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style="font-size:16px;">数字万用表由于具有测量精¼‹®ã€å–值方ä¾Ñ€åŠŸèƒ½é½å…¨ç­‰ä¼˜ç‚¹åQŒå› æ­¤æ·±å—æ— ¾U¿ç”µçˆ±å¥½è€…çš„‹Æ¢è¿Žã€æœ€æ™®é€šçš„数字方用表一般具有电é˜ÀLµ‹é‡ã€é€šæ–­å£°å“‹‚€‹¹‹ã€äºŒæžç®¡æ­£å‘导通电压测量。交‹¹ç›´‹¹ç”µåŽ‹ç”µ‹¹æµ‹é‡ã€ä¸‰æžç®¡æ”‘Ö¤§å€æ•°åŠæ€§èƒ½‹¹‹é‡½{‰ã€‚有些数字万用表则增加了电容定w‡‹¹‹é‡ã€é¢‘率测量、温度测量、数据记忆及语音报数½{‰åŠŸèƒ½ï¼Œ¾l™å®žé™…检‹¹‹å·¥ä½œå¸¦æ¥å¾ˆå¤§çš„方便。但是,数字方用表由于ä‹É用不当,在实际检‹¹‹æ—¶æ˜“造成表内元äšg损坏åQŒäñ”生故障ã€?/span><br /> <span style="font-size:16px;">数字万用表损坏在大多数情况下是因‹¹‹é‡æ¡£ä½é”™è¯¯é€ æˆåQŒå¦‚在测量交‹¹å¸‚甉|—¶åQŒæµ‹é‡æ¡£ä½é€‰æ‹©¾|®äºŽç”µé˜»æŒ¡ï¼Œ˜q™ç§æƒ…况下表½W”一旦接触市电,瞬间卛_¯é€ æˆä¸‡ç”¨è¡¨å†…部元件损坏。因此,在ä‹É用万用表‹¹‹é‡å‰ä¸€å®šè¦å…ˆæ£€æŸ¥æµ‹é‡æ¡£ä½æ˜¯å¦æ­£¼‹®ã€‚在使用完毕åQŒå°†‹¹‹é‡é€‰æ‹©¾|®äºŽäº¤æµ750V或者直‹¹?000V处,˜q™æ ·åœ¨ä¸‹‹Æ¡æµ‹é‡æ—¶æ— è®ºè¯¯æµ‹ä»€ä¹ˆå‚敎ͼŒéƒ½ä¸ä¼šå¼•èµäh•°å­—万用表损坏.</span><br /> <span style="font-size:16px;">有些数字万用表损坏是ç”׃ºŽ‹¹‹é‡çš„电压电‹¹è¶…˜q‡é‡½E‹èŒƒå›´æ‰€é€ æˆçš?如在交流20V档位‹¹‹é‡å¸‚电åQŒå¾ˆæ˜“引èµäh•°å­—万用表交流攑֤§ç”µèµ\损坏åQŒä‹É万用表失åŽÖMº¤‹¹æµ‹é‡åŠŸèƒ½ã€‚在‹¹‹é‡ç›´æµç”µåŽ‹æ—Óž¼Œæ‰€‹¹‹ç”µåŽ‹è¶…出测量量½E‹ï¼ŒåŒæ ·æ˜“造成表内电èµ\故障。在‹¹‹é‡ç”‰|µæ—¶å¦‚果实际电‹¹å€ÆD¶…˜q‡é‡½E‹ï¼Œä¸€èˆ¬ä»…引è“v万用表内的保险丝烧断åQŒä¸ä¼šé€ æˆå…¶å®ƒæŸåã€‚所以在‹¹‹é‡ç”µåŽ‹å‚æ•°æ—Óž¼Œå¦‚果不知道所‹¹‹ç”µåŽ‹çš„大致范围åQŒåº”先把‹¹‹é‡æ¡£ç½®äºŽæœ€é«˜æ¡£åQŒé€šè¿‡‹¹‹é‡å…¶å€¼åŽå†æ¢æ¡£æµ‹é‡ï¼Œä»¥å¾—到比较精¼‹®çš„数倹{€‚如果所要测量的电压数å€ÆD¿œ­‘…出万用表所能测量的最大量½E‹ï¼Œåº”另配高é˜ÀLµ‹é‡è¡¨½W”。如‹‚€‹¹‹é»‘白彩ç”늚„½W¬äºŒé˜Ïxžé«˜åŽ‹åŠèšç„¦é«˜åŽ‹ã€?/span><br /> <span style="font-size:16px;">多数数字万用表的直流电压上限量程ä¸?000VåQŒå› æ­¤æµ‹é‡ç›´‹¹ç”µåŽ‹æ—¶åQŒæœ€é«˜ç”µåŽ‹å€¼åœ¨1000V以下åQŒä¸€èˆ¬ä¸ä¼šæŸåä¸‡ç”¨è¡¨ã€‚如果超å‡?000VåQŒåˆ™å¾ˆæœ‰å¯èƒ½é€ æˆä¸‡ç”¨è¡¨æŸåã€‚但是,不同的数字万用表的可‹¹‹é‡ç”µåŽ‹ä¸Šé™å€¼å¯èƒ½æœ‰æ‰€ä¸åŒã€‚如果测量的电压­‘…出量程åQŒå¯é‡‡å–电阻降压的方法加以测量。另外,在测é‡?0Oï½?000V的直‹¹é«˜ç”µåŽ‹æ—Óž¼Œè¡¨ç¬”与测量处一定要接触好,不能有ä“Q何抖动,否则åQŒé™¤äº†å¯èƒ½ä¼šé€ æˆä¸‡ç”¨è¡¨æŸåè€Œä‹É‹¹‹é‡ä¸å‡†¼‹®å¤–åQŒä¸¥é‡æ—¶˜q˜å¯ä½¿ä¸‡ç”¨è¡¨æ— ä“Q何显½Cºï¼Œåœ¨æµ‹é‡ç”µé˜ÀL—¶åQŒåº”注意一定不要带甉|µ‹é‡ã€?nbsp;                                                                                                                                                     <img style="max-width:100%;" src="/uploads/image/20221118/20221118173237_9966.jpg" alt="数字万用è¡? width="500" height="500" title="数字万用è¡? align="" /></span> </p></p> </div> <p><div>上一æ?<a href="479.html">【知识】直‹¹ç¨³å®šç”µæºè{换器发展未来 直流½E›_®šç”‰|ºå“è´¨é«˜ç«¯</a></div> <div>下一æ?<a href="477.html">信号发生器的原理和ä‹Éç”?/a></div> </p> </div> <div 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