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QJ57直流電阻電橋/直流雙臂電橋是采用凱兒文線路攜帶式精密型直流雙臂電橋。測量范圍0。01μΩ~1.111KΩ共分七個量程。由于內副指零儀，并能內裝工作電池，故除測量導線外不用任何附件就能進行測量。適合于工礦企業，科研單位的實驗室和車間現場乃至野外工地對各類低值直流電阻，如金屬導體的電導率，直流分流電阻，開關被觸電阻，線纜電阻以及各類電機，變壓器繞組的直流電阻等等作精密測量。</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;"> </span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">1．2 <strong style="white-space: normal;">QJ57直流電阻電橋</strong>主要電阻元件采用低溫度系數饒制而成，并經過嚴格的工藝處理和長期人工老練；靈敏度高，噪音小，耗電省。</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">1．主要技術指標。</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;"></span></p><div class="tabledivclass" style="margin: 0px; padding: 0px; list-style: none; border: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255); width: 99%; height: 235px;"><table border="1" cellpadding="0" cellspacing="0" align="left" width="456" style="border-spacing: 0px; max-width: 748px;"><tbody style="-webkit-tap-highlight-color: transparent; margin: 0px;"><tr class="firstRow" style="-webkit-tap-highlight-color: transparent; margin: 0px;"><td width="50" height="29" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: windowtext;"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">倍率</span></span></p></td><td width="108" height="29" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: windowtext windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">量程</span></span></p></td><td width="63" height="29" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: windowtext windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">分辨率</span></span></p></td><td width="99" height="29" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: windowtext windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">準確等級指數(C)</span></span></p></td><td width="72" height="29" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: windowtext windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">基準電阻(RN)</span></span></p></td><td width="63" height="29" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: windowtext windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">測試電流</span></span></p></td></tr><tr style="-webkit-tap-highlight-color: transparent; margin: 0px;"><td width="50" height="20" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext;"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">×10-3</span></span></p></td><td width="108" height="20" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">0~1.11110μΩ</span></span></p></td><td width="63" height="20" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">0.01μΩ</span></span></p></td><td width="99" height="20" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">2</span></span></p></td><td width="72" height="20" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">1 mΩ</span></span></p></td><td width="63" height="20" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">3．4A</span></span></p></td></tr><tr style="-webkit-tap-highlight-color: transparent; margin: 0px;"><td width="50" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext;"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">×10-2</span></span></p></td><td width="108" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">0~11.111Ωμ</span></span></p></td><td width="63" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">0.1μΩ</span></span></p></td><td width="99" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">0.2</span></span></p></td><td width="72" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">10 mΩ</span></span></p></td><td width="63" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">1．1A</span></span></p></td></tr><tr style="-webkit-tap-highlight-color: transparent; margin: 0px;"><td width="50" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext;"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">×10-1</span></span></p></td><td width="108" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">0~111.11Ωμ</span></span></p></td><td width="63" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">1mΩ</span></span></p></td><td rowspan="5" width="99" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">0.05</span></span></p></td><td width="72" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">100mΩ</span></span></p></td><td width="63" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">550mA</span></span></p></td></tr><tr style="-webkit-tap-highlight-color: transparent; margin: 0px;"><td width="50" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext;"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">×10</span></span></p></td><td width="108" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">0~1.1111Ωμ</span></span></p></td><td width="63" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">10mΩ</span></span></p></td><td width="72" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">1 Ω</span></span></p></td><td width="63" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">100mA</span></span></p></td></tr><tr style="-webkit-tap-highlight-color: transparent; margin: 0px;"><td width="50" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext;"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">×10</span></span></p></td><td width="108" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">0~11.111Ωμ</span></span></p></td><td width="63" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">100mΩ</span></span></p></td><td width="72" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">10Ω</span></span></p></td><td width="63" height="22" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">15mA</span></span></p></td></tr><tr style="-webkit-tap-highlight-color: transparent; margin: 0px;"><td width="50" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext;"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">×102</span></span></p></td><td width="108" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">0~111.11Ωμ</span></span></p></td><td width="63" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">1Ω</span></span></p></td><td width="72" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">100Ω</span></span></p></td><td width="63" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">1.5mA</span></span></p></td></tr><tr style="-webkit-tap-highlight-color: transparent; margin: 0px;"><td width="50" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext;"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">×103</span></span></p></td><td width="108" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">0~1.111kμ</span></span></p></td><td width="63" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">10Ω</span></span></p></td><td width="72" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">1 kΩ</span></span></p></td><td width="63" height="23" style="margin: 0px; -webkit-tap-highlight-color: transparent; background-color: transparent; border-color: rgb(236, 233, 216) windowtext windowtext rgb(236, 233, 216);"><p style="-webkit-tap-highlight-color: transparent; text-align: center;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px; font-family: arial, helvetica, sans-serif;"><span style="-webkit-tap-highlight-color: transparent; margin: 0px;">200μA</span></span></p></td></tr></tbody></table></div><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;"></span><br/></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">2．1QJ57直流電阻電橋/直流雙臂電橋</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">技術指標全部符合GB3930—83（測量電阻用支流電橋）標準，ZBY164—83 。</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">2．2主要參數：如表1所示：</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">2.3基本誤差允許：</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;"> Elim=±C%（RN/10+x）</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">式中：Elim:基本誤差允許， RN：基準值</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;"> C：準確度等級指數 X：測量盤示值</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">2.4使用環境條件：</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;"> a：參考值：20±0.5℃ 相對溫度:40%~60%</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">b:標稱值: 20±5℃ 相對溫度:20%~75%</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">2.5 指零儀</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">a:內附指零儀械和電氣調零裝置,,靈敏度可以調節。</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">b :阻尼時間不大于4秒。</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">c:靈敏度:電橋從平衡點開始，電阻值偏離一個等級數值時,指零儀指針偏轉應不小于1格.</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">d:噪音:指針抖動不大于1/3格.</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">e:在電橋背面電池盒內裝有外接指零儀插座.</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">2.6 電源:電橋工作電源為R40型1.5V干電池并聯使用,內附指零儀電源為6F22型9V干電池一節..</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">2.5 外型尺寸:30mm×250mm×160mm</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">2.8 質量:約6KG</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">3.<strong style="white-space: normal;">QJ57直流電阻電橋</strong>基本工作原理</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;"> </span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">QJ57型原理線路如圖1所示.電橋由培率臂,測量盤,指零儀和電源回路四部分組成。其中倍率臂由對稱的七對電阻組成，接在橋路的是定值標準電阻RS，接在電源回路的是限流電阻。測量盤由5步進盤組成，是典型的凱爾電路。</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">4．使用方法：</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">4．1準備。</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;"> 在電橋背面電池盒內按極性接入2節1號干電池和1節6F22型9V集成電池，將倍率開關由“斷"分別旋到“BV"和“GV"位置，電源電壓檢查：指零儀電表指針應進入線條區，表示電橋工作電池和指零儀電池電壓正常。預熱5分鐘之后，調節“調零"旋扭，使指針指“0"，講倍率盤和測量盤來回旋轉數次，以使開關，滑盤接觸良好。</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">4．2測量：</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">將被測電阻按四端扭法接入電橋的C1，P1，P2，C2接線柱，如圖2所示，其中AB之間為被測電阻。測量0.1Ω以下電阻時，測量用連接導線電阻應不大于0.01Ω。</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">估計被測電阻的大小，適當選擇倍率和測量盤，按下：“G"“B"按鈕同時調節測盤，使指零儀重新指零，此時電橋平衡，被測電阻Rx為：</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;"> Rx=倍率×測量盤示值</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">指零儀靈敏度開始時應放在較低位置，電橋初步平衡再提高，這樣既能縮短測量時間又可以防止指零儀指針的損壞。</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">4．3測量盤：為了使測量值有足夠的有效位數，應適當選擇倍率，使測量盤（最左邊）示值不為0，以確保測量的準確并有足夠的分辨力，其中測量盤左下方圓點為小數點，各測量盤上“X"符號表示值為10。</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">4．4外接電源和外接指零儀：</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;"> 當需要較長時間連續測量低值電阻時，建議采用外接電源供電，將電源選擇開關撥到：“B"外，外接電源按極性從“B"外接線柱接入。若測量時內附指零儀靈敏度不夠時，可以從G為接線柱接入高靈敏度外接指零儀，同時將選擇開關撥向“G外"</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">5．<strong style="white-space: normal;">QJ57直流電阻電橋</strong>注意事項</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">5．1測量0.1Ω以下電阻時“B"按鈕應間歇使用，以節約用電。在測量帶電感的直流電阻時，應先按“B"，再按“G"；斷開時，應放：“G"后放“B"</span></p><p style="padding: 0px; color: rgb(51, 51, 51); font-family: 宋體, Tahoma, Arial; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體; letter-spacing: 0px;">5．2在測量大中型變壓器線圈電阻時，必須將四根測量導線絞合在一起，以提高對電磁和地磁場的抗干擾能力，為了進一步提高抗干擾能力，接地“ "接線柱應與大地接地線相連。</span></p> </div> <div class="pagetb"> <p> 上一條：<a href="/Article-3024788.html">ZGF-A60KV2-3mA直流高壓發生器有幾種方式可實現快速極性轉換</a></p> <p> 下一條：<a href="/Article-3020883.html">QJ44直流雙臂電橋講解</a></p> </div> </div> </div> </div> <div class="footer"> <div class="foot"> <p>Copyright © 2025 上?？档请姎饪萍加邢薰?版權所有 <a target="_blank" rel="nofollow">備案號：滬ICP備16026206號-4</a> 傳真：86-021-51714615<br /> 技術支持：<a target="_blank" rel="nofollow">化工儀器網</a> <a href="/sitemap.xml" target="_blank" >sitemap.xml</a> <a target="_blank" rel="nofollow">管理登陸</a> 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