Signature analysis usage for fault isolation

摘要: Test equipment and test methods employing signature analysis to achieve fault isolation of digital modules. Fault free signatures faulty a module are stored in lookup table that derived from physical measurement or simulation all components thereof. input signals then applied under test, outputs points thereof multiple shift register signal analyzer. The analyzer performs pass/fail using the signals. inputs source (either on-board external thereto) test. When failure occurs during testing comparator circuitry is used find corresponding match with signatures. A message sent as an output identifying failed node so can be repaired. present invention does not require expensive automatic therefore provides more cost-effective approach analysis.