The Method Research And Application On Electronic Equipment Fault Diagnosis

As is well known,in electronic devices,especially modern microelectronic circuits with the core of integrated circuits,the fault of any device may lead to partial function lapse or the whole equipment malfunction,due to the equipment scale increasingly large,the performance and construction complex and perfect much more.However,the development of the electronic fault diagnostic technique is relatively slow by contrast.So with the development of the electronics,the requirement of the reliability,the serviceability and the automatic fault diagnosis of the electronic circuit is increasingly urgent.The electronic fault diagnosis falls into two phases:the first phase proceeds the whole appliance test to the electronics,isolates the fault to fault equipment or the fault circuit board;the second phase proceed test to fault equipment or fault circuit,locates fault to fault device.To achieve the goal,the text designs the electronic fault diagnostic system with some type army vehicle-carrying electronics and some control circuit board as the subject.The text includes two section content:introduce the electronic fault diagnosis method,emphasisly reseach fault dictionary method and fault tree analysis;desperately aim at the electronic device whole machine test and circuit board fault device test,design the electronic fault diagnosis system.In the design of the fault diagnosis system of some type army vehicle-carrying electronic device,the unknock-out detection scheme.The fault diagnosis instrument is exploited with the utilization of the electronic connection plug.Using the fault dictionary method,database,virtual instrument technique,with collection,contrast,analyses to the plug signal,the detection is fast carried out to electronic whole machine fault and the fault cause can be found out,the fault clearnance method is given.In the fault diagnosis system design of some control circuit board,the circuit board hierarchical structure analyses based on fault tree thought is adopted,the fault device location of the fault circuit board is realized according to the course of from up to down.