Abstract
The main content of logic circuit fault detection includes describing circuit to be diagnosed, determining fault and circuit initial information, generating circuit location test set. In this study, LASAR is used to carry out the logic circuit simulation so as to create such documents as fault dictionary, node truth value table, etc. for the preparation of fault detection. Due to the limitation of circuit observability and testing vectors, the diagnosis program can not accurately locate the fault just once in the process of diagnosis because the circuit is complex and users are not quite familiarity with the circuit. Therefore, the new circuit-fault-detection technology incorporates techniques of PCB picture-location so that the users can locate the fault quickly and accurately.
Highlights
FAULT DICTIONARY TECHNIQUEThe main content of digital circuit fault detection includes describing circuit to be diagnosed, determining fault and circuit initial information, generating circuit location test set, simulating fault, judging whether location test set meets predetermined fault diagnosis requirement, setting up fault diagnosis test program
In the process of fault detection, the fault diagnosis and location can be completed as long as test sequence to the circuit is applied in order, circuit response is measured successively and fault dictionary is retrieved
Gu and Liu (2005) study the fault diagnosis based on automatic testing system
Summary
FAULT DICTIONARY TECHNIQUEThe main content of digital circuit fault detection includes describing circuit to be diagnosed, determining fault and circuit initial information, generating circuit location test set, simulating fault, judging whether location test set meets predetermined fault diagnosis requirement, setting up fault diagnosis test program. This study designs the logic circuit fault detection system in missile launch control system by LASAR circuit simulation and VXI bus technique. The detection program drives VXI bus to apply exciting signal to the circuit under diagnosis and to read its response and analyzes the fault location according to circuit response and simulation created file.
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