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如何修理万用表
更新时间: 2020-09-16 00:00:00  

修理万能表方法

1、感觉法:观察万能表外观,发现如断线、脱焊、搭线短路、熔丝管断、烧坏元件、机械性损伤、印刷电路上铜箔翘起及断裂等。可触摸出万能表电池、电阻、晶体管、集成块的温升情况。检查万能表元件是否松动、集成电路脚管是否插牢。可以听到和嗅到有无异声、异味;

2、测电压法:测量万能表各关键点的工作电压是否正常,可较快找出故障点。如测A/D转换器的工作电压、基准电压等;

3、短路法:检查万能表A/D转换器方法里一般都采用短路法,此方法在修理弱电和微电仪器时常用;

4、断路法:将可疑部分从万能表整机或单元电路中断开,若故障消失,表示故障在断开的电路中;

5、测元件法:当故障已缩小到某处或几个元件时,可对万能表进行在线或离线测量。

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