> </div> </li> <li><a href="/ParentList-1390308.html" onmouseover="showsubmenu('漏電流測試儀')" class="yj">漏電流測試儀</a> <div class="iqaqewgi6e" id="submenu_漏電流測試儀" style="display:none"> <ul> <li><a href="/SonList-1390309.html">> 漏電流測試儀</a></li> </ul> </div> </li> <li><a href="/ParentList-1390431.html" onmouseover="showsubmenu('直流低電阻測試儀')" class="yj">直流低電阻測試儀</a> <div class="iqaqewgi6e" id="submenu_直流低電阻測試儀" style="display:none"> <ul> <li><a href="/SonList-1390432.html">> 直流低電阻測試儀</a></li> </ul> </div> </li> <li><a href="/ParentList-1412169.html" onmouseover="showsubmenu('手表式近電報警器')" class="yj">手表式近電報警器</a> <div class="iqaqewgi6e" id="submenu_手表式近電報警器" style="display:none"> <ul> <li><a href="/SonList-1412171.html">> 手表式近電報警器</a></li> </ul> </div> </li> <li><a href="/ParentList-1414895.html" onmouseover="showsubmenu('直流電阻電橋')" class="yj">直流電阻電橋</a> <div class="iqaqewgi6e" id="submenu_直流電阻電橋" style="display:none"> <ul> <li><a href="/SonList-1420688.html">> 直流標(biāo)準(zhǔn)電壓電流發(fā)生器</a></li> <li><a href="/SonList-1420681.html">> 直流電阻分選儀</a></li> <li><a href="/SonList-1420636.html">> 直流檢流計</a></li> <li><a href="/SonList-1420635.html">> 直流電位差計</a></li> <li><a href="/SonList-1414898.html">> 標(biāo)準(zhǔn)電阻</a></li> <li><a href="/SonList-1414897.html">> 電阻箱</a></li> <li><a href="/SonList-1414896.html">> 電橋</a></li> </ul> </div> </li> <li><a href="/ParentList-1416032.html" onmouseover="showsubmenu('數(shù)字雙鉗相位伏安表')" class="yj">數(shù)字雙鉗相位伏安表</a> <div class="iqaqewgi6e" id="submenu_數(shù)字雙鉗相位伏安表" style="display:none"> <ul> <li><a href="/SonList-1422474.html">> 三相數(shù)字相位伏安表</a></li> <li><a href="/SonList-1422473.html">> 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