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Math Terms
Terms that are used for various mathematical functions within functional safety. These terms are often part of PFDavg and STR, the two most pressing calculated values.
- Beta Factor
- Diagnostic Coverage (DC)
- Diagnostic Coverage Dangerous (DCdang)
- Diagnostic Coverage Safe (DCsafe)
- Diagnostic Test Interval (DTI)
- Dispersion Analysis
- Failure Rate (λ)
- Lifetime
- Mean Detection Time (MDT)
- Mean Repair Time (MRT)
- Mean Time Between Failure (MTBF)
- Mean Time to Fail Spurious (MTTFsp)
- Mean Time to Failure (MTTF)
- Mean Time to Restore (MTTR)
- Probability of Failure on Demand (PFD)
- Probability of Failure per Hour (PFH)
- Probable Loss of Life (PLL)
- Proof Test Coverage (Cpt)
- Proof Test Interval (TI)
- Risk Reduction Factor (RRF)
- Safe Failure Fraction (SFF)
- Spurious Trip Rate (STR)