商铺名称:厦门盈亦自动化科技有限公司
联系人:刘莉(小姐)
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联系地址:厦门市集美区杏林禹州中央海岸一期5号楼923室
邮编:361022
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280SPWRM22HM2电缆
:先外后内
使用工具:电路在线维修仪
如果情况允许,是找一块与被维修板一样的好板作为参照,然后使用一起的双棒VI曲线扫描功能对两块板进行好、坏对比测试,起始的对比点可以从端口开始,然后由表及里,尤其是对电容的对比测试,可以弥补万用表在线难以测出是否漏电的缺憾。
:先易后难
使用工具:电路在线维修仪、电烙铁、记号笔
为提高测试效果,在对电路板进行在线功能测试前,应对被修板做一些技术处理,以尽量削弱各种干扰对测试进程带来的负面影响。具体措施是:
1、测试前的准备
将晶振短路,对大的电解电容要焊下一条脚使其开路,因为电容的充放电同样也能带来干扰。
2、采用排除法对器件进行测试
对器件进行在线测试或比较过程中,凡是测试通过(或比较正常)的器件,请直接确认测试结果,以便记录;对测试未通过(或比较超差)的,可再测试一遍,若还是未通过,也可先确认测试结果,就这样一直测试下去,直到将板上的器件测试(或比较)完,然后再回过头来处理那些未通过测试(或比较超差)的器件。对未通过功能在线测试的器件,仪器还提供了一种不太却又比较实用的处理方法,由于仪器对电路板的供电可以通过测试夹施加到器件相应的电源与地脚,若对器件的电源脚实施刃割,则这个器件将脱离电路板供电系统,这时再对该器件进行在线功能测试,由于电路板上的其他器件将不会再起干扰作用,实际测试效果等同于“准离线”,测准率将获得
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280SPWRM22HM2电缆