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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> <tr><th>品牌</th><td>康登電氣</td> <th></th><td></td></tr> </tbody> </table> </section><p>ZY5142型C/D 精密不平衡衰減器</p><p> </p><p> <strong>上?？档请姎饪萍加邢薰?/strong></p><p><strong>(50Ω)</strong></p>100%; padding:0px; width:737px; word-break:inherit"><table style="border-collapse:collapse; border-spacing:0px; border:1px solid rgb(168, 194, 159); color:rgb(71, 71, 71); font-family:nsimsun; font-size:12px; height:435px; line-height:normal; margin:0px; max-width:<font class=" color="red"> <tbody> <tr> <td><strong>簡述</strong></td> </tr> <tr> <td colspan="2"> <p><strong> 其特性阻抗（輸入、輸出）為 50 歐姆， dB 刻度。儀器適用于物理、電聲、通信等部門，用來作為衰減計量標準?？晒└魃a(chǎn)、維護單位及科研機關作為測試網(wǎng)絡的衰減和增益的標準，以及精密電平刻度的標準。</strong></p> </td> </tr> <tr> <td colspan="2"><strong> </strong></td> </tr> <tr> <td><strong><img alt="(50Ω)" src="https://img74.afzhan.com/" style="height:auto; margin:0px auto 5px !important; width:12px" /></strong></td> <td><strong>主要技術特性</strong></td> </tr> <tr> <td colspan="2">100%; padding:0px; width:721px; word-break:inherit"> <table border="1" style="border-collapse:collapse; border-spacing:0px; border:1px solid rgb(168, 194, 159); margin:0px; max-width:<font class=" color="red"> <tbody> <tr> <th scope="row"><strong>型號</strong></th> <td> <p><strong>ZY5142C</strong></p> </td> <td> <p><strong>ZY5142D</strong></p> </td> </tr> <tr> <th scope="row"><strong>頻率范圍</strong></th> <td colspan="2"> <p><strong>0～200kHz</strong></p> </td> </tr> <tr> <th scope="row"><strong>衰減范圍</strong></th> <td> <p><strong>0–131 dB</strong></p> </td> <td><strong>0–131.1dB</strong></td> </tr> <tr> <th scope="row"><strong>衰減組合</strong></th> <td colspan="2"><strong>20W</strong></td> </tr> <tr> <th scope="row"><strong>固定衰減范圍（分五檔）</strong></th> <td colspan="2"><strong>0.01dBx10（ZY5142D）、 0.1dBx10 、 1dBx10 、 10dBx6 、 60dBx1</strong></td> </tr> <tr> <th scope="row"><strong>準確度</strong></th> <td colspan="2"><strong>0.8% A ± 0.03dB （式中： A 為衰減量）</strong></td> </tr> <tr> <th scope="row"><strong>特征阻抗</strong></th> <td colspan="2"><strong>50Ω</strong></td> </tr> <tr> <th scope="row"><strong>zui小分辨率</strong></th> <td><strong>0.1dB</strong></td> <td><strong>0.01dB( 不計誤差 , 只視衰耗變化 )</strong></td> </tr> <tr> <th scope="row"><strong>輸入功率</strong></th> <td colspan="2"> <p><strong>zui大 1W</strong></p> </td> </tr> <tr> <th scope="row"><strong>質量</strong></th> <td colspan="2"><strong>約1.8Kg</strong></td> </tr> </tbody> </table> </td> </tr> 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