价格:
999.00/个
品牌:欧姆龙
起订:1个
供应:2个
发货:1天内
信息标签:R88M-W7K515T-BS2,供应,电子、电工,工控系统及装备
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R88M-W7K515T-BS2 R88M-W7K515T-BS2 R88M-W7K515T-BS2模块 PLC
工业电路板维修技巧
不能过分依赖在线测试仪
1.功能测试不能代替参数测试
2. 功能测试仅能测试到器件的截止区,放大区和饱和区,但无法了解此时的工作频率的高低和速度的快慢。
3. 对数字芯片而言,仅知道有高低电平的输出变化,但无法查出它的上升和下降沿的变化速度。
4. 对于模拟芯片,它处理的是模拟的变化量。其受电路的元器件的分布,解决信号方案的不同的影响,是错综复杂的。就目前的在线测试技术,要解决模拟芯片在线测试是不可能的。所以,这项功能测试的结果,仅能供参考。
5. 大多数的在线测试议,在对于电路板上的各类芯片进行功能测试后,均会给出“测试通过”或“测试不通过”。那么它为什么不给出被测器件是否有问题呢?这就是这类测试仪的缺撼。因为在线测试时,所受影响(干扰)的因素太多。要求在测试前采取不少的措施(如断开晶振,去掉CPU和带程序的芯片,加隔离中断信号等等),这样做是否均有效,值得研究。至少,目前的测试结果有时不尽人意。
6. 了解在线测试仪的读者,均知道有这么一句行话。“在线测试时不通过的芯片不一定是损坏的;测试通过的芯片一定是没有损坏的。”它的解释为,如器件受在线影响或抗干扰时,结果可能不通过,对此不难理解。那么,是否损坏的芯片在进行测试时,均会得出“不通过”呢?回答确实不能肯定。笔者与同行均遇到过,明明芯片已损坏了(确切地说换上这个芯片板子就不工作了),但测试结果是通过的。**解释为这是测试仪自身工作原理(后驱动技术)所致。故此我们不能过分依赖在线测试仪(尽管各厂家宣传的很玄)的作用,否则将使维修电路板的工作误入歧途。
维修技巧之二
在无任何原理图状况下要对一块比较陌生的电路板进行维修,以往的所谓“经验”就难有作为,尽管硬件功底深厚的人对维修充满信心,但如果方法不当,工作起来照样事倍功半。那么,怎样做才能提高维修效呢?根据我公司进口设备维修中心统计出来的资料,应遵循以下几个步骤、按顺序有条不紊的进行。
方法一:先看后量
使用工具:万用表、放大镜
当手拿一块待修的电路板,良好的习惯首先是应对其进行目测,必要时还要借助放大镜,看什么呢?
主要看:
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厦门盈亦自动化科技有限公司
联系人:付茂强
联系电话:0592-6372625
手机号码:18030129917
QQ号码:3459801480
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R88M-W7K515T-BS2 R88M-W7K515T-BS2 R88M-W7K515T-BS2模块 PLC
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R88M-W7K515T-BS2 R88M-W7K515T-BS2 R88M-W7K515T-BS2模块 PLC
力推 前景未明
根据国网的规划,“十二五”期间将投资超过5000亿元,建成“三纵三横”特高压交流骨干网架和10项特高压直流输电工程,通过特高压交流网架将华北、华东和华中区域电网连接起来,形成“三华同步电网”,其中交流特高压的投资额约占2/3,达3000亿元。
在2012年国网工作会议上,国网总经理刘振亚表示,2012年国网将“确保”锡盟—南京、淮南—南京—上海、蒙西—长沙、荆门—武汉—南昌4项特高压交流工程和3项特高压直流工程获得国家核准开工。去年的国网工作会议做出了类似的表述,计划在2011年内争取获得五项特高压交流工程的核准,其中包括皖电东送淮南—上海、锡盟—南京、南京—上海、蒙西—长沙、靖边—连云港等五项特高压交流工程,但只有皖电东送淮南—上海工程在2011年9月获得核准。
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厦门盈亦自动化科技有限公司
联系人:付茂强
联系电话:0592-6372625
手机号码:18030129917
QQ号码:3459801480
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