Modified Diagnosis Algorithms Based on Multisignal Model and Application in Circuit Boards

Multisignal model is introduced to fault diagnosis for circuit boards including digital devices and analog devices. Dr. Deb real-time diagnosis algorithm based on multisignal model may produce conflict diagnostic results because of false alarm for that the sampled test signal may be disturbed by noise. We propose a modified algorithm by introduce failure confidence factor and apply it to fault diagnosis for an USB-GPIB interface circuit. The results show this method is easy to operate and diagnosis precise is high and is suitable for circuit boards fault diagnosis.