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background-color:="">4.1準(zhǔn)備：卸下電橋背面銘牌，在電池盒內(nèi)裝入2節(jié)1.5V2號(hào)干電池和1節(jié)6F22型9V疊層電池，裝上銘牌；檢查外接指零儀接線端鈕是否正確短接；對(duì)指零儀進(jìn)行機(jī)械調(diào)零，使指針與表面“0"線重合。<br/>4.2測(cè)量：將被測(cè)電阻器接到“RX"兩接線柱上，QJ23-單臂電橋估計(jì)被測(cè)電阻的阻值，適當(dāng)選擇倍率（比例臂），按下“B"和“G"按鈕（指零儀瞬間接通電源、并立即正常工作），調(diào)節(jié)測(cè)量盤(pán)（比較臂），使指零儀重新回零－電橋平衡，則被測(cè)電阻器阻值為：RX=倍率×測(cè)量盤(pán)示值</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " microsoft="" background-color:="">4.3外接電源：外接指零儀<br/>a外接電源：如需用外接電源時(shí)，先將電橋背面銘牌打開(kāi)，取出2號(hào)干電池；根據(jù)表2規(guī)定，按性從外接電源接線柱接入相應(yīng)電源。<br/>b.外接指零儀：若要提高測(cè)量精度，必須采用外接指零儀。用短路片將“內(nèi)接"兩接線柱短接，外接指零儀從“外接"兩接線柱接入。<br/>4.4電阻箱功能：將“B"和“G"按鈕復(fù)位，則G“外接"下端接線柱與“RX"右邊接線柱之間便可作為一個(gè)可調(diào)電阻箱，電阻值調(diào)節(jié)范圍為0~9999Ω。</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " microsoft="" background-color:="">QJ23單臂電橋工作原理：<br/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " microsoft="" background-color:="">3.1惠斯頓電橋（又稱單臂電橋）。QJ23型直流電阻電橋，電橋由倍率盤(pán)（比例臂）、測(cè)量盤(pán)（比較臂）、內(nèi)附指零儀及電源等部分組成。<br/>3.2測(cè)量盤(pán)（比較臂）有四組、每組以1、2、2、2、2五個(gè)電阻元件由開(kāi)關(guān)組合成0~9共10個(gè)示值，四組測(cè)量盤(pán)總調(diào)節(jié)范圍為0~9999；倍率盤(pán)（比例盤(pán)）采用差值式，總阻為1000Ω，由于倍率盤(pán)開(kāi)關(guān)接觸電阻歸到電源回路，故對(duì)測(cè)量精度沒(méi)有影響；按鈕“B"和“G"分別用于控制橋路電源和指零儀輸入信號(hào)；按鈕按下后旋轉(zhuǎn)90o可以鎖住，再旋轉(zhuǎn)90o可以復(fù)位。<br/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " microsoft="" background-color:=""><br/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " microsoft="" background-color:="">QJ23單臂電橋技術(shù)性能：</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " microsoft="" background-color:="">1.測(cè)量范圍</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " microsoft="" background-color:="">1Ω～9.999MΩ</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " microsoft="" background-color:="">2.準(zhǔn)確度：0.2%</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " microsoft="" background-color:="">3. 內(nèi)附指零儀：電流常數(shù)<6×10<sup>-5</sup>A/㎜，阻尼時(shí)間：<4s</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " microsoft="" background-color:="">4.電源：4.5V（2號(hào)干電池3節(jié)）</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " microsoft="" background-color:="">5.外型尺寸：225×175×115（㎜）</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " microsoft="" background-color:="">6.質(zhì)量：2㎏</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " microsoft="" background-color:="">各量程主要參數(shù)</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: " microsoft="" background-color:="">注：“*"代表為提高儀器靈敏度，需外接電源。</p><div id="ese6k6g28e" class="tabledivclass" style="width: 99%; float: left;"><table cellspacing="0" cellpadding="0" align="left" class="cke_show_border" style="border-spacing: 0px; border: 1px solid rgb(84, 141, 212); color: rgb(102, 102, 102); max-width: 748px;" microsoft="" background-color:="" height:="" width:="" max-width:=""><tbody><tr style="border: 1px solid rgb(84, 141, 212);" class="firstRow"><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>量程倍率</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>有效量程（Ω）</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>準(zhǔn)確度（%）</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>電源電壓（V）</p></td></tr><tr style="border: 1px solid rgb(84, 141, 212);"><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>X10<sup>-3</sup></p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>0~9.999</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>2</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>4.5</p></td></tr><tr style="border: 1px solid rgb(84, 141, 212);"><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>X10<sup>-2</sup></p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>0~99.99</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>0.2</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>4.5</p></td></tr><tr style="border: 1px solid rgb(84, 141, 212);"><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>X10<sup>-1</sup></p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>0~999.9</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>0.2</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>4.5</p></td></tr><tr style="border: 1px solid rgb(84, 141, 212);"><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>X1</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>0~9999</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>0.2</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>4.5</p></td></tr><tr style="border: 1px solid rgb(84, 141, 212);"><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>X10</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>0~99990</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>0.5</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>6*</p></td></tr><tr style="border: 1px solid rgb(84, 141, 212);"><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>X10<sup>2</sup></p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>0~999900</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>0.5</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>6*</p></td></tr><tr style="border: 1px solid rgb(84, 141, 212);"><td rowspan="2" style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>X10<sup>3</sup></p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>0~499900</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>2</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>21*</p></td></tr><tr style="border: 1px solid rgb(84, 141, 212);"><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>0~5999000</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>2</p></td><td style="margin: 0px; border: 1px solid rgb(84, 141, 212);"><p>36*</p></td></tr></tbody></table></div><p><br/></p> <div id="ese6k6g28e" class="pagetb"> <p> 上一條：<a 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