1794-IB8 端子
.功能與參數(shù)測試
1.<測試儀>對器件的檢測,僅能反應(yīng)出截止區(qū),放大區(qū)和飽和區(qū).但不
能測出工作頻率的高低和速度的快慢等具體數(shù)值等.
2.同理對TTL數(shù)字芯片而言,也只能知道有高低電平的輸出變化.而無
法查出它的上升與下降沿的速度.
四.晶體振蕩器
1.通常只能用示波器(晶振需加電)或頻率計測試,萬用表等無法測量,
否則只能采用代換法了.
2.晶振常見故障有:a.內(nèi)部漏電,b.內(nèi)部開路c.變質(zhì)頻偏d.外圍相連電
容漏電.這里漏電現(xiàn)象,用<測試儀>的VI曲線應(yīng)能測出.
3.整板測試時可采用兩種判斷方法:a.測試時晶振附近既周圍的有關(guān)
芯片不通過.b.除晶振外沒找到其它故障點.
4.晶振常見有2種:a.兩腳.b.四腳,其中第2腳是加電源的,注意不可隨
意短路.
五.故障現(xiàn)象的分布
1.電路板故障部位的不完全統(tǒng)計:1)芯片損壞30%, 2)分立元件損壞30%,
3)連線(PCB板敷銅線)斷裂30%, 4)程序破壞或丟失10%(有上升趨勢).
2.由上可知,當(dāng)待修電路板出現(xiàn)聯(lián)線和程序有問題時,又沒有好板子,既
不熟悉它的連線,找不到原程序.此板修好的可能性就不大了.
1794-IB8 端子
| 1794-ACNR15XT |
| 1794-ADN |
| 1794-ADNK |
| 1794-AENT |
| 1794-AENTR |
| 1794-AENTRXT |
| 1794-CE3 |
| 1794-CJC2 |
| 1794-IA16 |
| 1794-IA8 |
| 1794-IA8I |
| 1794-IB10XOB6 |
| 1794-IB10XOB6XT |
| 1794-IB16 |
| 1794-IB16D |
| 1794-IB16XOB16P |
| 1794-IB16XT |
| 1794-IB32 |
| 1794-IB8 |
| 1794-IC16 |
| 1794-ID2 |
| 1794-IE12 |
| 1794-IE4XOE2 |
| 1794-IE4XOE2XT |
| 1794-IE8 |
| 1794-IE8XOE4 |
| 1794-IE8XT |
| 1794-IF2XOF2I |
| 1794-IF2XOF2IXT |
| 1794-IF4I |
| 1794-IF4IXT |
| 1794-IF8IH |
| 1794-IF8IHNFXT |
| 1794-IG16 |
| 1794-IH16 |
| 1794-IJ2 |
| 1794-IJ2XT |
| 1794-IM16 |
| 1794-IM8 |
| 1794-IP4 |
| 1794-IR8 |
| 1794-IRT8 |
| 1794-IRT8XT |
| 1794-IT8 |
| 1794-IV16 |
| 1794-IV32 |
| 1794-LBL |
| 1794-N2 |
| 1794-NM1 |
| 1794-OA16 |
| 1794-OA8 |
| 1794-OA8I |
| 1794-OB16 |
| 1794-OB16D |
| 1794-OB16P |
| 1794-OB16PXT |
| 1794-OB32P |
| 1794-OB8 |
| 1794-OB8EP |
| 1794-OB8EPXT |
| 1794-OC16 |
| 1794-OE12 |
| 1794-OE4 |
| 1794-OE4XT |
| 1794-OF4I |
| 1794-OF4IXT |
| 1794-OF8IH |
| 1794-OG16 |
| 1794-OM16 |
| 1794-OM8 |
| 1794-OV16 |
| 1794-OV16P |
| 1794-OV32 |
| 1794-OW8 |
| 1794-OW8XT |
| 1794-PS13 |
| 1794-PS3 |
| 1794-TB2 |
| 1794-TB3 |
| 1794-TB32 |
| 1794-TB32S |
| 1794-TB37DS |
| 1794-TB3G |
| 1794-TB3GK |
| 1794-TB3GS |
| 1794-TB3GSK |
| 1794-TB3K |
| 1794-TB3S |
| 1794-TB3SK |
| 1794-TB3T |
| 1794-TB3TK |
| 1794-TB3TS |
| 1794-TB3TSK |
| 1794-TB62DS |
| 1794-TBN |
| 1794-TBNF |
| 1794-TBNK |
| 1794-VHSC |
| 1796-CNET32 |
| 1799-12SPCON |
| 1799-AUXCON |
| FOXBORO FBM237 冗余8通道0-20MA輸出接口組件 可選冗余8AO |
| FOXBORO FBM237? P0914XS |
| FOXBORO FBM24/25 觸點/125V直流電壓輸入 16DI |
| FOXBORO FBM240 P0917GZ |
| FOXBORO FBM240 P0917GZ FBM240 |
| FOXBORO FBM240電纜P0916FH |
| FOXBORO FBM241 8通道電壓監(jiān)視輸入，8通道離散量輸出（外部電源） 8DI/8DO |
| FOXBORO FBM241 P0914TG |
| FOXBORO FBM241 P0914TG |
| FOXBORO FBM241b 8通道電壓監(jiān)視輸入，8通道離散量輸出（內(nèi)部電源） 8DI/8DO |
| FOXBORO FBM241b P0914WK |
| FOXBORO FBM241c 8通道觸點輸入，8通道離散量輸出（外部電源） 8DI/8DO |
| FOXBORO FBM241d 8通道觸點輸入，8通道離散量輸出（內(nèi)部電源） 8DI/8DO |
| FOXBORO FBM242 16通道觸點輸出（外部電源）接口組件（可選冗余） 可選冗余16DO |
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| FOXBORO FBM242 P0916TA |
| FOXBORO FBM242? P0916TA |
| FOXBORO FBM243 8通道雙向FOXCOM雙波特率智能設(shè)備接口組件 8IT |
| FOXBORO FBM243 P0914TK |
| FOXBORO FBM246 冗余8通道雙向FOXCOM雙波特率智能設(shè)備接口組件 冗余8IT |
| FOXBORO FBM26/27 觸點/125V直流電壓輸入/輸出 8DI/8DO |
| FOXBORO FBM39 智能變送器輸入/0-20MA輸出 4AI/4AO |
| FOXBORO FBM41/42 觸點輸入/觸點輸出（2.25A） 8DI/8DO |
| FOXBORO FBM46 冗余智能變送器輸入/0-20MA輸出 4AI/4AO |
| FOXBORO FBM底板 P0926JM |
| FOXBORO FCM100E P0972ZA |
| FOXBORO FCM100Et P0926GS |
| FOXBORO FCM100E電纜 P0972TR |
| FOXBORO FCM10E |
| FOXBORO FCP270（F）與FBM接口 |
| FOXBORO FCP270（F）與FBM接口線 |
| FOXBORO FCP底板 P0926HW |
| FOXBORO FCS現(xiàn)場總線卡 |
| FOXBORO FOBORO P0400VT |
| FOXBORO FOXBORO CFT10 I/A |
| FOXBORO FOXBORO DO117KP |
| FOXBORO FOXBORO FPS400-24 |
| FOXBORO FOXBORO 83W-D01S1SSTNA |
| FOXBORO FOXBORO P0400DL |
| FOXBORO FOXBORO P0400DL |
| FOXBORO FOXBORO P0400QA |
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| FOXBORO FOXBORO P0700WB |
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| FOXBORO FOXBORO P0800DA |
| FOXBORO FOXBORO P0901VK |
| FOXBORO FOXBORO P0902DZ |
| FOXBORO FOXBORO P0903ZE |
| FOXBORO FOXBORO P0904AJ |
| FOXBORO FOXBORO P0911AC |
| FOXBORO FOXBORO P0911PU |
| FOXBORO FOXBORO P0911VW MIW GCIO |
| FOXBORO FOXBORO P0911ZZ |
| FOXBORO FOXBORO P0912HM |
| FOXBORO FOXBORO P0913ED |
| FOXBORO FOXBORO P0914XA |
| FOXBORO FOXBORO P0914ZM |
| FOXBORO FOXBORO P0961CA |
| FOXBORO FOXBORO PM400VP |
