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class="yj"><a href="/ParentList-1935169.html" class="yja" onmouseover="showsubmenu('高壓核相儀')">高壓核相儀</a> <div class="quimsyk" id="submenu_高壓核相儀" style="display:none"> <ul> </ul> </div> </li> </ul> </div> </div></div> <div id="quimsyk" class="inpage_right"> <div id="quimsyk" class="mbx2"><a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > QJ44直流雙臂電橋使用方法</div> <div id="quimsyk" class="inpage_content"> <div id="quimsyk" class="nr_main_box"> <h1 class="inside_rnewtil">QJ44直流雙臂電橋使用方法</h1> <div id="quimsyk" class="inside_rnewtime">點(diǎn)擊次數(shù)：11230 更新時間：2020-03-01</div> <div id="quimsyk" class="inside_rnewcon"><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">QJ44直流雙臂電橋<span style="color:rgb(51, 51, 51); font-family:????">與直流單臂電橋相比，直流雙臂電橋由于采用四線制測量，能夠消除接線電阻和接觸電阻對測量結(jié)果的影響。QJ44直流雙臂電橋在實(shí)際中專門用來精密測量1Ω以下的小電阻。如用于測量金屬棒、電纜、導(dǎo)線、金屬導(dǎo)體的電阻值，檢查電流匯流排、金屬殼體等焊接質(zhì)量的好壞，對開關(guān)電器接觸電阻的測定，對低阻標(biāo)準(zhǔn)電阻、直流分流器等的校驗(yàn)和調(diào)整，對各類型電機(jī)、變壓器繞組的直流電阻測量和溫升實(shí)驗(yàn)等。</span></span></p><p><span style="font-size:16px">　　QJ44直流雙臂電橋的使用方法：</span></p><p><span style="font-size:16px">　　1.使用前，先把檢流計(jì)的鎖扣打開，并調(diào)節(jié)調(diào)零器把指針調(diào)到零位。</span></p><p><span style="font-size:16px">　　2.估計(jì)被測電阻近似值，然后參照說明書上的表格選擇適當(dāng)?shù)谋壤郏ū堵剩?，使比例臂可調(diào)電阻的各檔能夠充分利用，以提高其精度。</span></p><p><span style="font-size:16px">　　3.接入電阻時，應(yīng)選擇較粗較短的連接導(dǎo)線，并將接頭擰緊，減小導(dǎo)線電阻及接觸電阻，盡量提高測量精度。</span></p><p><span style="font-size:16px">　　4.在測量電感電路的電阻（電機(jī)、變壓器等）時，應(yīng)先接通電源按鈕，后接通檢流計(jì)按鈕。測量結(jié)束后，應(yīng)先斷開檢流計(jì)按鈕，再斷開電源按鈕，以免線圈的自感電動勢損壞檢流計(jì)。</span></p><p><span style="font-size:16px">　　5.電橋電路接通后，如檢流計(jì)指針向“+”的方向偏轉(zhuǎn)，應(yīng)增加比較臂的電阻；反之，如指針向“-”的方向偏轉(zhuǎn)，則應(yīng)減小比較臂的電阻。反復(fù)調(diào)節(jié)比較臂電阻使指針指向零位為止。讀出刻度盤電阻值再乘以倍率，即為所測電阻值。</span></p><p><span style="font-size:16px">　　6.電橋使用完畢后，應(yīng)立即將檢流計(jì)的鎖扣鎖上，以免在搬動過程中，將懸絲震壞。</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">體管檢流計(jì)簡易修理：</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">晶體管檢流計(jì)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></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">對分法：</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">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></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">1、例如在電源、表頭和訊號輸入均*的情況下；晶體管檢流計(jì)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)（BG3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，BG2—BG5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></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">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></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">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。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></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">也可以用訊號注入法檢查晶體管檢流計(jì)：</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">在被修理印刷板上找到圖 1 所示各對應(yīng)點(diǎn)。</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">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，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></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">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></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px"><strong>QJ44型<strong>直流雙臂電橋使用方法</strong></strong>電橋線路：</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px"><img alt="" src="http://img68.chem17.com/9/20190424/636917030057589698798.png" style="border:0px; height:420px; margin:0px; padding:0px; vertical-align:top; width:553px" /></span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px"><strong>QJ44型<strong>直流雙臂電橋使用方法</strong>：</strong></span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">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></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">2、“B1”開關(guān)扳到通位置，等穩(wěn)定后（約 5 分鐘），調(diào)節(jié)檢流計(jì)指針在零位。</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">3、靈敏度旋鈕放在低位置。</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">4、將被測電阻，按四端連接法，接在電橋相應(yīng)的C1、P1、P2、C2、的接線柱上。如下圖所示，AB之間為被測電阻。</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px"><img alt="" src="http://img68.chem17.com/9/20190424/636917030269596416401.png" style="border:0px; height:256px; margin:0px; padding:0px; vertical-align:top; width:554px" /></span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">5、估計(jì)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(jì)指針在零位上。如發(fā)現(xiàn)檢流計(jì)靈敏度不夠，應(yīng)增加其靈敏度，移動滑線盤 4 小格，檢流計(jì)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(jì)指針偏離零位，在測量之前，隨時都可以調(diào)節(jié)檢流計(jì)零位。被測電阻按下式計(jì)算：</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">被測電阻值=倍率讀數(shù)×（步進(jìn)讀數(shù)+滑線讀數(shù)）</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">被測電阻范圍與倍率位置選擇按下表：</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">倍率被測電阻范圍（Ω）</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">×100 1.1~11</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">×10 0.11~1.1</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">×1 0.011~0.11</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">×0.1 0.0011~0.011</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">×0.01 0.00001~0.0011 </span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">注意事項(xiàng)和維護(hù)保養(yǎng)：</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">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></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">2、測量 0.1Ω 以下阻值時，“B”按鈕應(yīng)間歇使用。</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">3、在測量 0.1Ω以下阻值時，C1、P1、P2、C2、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></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">4、電橋使用完畢后，“B”與“G”按鈕應(yīng)松開。“B1”開關(guān)應(yīng)扳向“斷”位置，避免浪費(fèi)晶體管檢流計(jì)放大工作電源。</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">5、如電橋長期擱置不用，應(yīng)將電池取出。</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">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></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">7、電橋應(yīng)貯放在環(huán)境溫度+5℃~+45℃，相對濕度小于 30%的條件下，室內(nèi)空氣中不應(yīng)含有能腐蝕儀器的氣體和有害雜質(zhì)。</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">8、儀器應(yīng)保持清潔，并避免直接曝曬和劇烈震動。</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span style="font-size:16px">9、儀器在使用中，如發(fā)現(xiàn)檢流計(jì)靈敏度顯著下降，可能因電池壽命完畢引起，因更換新的電池。</span></p><p style="margin: 0px; padding: 0px; line-height: 25px; font-family: tahoma; color: rgb(102, 102, 102); font-size: 14px;"><span 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