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style="font-family: Calibri;">1.</span><span style="font-family: 宋體;">干擾因素</span></span></p><p><span style="font-family: 宋體; font-size: 14px;"><span style="font-family: 宋體;">①與激勵電壓高低有關(guān)；</span></span></p><p><span style="font-family: 宋體; font-size: 14px;"><span style="font-family: 宋體;">②與變送器允許的最小工作電壓有關(guān)；</span></span></p><p><span style="font-family: 宋體; font-size: 14px;"><span style="font-family: 宋體;">③與板卡設(shè)備采集電流用的取壓電阻大小有關(guān)；</span></span></p><p><span style="font-family: 宋體; font-size: 14px;"><span style="font-family: 宋體;">④與導線電阻的大小有關(guān)。</span></span></p><p><span style="font-family: 宋體; font-size: 14px;"><span style="font-family: 宋體;">通過這四項有關(guān)量，可以計算出</span><span style="font-family: Calibri;">4-20mA</span><span style="font-family: 宋體;">電流信號的理論傳輸距離。</span></span></p><p><span style="font-family: 宋體; font-size: 14px;"><span style="font-family: Calibri;">2.</span><span style="font-family: 宋體;">要使</span><span style="font-family: Calibri;">4-20mA</span><span style="font-family: 宋體;">信號無損失在兩線回路里傳輸，必須滿足歐姆定律。</span></span></p><p><span style="font-family: 宋體; font-size: 14px;"><span style="font-family: 宋體;">即：（激勵電壓－變送器允許的最小工作電壓）</span><span style="font-family: 宋體;">≥輸出電流×電流環(huán)路總電阻</span></span></p><p><span style="font-family: 宋體; font-size: 14px;"><span style="font-family: 宋體;">當輸出電流</span><span style="font-family: Calibri;">I=20mA</span><span style="font-family: 宋體;">，即</span><span style="font-family: Calibri;">0.02A</span><span style="font-family: 宋體;">時，上式取等號，</span></span></p><p><span style="font-family: 宋體; font-size: 14px;"><span style="font-family: 宋體;">則：電流環(huán)路總電阻</span><span style="font-family: Calibri;">=</span><span style="font-family: 宋體;">（激勵電壓－變送器允許的最小工作電壓）÷</span><span style="font-family: Calibri;">0.02</span><span style="font-family: 宋體;">，將這個計算值記作</span><span style="font-family: Calibri;">r</span><span style="font-family: 宋體;">，即</span><span style="font-family: Calibri;">r=</span><span style="font-family: 宋體;">（激勵電壓－變送器允許的最小工作電壓）×</span><span style="font-family: Calibri;">50</span><span style="font-family: 宋體;">，單位Ω。</span></span></p><p><span style="font-family: 宋體; font-size: 14px;"><span style="font-family: 宋體;">這個</span><span style="font-family: Calibri;">r</span><span style="font-family: 宋體;">，業(yè)界稱之為電流信號的負載電阻，也就是電流信號的最大帶載能力。</span></span></p><p><strong><span style="font-family: 宋體; font-size: 14px;"><span style="font-family: 宋體;"> PH儀表電導率儀電阻率儀</span></span></strong></p><p> </p> </div> <div id="35hf15jpnp" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/szhcy-Article-3177229/">EDI超純水設(shè)備都有哪些優(yōu)勢？</a></li> <li>下一篇：<a href="/szhcy-Article-3169463/">你知道污泥烘干機的作用原理是怎樣的嗎？</a></li> </ul> </div> </div>   <div id="35hf15jpnp" class="foot_box"> <div id="35hf15jpnp" class="foot_t"> <div id="35hf15jpnp" class="w1200"> <a href="/">網(wǎng)站首頁</a>　|　<a href="/aboutus.html">關(guān)于我們</a>　|　<a href="/products.html">產(chǎn)品中心</a>　|　<a href="/news.html">新聞動態(tài)</a>　|　<a 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