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<h2>新聞中心</h2> </div> <div id="jwtqlhw" class="hLocation"> <p><a href="http://dyxdggzs.com" target="_blank">EEPW首頁(yè)</a> > <a href="/info/industry/special/tm">測試測量</a> > <a href="/info/articlelist/special/tm/type/5">設計應用</a> > 實(shí)現精確測量?jì)纱蠓椒?/p> </div> </div> </div>    <div class="jmifdcd" id="container"> <section> <article> <h1>實(shí)現精確測量?jì)纱蠓椒?/h1> <div id="eczwvwp" class="authorTimeSource"> <span>作者：周立功致遠電子</span> <span>時(shí)間：2016-07-21</span> <span>來(lái)源：電子產(chǎn)品世界</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="waxrofg" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://dyxdggzs.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://dyxdggzs.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術(shù)大咖面對面交流<br />海量資料庫查詢(xún)</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="cytezws" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="djiii7n" class="content" id="contentDiv" style="position:relative;"> <div id="77m2xca" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p>　　為實(shí)現<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/測量"><em>測量</em></a>數據的準確性，選對合適的儀器外，測試<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/測量"><em>測量</em></a>方法選擇也不容小覷。</p>本文引用地址：<a href="http://dyxdggzs.com/article/201607/294363.htm">http://dyxdggzs.com/article/201607/294363.htm</a> <p>　　PA<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/功率分析儀"><em>功率分析儀</em></a>功率單元有兩路輸入：電流和電壓。FPGA和DSP等運算直接獲得的<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/測量"><em>測量</em></a>數據只有電壓和電流的ADC直接測量的結果，功率、效率、諧波等均以電壓電流測量為基礎，通過(guò)運算獲得的結果，如功率就是使用電壓和電流直接測量結果進(jìn)行的運算。所以電壓電流測量的準確性就顯得至關(guān)重要，導體的電阻率會(huì )隨溫度變化、器件老化、線(xiàn)路共模/串模干擾、測量走線(xiàn)接線(xiàn)方式、電路接線(xiàn)方式等都會(huì )影響測量結果，本文重點(diǎn)講解測量接線(xiàn)方式、電路接線(xiàn)。</p> <p>　　1.測量走線(xiàn)接線(xiàn)方式</p> <p>　　1)不規則連接--最差的接線(xiàn)方式</p> <p>　　圖 1、圖 2兩條測量線(xiàn)比較分散，形成很大的環(huán)路，當環(huán)路中有變化的磁通通過(guò)時(shí)，根據電磁感應原理，將在環(huán)路中產(chǎn)生與磁通同樣變化的噪聲電壓，儀器測到的值不真實(shí)。</p> <p>　　</p> <center><img alt="" width="312" height="127" src="http://editerupload.eepw.com.cn/201607/404ace2fd11d26f401cf27da0b258dd1.jpg" /></center> <p> </p> <p align="center">　　圖 1 電壓不規則接線(xiàn)方式</p> <p>　　</p> <center><img alt="" width="378" height="121" src="http://editerupload.eepw.com.cn/201607/37dc15e13b4ec1f12b99968f60bc7497.png" /></center> <p> </p> <p align="center">　　圖 2 電流不規則接線(xiàn)方式</p> <p>　　2)一般接線(xiàn)方式—平行走線(xiàn)</p> <p>　　圖 3、圖 4相比分散的連接方式，測量線(xiàn)形成的環(huán)路很小，僅限于連根線(xiàn)之間。</p> <p>　　</p> <center><img alt="" width="341" height="137" src="http://editerupload.eepw.com.cn/201607/2499f3c7002988da68f55503a8fbdad9.png" /></center> <p> </p> <p>　　圖 3 電壓平行走線(xiàn)接線(xiàn)方式</p> <p align="center">　　</p> <center><img alt="" width="378" height="121" src="http://editerupload.eepw.com.cn/201607/b8af8aabb62819f7aa022ddeffba5a92.png" /></center> <p> </p> <p align="center">　　圖 4 電流平行走線(xiàn)接線(xiàn)方式</p> <p>　　3)較好的連接方式—雙絞線(xiàn)</p> <p>　　圖 5使用雙絞線(xiàn)連接被測信號，與平行走線(xiàn)相比，雙絞線(xiàn)把環(huán)路細分到每個(gè)絞合環(huán)，相鄰的絞合環(huán)對外部磁場(chǎng)產(chǎn)生相反的噪聲電壓從而抵消掉。</p> <p>　　</p> <center><img alt="" width="341" height="137" src="http://editerupload.eepw.com.cn/201607/5b5fab3b9017de505596b9d7f7964e4c.png" /></center> <p> </p> <p align="center">　　圖 5 電壓雙絞線(xiàn)接線(xiàn)方式</p> <p>　　</p> <center><img alt="" width="378" height="120" src="http://editerupload.eepw.com.cn/201607/cb7ffd0a85fae8586b15a6e13f59e2ca.png" /></center> <p> </p> <p align="center">　　圖 6 電流雙絞線(xiàn)接線(xiàn)方式</p> <p>　　4)理想的接線(xiàn)方式—同軸電纜</p> <p>　　圖 7、圖 8對稱(chēng)的同軸電纜外層導體中心與內導體重合，等效面積為0，因此有很好的磁場(chǎng)屏蔽效果。</p> <p>　　</p> <center><img alt="" width="341" height="137" src="http://editerupload.eepw.com.cn/201607/6b8ce72e5be911ed3ef8223b406d8e97.jpg" /></center> <p> </p> <p align="center">　　圖 7 電壓同軸電纜接線(xiàn)方式</p> <p>　　</p> <center><img alt="" width="378" height="120" src="http://editerupload.eepw.com.cn/201607/57421f30a130b4a33033dde04d0eb99e.jpg" /></center> <p> </p> <p align="center">　　圖 8 電流同軸電纜接線(xiàn)方式</p> <p>　　2.電路連接接線(xiàn)方式</p> <p>　　功率耗損影響</p> <p>　　使用和負載匹配的接線(xiàn)方式可以降低功率損耗對測量精度的影響，以下是考慮電源和負載電阻的情況。參考前期微信文檔《功率測量?jì)x器的“特征阻抗”》中電流表?yè)p耗定義</p> <p>　　P=I2Ri</p> <p>　　電壓表?yè)p耗定義</p> <p>　　P=U2/RV</p> <p>　　，電壓表和電流表內阻乘積平方根暫且稱(chēng)為儀器的“功率特征阻抗”，當負載電阻RL>RP時(shí)，電壓表?yè)p耗大，推薦電流表內接法，當負載電阻RL</p> <p>　　舉例PA5000，電壓輸入阻抗Rv約2MΩ，電流輸入阻抗Ri約100mΩ，電流量程選擇1A，電壓量程選擇300V，電壓電流功耗函數圖 9，此時(shí)Rp=200，當負載電阻RL約大于447.2Ω時(shí)，推薦電流表內接，反之外接，示意圖圖 10。</p> <p>　　</p> <center><img alt="" width="500" height="190" src="http://editerupload.eepw.com.cn/201607/4677156058e13d6ac4da906a6d6c3460.jpg" /></center> <p> </p> <p align="center">　　圖 9 電壓電流表功率損耗函數圖</p> <p>　　</p> <center><img alt="" width="387" height="272" src="http://editerupload.eepw.com.cn/201607/f924dc3abe7f4cf9c29fef9f21397e8e.jpg" /></center> <p> </p> <p align="center">　　圖 10 內外接判定標準圖</p> <p>　　1)電流表外接---測量較大電流</p> <p>　　將電壓測量回路連到近負載一側。電流測量回路測得流經(jīng)負載的電流IL和流經(jīng)電壓測量回路的電流IU之和。因為測量回路電流為IL，所以誤差僅為IU，對測量精度的影響為IU/IL。</p> <p>　　</p> <center><img alt="" width="500" height="150" src="http://editerupload.eepw.com.cn/201607/8c9a1b046253fbd6959d924ce0829f75.jpg" /></center> <p> </p> <p align="center">　　圖 11 電流表外接圖</p> <p>　　2)電流表內接--測量小電流</p> <p>　　將電流測量回路接到近負載端。電壓測量回路測得的電壓等于負載電壓eL和電流表兩端的電壓eI之和。因為測量回路電壓為eL，誤差為eI。對測量精度的影響為RI/RL 。</p> <p>　　</p> <center><img alt="" width="500" height="155" src="http://editerupload.eepw.com.cn/201607/4727c347c1e066b63ce39218b491e7a2.jpg" /></center> <p> </p> <p align="center">　　圖 12 電流表內接</p></span>  <div class="ui1heu7" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" coords="133,235,319,253" target="_blank" /> <area shape="rect" 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