E4809-032-219 现货

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 E4809-032-219 现货
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E4809-032-219
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OKUMA SW-OSP PC-1613-L. FILE- BOARD
三.功能与参数测试 
1.<测试仪>对器件的检测,仅能反应出截止区,放大区和饱和区.但不 
能测出工作频率的高低和速度的快慢等具体数值等. 
2.同理对TTL数字芯片而言,也只能知道有高低电平的输出变化.而无 
法查出它的上升与下降沿的速度. 
四.晶体振荡器 
1.通常只能用示波器(晶振需加电)或频率计测试,万用表等无法测量, 
否则只能采用代换法了. 
2.晶振常见故障有:a.内部漏电,b.内部开路c.变质频偏d.外围相连电 
容漏电.这里漏电现象,用<测试仪>的VI曲线应能测出. 
3.整板测试时可采用两种判断方法:a.测试时晶振附近既周围的有关 
芯片不通过.b.除晶振外没找到其它故障点. 
4.晶振常见有2种:a.两脚.b.四脚,其中第2脚是加电源的,注意不可随 
意短路. 
五.故障现象的分布 
1.电路板故障部位的不完全统计:1)芯片损坏30%, 2)分立元件损坏30%, 
3)连线(PCB板敷铜线)断裂30%, 4)程序破坏或丢失10%(有上升趋势). 
2.由上可知,当待修电路板出现联线和程序有问题时,又没有好板子,既 
不熟悉它的连线,找不到原程序.此板修好的可能性就不大了.  


手机 18030129917

电话0592-6372625

QQ 3001408750

E4809-032-219 现货
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E4809-032-219 现货


 4. Marathon Technologies

  Marathon通过增加了容错、高可用性以及灾难恢复的功能一直处于很多虚拟化用户最爱列表中的首位,这些特性加入到架构中可以减少虚拟机本身所带来的危险性。公司的everRun提供了失效恢复簇、组件级别的容错功能,它可以同时保护存储和系统组件,并且一个系统级别的控制可以备份那些当前被真正关键应用使用的存储。针对那些应用,EverRun在内存中保留了一份实时的数据拷贝,因此它们的工作负载可以被转移到另外一台虚拟机上,而需要零宕机时间,并且没有任何交易或者数据的损失。直到今年的1月份,Marathon仅仅支持Citrix的虚拟机,而它也在最近也宣布了和微软之间的合作,以扩展它的功能到带有Hyper-V的Windows Server 2008上运行。


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