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QJ44直流雙臂電橋使線路和和結(jié)構(gòu)</div> <div id="1571n5fppxr7" class="inpage_content"> <div id="1571n5fppxr7" class="nr_main_box"> <h1 class="inside_rnewtil">QJ44直流雙臂電橋使線路和和結(jié)構(gòu)</h1> <div id="1571n5fppxr7" class="inside_rnewtime">點(diǎn)擊次數(shù)：1773 更新時間：2018-01-06</div> <div id="1571n5fppxr7" class="inside_rnewcon"><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:18px"><strong>QJ44直流雙臂電橋使</strong></span><span style="font-size:12pt"><span style="font-family:宋體">線路和和結(jié)構(gòu)</span></span></p><p style="margin-left:24.05pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">1、QJ44雙臂電橋面板位置圖</span></span></p><p style="margin-left:0pt; margin-right:0pt"> <img src="http://img50.chem17.com/9/20180106/636508321734951778979.png" style="height:243px; width:301px" /></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">(1) 電橋外接工作電源接線柱 (2) 檢流計靈敏度調(diào)節(jié)旋鈕；</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">(3) 晶體管檢流計工作電源開關(guān) (4) 滑線讀數(shù)盤；</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">(5) 步進(jìn)讀數(shù)開關(guān) (6) 檢流計按鈕開關(guān)；</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">(7) 電橋工作電源按鈕開關(guān) (8) 被測電阻電流端接線柱 </span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">(9) 量程因素讀數(shù)開關(guān) (10) 被測電阻電位端接線柱</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">(11) 檢流計電氣調(diào)零旋鈕 (12) 被測電阻電流端接線柱</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">(13) 檢流計指示表頭</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">2、電橋線路：</span></span></p><p style="margin-left:0pt; margin-right:0pt"> <img src="http://img48.chem17.com/9/20180106/636508324200859585960.png" style="height:289px; width:383px" /></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">四、</span></span><span style="font-size:18px"><strong>QJ44直流雙臂電橋使</strong></span><span style="font-size:12pt"><span style="font-family:宋體">使用方法</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">1、在電池盒內(nèi)，裝入1.5V1號手電筒電池4~6節(jié)并聯(lián)使用和2節(jié)6F22、9V并聯(lián)使用，此時電橋就能正常工作。如用外接直流電源1.5~2V時，電池盒內(nèi)的1.5V電池，應(yīng)預(yù)先全部取出。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">2、“B</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">1</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">”開關(guān)扳到通位置，等穩(wěn)定后（約5分鐘），調(diào)節(jié)檢流計指針在零位。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">3、靈敏度旋鈕放在zui低位置。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">4、將被測電阻，按四端連接法，接在電橋相應(yīng)的C</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">1</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、P</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">1</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、P</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">2</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、C</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">2</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、的接線柱上。如下圖所示，AB之間為被測電阻。</span></span></p><p style="margin-left:31.5pt; margin-right:0pt"> <img src="http://img48.chem17.com/9/20180106/636508324832663635444.png" style="height:103px; width:261px" /></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">5、估計被測電阻值大小，選擇適當(dāng)倍率位置，先按“G”按鈕，再按“B”按鈕，調(diào)節(jié)步進(jìn)讀數(shù)和滑線讀數(shù)，使檢流計指針在零位上。如發(fā)現(xiàn)檢流計靈敏度不夠，應(yīng)增加其靈敏度，移動滑線盤4小格，檢流計指針偏離零位約1格，就能滿足測量要求。在改變靈敏度時，會引起檢流計指針偏離零位，在測量之前，隨時都可以調(diào)節(jié)檢流計零位。被測電阻按下式計算：</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">被測電阻值=倍率讀數(shù)×（步進(jìn)讀數(shù)+滑線讀數(shù)）</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">被測電阻范圍與倍率位置選擇按下表：</span></span></p><table style="border-collapse:collapse; border:1px dotted rgb(211, 211, 211); color:rgb(51, 51, 51); font-family:sans-serif,arial,verdana,trebuchet ms; font-size:13px; margin-left:60.6pt; width:444px"><tbody><tr><td style="width:192px"><p style="margin-left:0pt; margin-right:0pt; text-align:center"><span style="font-size:12pt"><span style="font-family:宋體">倍率</span></span></p></td><td style="width:252px"><p style="margin-left:0pt; margin-right:0pt; text-align:center"><span style="font-size:12pt"><span style="font-family:宋體">被測電阻范圍（Ω）</span></span></p></td></tr><tr><td style="width:192px"><p style="margin-left:0pt; margin-right:0pt; text-align:center"><span style="font-size:12pt"><span style="font-family:宋體">×100</span></span></p></td><td style="width:252px"><p style="margin-left:0pt; margin-right:0pt; text-align:center"><span style="font-size:12pt"><span style="font-family:宋體">1.1~11</span></span></p></td></tr><tr><td style="width:192px"><p style="margin-left:0pt; margin-right:0pt; text-align:center"><span style="font-size:12pt"><span style="font-family:宋體">×10</span></span></p></td><td style="width:252px"><p style="margin-left:0pt; margin-right:0pt; text-align:center"><span style="font-size:12pt"><span style="font-family:宋體">0.11~1.1</span></span></p></td></tr><tr><td style="width:192px"><p style="margin-left:0pt; margin-right:0pt; text-align:center"><span style="font-size:12pt"><span style="font-family:宋體">×1</span></span></p></td><td style="width:252px"><p style="margin-left:0pt; margin-right:0pt; text-align:center"><span style="font-size:12pt"><span style="font-family:宋體">0.011~0.11</span></span></p></td></tr><tr><td style="width:192px"><p style="margin-left:0pt; margin-right:0pt; text-align:center"><span style="font-size:12pt"><span style="font-family:宋體">×0.1</span></span></p></td><td style="width:252px"><p style="margin-left:0pt; margin-right:0pt; text-align:center"><span style="font-size:12pt"><span style="font-family:宋體">0.0011~0.011</span></span></p></td></tr><tr><td style="width:192px"><p style="margin-left:0pt; margin-right:0pt; text-align:center"><span style="font-size:12pt"><span style="font-family:宋體">×0.01</span></span></p></td><td style="width:252px"><p style="margin-left:0pt; margin-right:0pt; text-align:center"><span style="font-size:12pt"><span style="font-family:宋體">0.00001~0.0011</span></span></p></td></tr></tbody></table><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">QJ44型晶體管檢流計簡易修理</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">晶體管檢流計常見故障有以下幾種：不工作、靈敏度低、調(diào)零調(diào)不到零等等。如果有條件，可以用示波器、毫伏表、訊號發(fā)生器等電子儀器來檢查故障。在這里我們只介紹簡易的檢修方法，供在修理時參考。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">一、對分法</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">在修理時，有些同志感到無從下手，或是無目的地焊這拆那，往往故障未查出，反把好的元件弄壞。用對分法檢查故障，即能避免全</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">面檢查而浪費(fèi)時間，又能不至無故損壞元件。所謂對分法，即在故障范圍中，選擇一點(diǎn)進(jìn)行檢查，判別故障發(fā)生在此點(diǎn)前，還是在此點(diǎn)后，這樣就能肯定一半，然后在剩下的故障范圍內(nèi)，再找一點(diǎn)進(jìn)行檢查，按此方法檢查下去，就會很快地找到故障所在點(diǎn)。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">1、例如在電源、表頭和訊號輸入均*的情況下；晶體管檢流計不工作。用對分法來檢查故障，在圖1中，選擇(5)點(diǎn)作為檢查點(diǎn)，調(diào)節(jié)W，如果表頭指針相應(yīng)會偏轉(zhuǎn)，則來自振蕩器的訊號能從(6)點(diǎn)（BG</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">3</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">發(fā)射極）輸入而進(jìn)行放大、解調(diào)，可見振蕩器，解調(diào)器的工作正常。而交流放大器是一個整體，BG</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">2</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">—BG</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">5</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">也不會有問題。顯然故障一下就縮小到調(diào)制器所屬范圍內(nèi)。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">2、如果調(diào)節(jié)W，表頭指針無反應(yīng)，或反應(yīng)不明顯，則問題在調(diào)制以外的回路中，再選(4)點(diǎn)，解調(diào)器輸入端，用一導(dǎo)線，一頭接觸(4)點(diǎn)，另一頭分別與(7)和(8)兩點(diǎn)相接觸，如果表頭指針相應(yīng)打向兩邊，則解調(diào)器和振蕩器工作正常，故障發(fā)生在交流放大器內(nèi)。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">3、在剩下的振蕩器和解調(diào)器中選擇(9)和(10)兩點(diǎn)，用萬用表交流電壓檔測量以上兩對地之間的交流電壓，若分別約1V和1.5V，表明振蕩器工作正常。zui后只需檢查解調(diào)器就是了。檢查解調(diào)器除了檢查電路是否有假焊外，主要判別場效應(yīng)管是否損壞。也可檢查(7)和(8)兩點(diǎn)對地電壓，用萬用表測量時，須串接一個5μF以上電容。如果兩點(diǎn)對地電壓很低，或其中一點(diǎn)不正常，則振蕩器可能正常，而調(diào)制或解調(diào)中場效應(yīng)管柵極嚴(yán)重漏電。如果(7)和(8)兩點(diǎn)對地?zé)o電壓，再用直流電壓表測(7)和(8)對地直流電壓，就可查出故障點(diǎn)。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">二、也可以用訊號注入法檢查晶體管檢流計</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">在被修理印刷板上找到圖1所示各對應(yīng)點(diǎn)。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">1、將一手指觸及(1)，另一手指觸及(11)，此時表頭指針打向一邊，</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">說明直流正電壓能從(1)輸入，(1)以后所有電路均無問題，而檢修(1)以前的線路是十分簡單的。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">2、如果直流信號輸不進(jìn)，則用交流輸入：將一手指觸及(2)或(3)，另一手指先后觸及(7)和(8)，此時表頭指針應(yīng)分別打向兩邊。如果觸及(7)和(8)，表頭指針向一個方向偏轉(zhuǎn)，而另一方向無指示，則問題在解調(diào)器。表頭指針無指示，則問題在交流放大器和解調(diào)器線路中。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">三、電流電壓測量法</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">用萬用表測量晶體管檢流計總電流約0.8mA（電源電壓在9V時），也可以測量交流放大器的各點(diǎn)工作電壓和振蕩器輸出電壓來判斷。如果測量數(shù)值與典型數(shù)據(jù)偏差太大，說明線路有問題。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">四、</span></span><span style="font-size:18px"><strong>QJ44直流雙臂電橋使</strong></span><span style="font-size:12pt"><span style="font-family:宋體">修理注意事項</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">1、在修理晶體管檢流計時，可用以上三種方法來確定故障點(diǎn)。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">2、在焊接3DO2場效應(yīng)管時，烙鐵應(yīng)很好接地，斷電焊接。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">3、在檢查元件時，應(yīng)重點(diǎn)檢查場效應(yīng)管是否損壞，電容器容量誤差無關(guān)緊要，而對電容器漏電要求較高，檢測元件方法請參閱有關(guān)資料。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">4、焊接元件時，應(yīng)使用24W烙鐵，并防止印刷板線條短路和翹起。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">5、晶體管檢流計原理圖和裝配圖中所標(biāo)晶體管型號僅供參考。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><img src="http://img49.chem17.com/9/20180106/636508325212682071489.png" style="height:387px; width:532px" /> </p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">五、</span></span><span style="font-size:18px"><strong>QJ44直流雙臂電橋使</strong></span><span style="font-size:12pt"><span style="font-family:宋體">注意事項和維護(hù)保養(yǎng)</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">1、在測電感電路的直流電阻時，應(yīng)先按下“B”按鈕，再按下“G”按鈕，斷開時，應(yīng)先斷開“G”按鈕，后斷開“B”按鈕。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">2、測量0.1Ω以下阻值時，“B”按鈕應(yīng)間歇使用。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">3、在測量0.1Ω以下阻值時，C</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">1</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、P</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">1</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、P</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">2</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、C</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">2</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、接線柱到被測量電阻之間的連接導(dǎo)線電阻為0.005Ω~0.01Ω；測量其它阻值時，連接導(dǎo)線電阻可不大于0.05Ω。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">4、電橋使用完畢后，“B”與“G”按鈕應(yīng)松開。“B</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">1</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">”開關(guān)應(yīng)扳向“斷”位置，避免浪費(fèi)晶體管檢流計放大工作電源。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">5、如電橋長期擱置不用，應(yīng)將電池取出。</span></span></p><p style="margin-left:0pt; margin-right:0pt"><span style="font-size:12pt"><span style="font-family:宋體">6、如電橋長期擱置不用，在接觸處可能產(chǎn)生氧化，造成接觸不良，使接觸良好，再涂上一薄層無酸性凡士林，予以保護(hù)。</span></span></p></div> <div id="1571n5fppxr7" class="inside_newsthree"> <p id="newsprev">上一篇：<b class="newsprev"><a href="/Article-1440689.html">接線柱技術(shù)參數(shù)</a></b></p> <p id="newsnext">下一篇：<b class="newsnext"><a href="/Article-1440682.html">QJ44直流雙臂電橋使用方法修理注意事項</a></b></p> <span><a href="/article.html">返回列表>></a></span> </div> </div> </div> </div> </div>    <div class="1571n5fppxr7" id="z_Footer"> <div id="1571n5fppxr7" class="pz_down"> <div id="1571n5fppxr7" class="w_1200"> <div id="1571n5fppxr7" class="footT"> <div id="1571n5fppxr7" class="footAddr"> <div id="1571n5fppxr7" class="footTit">上?？档请姎饪萍加邢薰?/div> <div id="1571n5fppxr7" class="dAddr"><img class="ico" src="/Skins/334632/images/icon_foot1.png">地址：上海市普陀區(qū)金通路1118弄6號</div> <div id="1571n5fppxr7" class="dAddr"><img class="ico" src="/Skins/334632/images/icon_foot2.png">電話：21-51097529/021-51098529</div> <div id="1571n5fppxr7" 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