描述
萬(wàn)用表檢測(cè)電機(jī)的方法其實(shí)很簡(jiǎn)單。也就是霍爾傳感器的供電及信號(hào)線與電機(jī)的三條相線繞阻是絕緣的,電阻很大,當(dāng)電機(jī)有進(jìn)水時(shí),它們之間的絕緣電阻就變小了。因此用萬(wàn)用表的高電阻檔就能很方便的測(cè)量出電機(jī)是否進(jìn)水。萬(wàn)用表檢測(cè)電機(jī)的方法其實(shí)很簡(jiǎn)單。也就是霍耳傳感器的供電及信號(hào)線與電機(jī)的三條相線繞阻是絕緣的,電阻很大,當(dāng)電機(jī)有進(jìn)水時(shí),它們之間的絕緣電阻就變小了。因此用萬(wàn)用表的高電阻檔就能很方便的測(cè)量出電機(jī)是否進(jìn)水。注意以下幾點(diǎn):數(shù)值僅供參考企業(yè),會(huì)因?yàn)檫M(jìn)水的程度大小,及進(jìn)水的時(shí)間長(zhǎng)短不同而不同。當(dāng)測(cè)不出數(shù)值時(shí),即超量程顯示時(shí),則表示電機(jī)沒有進(jìn)水。另外應(yīng)當(dāng)注意的是,當(dāng)電機(jī)引線。用萬(wàn)用表測(cè)電機(jī)不太可靠,還是用搖表。用萬(wàn)用表測(cè)量電機(jī)的三個(gè)繞組的阻值是否一致。音響中電源濾波器主要是濾除電源中的雜波,使電源輸出平滑。這對(duì)于小功率電器如CD機(jī),DVD機(jī),前級(jí)等的音質(zhì)有所提高,主要表現(xiàn)在背景靜噪方面,如果用在汽車音響方面其效果就比較突出。如果是家用高級(jí)HIFI音響,那就千萬(wàn)不要使用電源濾波器,因?yàn)樗萍s了電流的輸出,效果反而不好,另外,電源濾波器如果用在視頻上,如電視,電腦,投影機(jī)等,其圖像聲音效果一流。
電源濾波器的作用就是減少電源干擾,而電源干擾可以分為兩類:普通模式和共通模式。普通模式是兩組輸入電源線之間的雜訊,這種雜訊通常是在關(guān)機(jī)和開機(jī)時(shí)產(chǎn)生。而共通模式是指因?yàn)槠鞑慕拥夭涣?又或是廣播無(wú)線電及冰箱馬達(dá)電磁、日光節(jié)能燈鎮(zhèn)流器、洗衣機(jī)、風(fēng)扇可控硅調(diào)速等引發(fā)的干擾!
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