工控系统及装备
R88M-K90010H-Z
发布时间:2016-09-23 15:46:08 产品编号:GY-5-101310342  分享
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-K90010H-Z,供应,电子、电工,工控系统及装备

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 R88M-K90010H-Z R88M-K90010H-Z R88M-K90010H-Z 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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这将与中国鼓励发展海洋工程装备、培育船舶工业新经济增长的初衷相违背。

  因此,中国船舶工业行业协会会长张广钦提醒:“海工装备不同于船舶批量生产。对于进入者而言,门槛相对高很多。”

  对此,大船重工海洋工程有限公司总经理殷学林也表示,“我比较担心这些进入海工装备领域的企业,他们有没有认识到这块市场。”殷学林分析认为,2003年至今,国内三大石油公司所有的钻井平台才12座。而目前的经济很难恢复到过去的程度,从中国这个局部来看,应该说需求量不会太大。“就算出现船市火爆的情形,我一家都能干完这些订单。在钻井平台这一块,市场容量是不大的。”


 
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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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联系方式
公司: 厦门盈亦自动化科技有限公司
状态:离线 发送信件
姓名:傅工(先生)
职位:销售工程师
电话:0592-6372625
手机:18030129917
传真:0592-6372627
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地址:厦门市集美区宁海五里杏林湾一号一期32号804
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去 厦门盈亦自动化科技有限公司怎么走?上图中的红点是 厦门盈亦自动化科技有限公司在厦门市的具体位置标注,操作左上角地图工具可以放大缩小哦。
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