The fraction of faults that a safety mechanism can detect or control, abbreviated DC. Adding a safety mechanism with 99% diagnostic coverage to a 200 FIT circuit leaves 2 FIT of undetected faults.
Japanese name: 診断カバレッジ
Diagnostic coverage appears in 4 practice questions across 1 topic, including Automotive Semiconductors and Functional Safety.
Answer: C. 2 FIT
Diagnostic coverage (DC) is the proportion of faults that a safety mechanism can detect or control. The remaining failure rate is 200 × (1 − 0.99) = 200 × 0.01 = 2 FIT. 198 FIT is the failure rate of the faults the safety mechanism can detect, and 0.02 FIT is the result of misplacing the decimal point in the multiplication. Fault coverage in manufacturing test represents the proportion of defective parts found before shipment, whereas diagnostic coverage represents the proportion of faults occurring in use that are detected on the spot.
Diagnostic coverage (DC) is the proportion of faults that a safety mechanism can detect or control.
A safety mechanism with 99% diagnostic coverage is added to…Failure rate, diagnostic coverage and FTTI are quantities used after the ASIL is determined, to evaluate whether a design meets its requirements.
In ISO 26262, which correctly lists the three factors evalu…To raise SPFM, add safety mechanisms with high diagnostic coverage to reduce faults that remain undetected.
The total failure rate of safety-related hardware is 1000 F…If one result changes due to a bit flip from cosmic rays or a circuit fault, it is detected as a mismatch, giving high diagnostic coverage for CPU faults.
Which correctly describes how a lockstep CPU, used as a saf…As an Amazon Associate I earn from qualifying purchases.
Safety mechanism ASIL (Automotive Safety Integrity Level) Fault coverage ISO 26262 HARA (hazard analysis and risk assessment) FTTI (fault tolerant time interval) SPFM (single-point fault metric) Lockstep CPU Comparator AEC-Q100