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class="NyNewsdetail_con"> <p> <strong><span style="font-family: 宋體; font-size: 14px;"><span style="font-family: 宋體;">儀表</span></span></strong><span style="font-family: 宋體; font-size: 14px;"><span style="font-family: 宋體;"></span><span style="font-family: Calibri;">4-20mA</span><span style="font-family: 宋體;">電流環(huán)是可以分為兩線制和三線制的，下面請(qǐng)大家跟小編一起計(jì)算一下吧。</span></span></p><p><span style="font-family: 宋體; font-size: 14px;"><span 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(lì)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(dǎo)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(xiàng)有關(guān)量，可以計(jì)算出</span><span style="font-family: Calibri;">4-20mA</span><span style="font-family: 宋體;">電流信號(hào)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(hào)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(lì)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(dāng)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(shí)，上式取等號(hào)，</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(lì)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(gè)計(jì)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(lì)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(gè)</span><span style="font-family: Calibri;">r</span><span style="font-family: 宋體;">，業(yè)界稱之為電流信號(hào)的負(fù)載電阻，也就是電流信號(hào)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;"> 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