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用萬能表檢測電路板
1.離線檢測
測出IC芯片各引腳對地之間的正,反電阻值.以此與好的IC芯片
進行比較,從而找到故障點.
2.在線檢測
1)直流電阻的檢測法
同離線檢測.但要注意:
(a)要斷開待測電路板上的電源;
(b)萬能表內(nèi)部電壓不得大于6V;
(c)測量時,要注意外圍的影響.如與IC芯片相連的電位器等.
2)直流工作電壓的測量法
測得IC芯片各腳直流電壓與正常值相比即可.但也要注意：
(a)萬能表要有足夠大的內(nèi)阻,數(shù)字表為;
(b)各電位器旋到中間位置;
(c)表筆或探頭要采取防滑措施,可用自行車氣門芯套在筆頭上,
并應長出筆尖約5mm;
(d)當測量值與正常值不相符時,應根據(jù)該引腳電壓,對IC芯片正
常值有無影響以及其它引腳電壓的相應變化進行分析;
(e)IC芯片引腳電壓會受外圍元器件的影響.當外圍有漏電,短路,
開路或變質(zhì)等;
(f)IC芯片部分引腳異常時,則從偏離大的入手.先查外圍元器件,
若無故障,則IC芯片損壞;
(g)對工作時有動態(tài)信號的電路板,有無信號IC芯片引腳電壓是不
同的.但若變化不正常則IC芯片可能已壞;
(h)對多種工作方式的設備,在不同工作方式時IC腳的電壓是不同
的.
3)交流工作電壓測試法
用帶有dB檔的萬能表,對IC進行交流電壓近似值的測量.若沒有dB
檔,則可在正表筆串入一只0.1-0.5μF隔離直流電容.該方法適用
于工作頻率比較低的IC.但要注意這些信號將受固有頻率,波形不
同而不同.所以所測數(shù)據(jù)為近似值,僅供參考.
4)總電流測量法
通過測IC電源的總電流,來判別IC的好壞.由于IC內(nèi)部大多數(shù)為直
流耦合,IC損壞時(如PN結(jié)擊穿或開路)會引起后級飽和與截止,使
總電流發(fā)生變化.所以測總電流可判斷IC的好壞.在線測得回路電
阻上的電壓,即可算出電流值來.
以上檢測方法,各有利弊.在實際應用中將這些方法結(jié)合來運用.運用好了
就能維修好各種電路板。
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峰會上嘉賓云集，施耐德電氣中國區(qū)副總裁李繼敏先生開場致詞，施耐德電氣全球能源化工行業(yè)總裁Astrid POUPART-LAFARGE特地以視頻方式發(fā)表了演講，來自行業(yè)、業(yè)內(nèi)專家、戰(zhàn)略部、能源管理低壓業(yè)務、中壓業(yè)務、關鍵電源業(yè)務、數(shù)字能效業(yè)務、工業(yè)自動化過程自動化業(yè)務、數(shù)字化業(yè)務、變頻業(yè)務，服務部的14位專家們分享了在化工油氣行業(yè)的洞見和解決方案。
峰會上，施家重磅發(fā)布了九本化工油氣行業(yè)系列白皮書，為化工油氣行業(yè)提供“安全無虞、可靠穩(wěn)定、協(xié)同增效、綠色可持續(xù)”四大價值，聚焦數(shù)字化浪潮下，企業(yè)的轉(zhuǎn)型與增長之徑。
“此次發(fā)布的行業(yè)應用系列白皮書，施耐德電氣基于詳實的數(shù)據(jù)及深刻的行業(yè)洞察，并結(jié)合自身在創(chuàng)新及數(shù)字化方面的豐富經(jīng)驗，對當前行業(yè)發(fā)展面臨的痛點問題及未來發(fā)展趨勢進行了深入剖析，并為行業(yè)終端用戶及生態(tài)圈伙伴提供了兼具洞察力、前瞻性、系統(tǒng)性以及可復制性的應用、架構(gòu)和解決方案，以期通過自身在電力管理、過程自動化以及軟件方面的強大實力，賦能行業(yè)高質(zhì)量發(fā)展。”
——江瀅
施耐德電氣能源管理低壓業(yè)務行業(yè)市場負責人
| SNAP-AIARMS |
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| SNAP-B12M |
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| SNAP-B12MCP |
| SNAP-B16M |
| SNAP-B16MC |
| SNAP-B16MCP |
| SNAP-B4M |
| SNAP-B8M |
| SNAP-B8MC |
| SNAP-BRS |
| SNAP-D12MC |
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| SNAP-D4M |
| SNAP-D4MC |
| SNAP-D4MC-P |
| SNAP-D6M |
| SNAP-D6MC |
| SNAP-D6MC-P |
| SNAP-D8M |
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| SNAP-ENET-D64 |
| SNAP-ENET-S64 |
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