Several years ago we recognized that proof test coverage was an important variable that must be considered when doing PFDavg calculations. We ran some models and discovered that the difference between “perfect” proof test coverage (100%) and a very good 90% could mean a whole SIL…
exida explains Blog
Entries tagged with: Proof Test Coverage
- by Dr. William Goble, CFSE
- Thursday, February 09, 2017
- Functional Safety
Getting Good Proof Test Coverage Numbers
- by Dr. William Goble, CFSE
- Wednesday, February 27, 2013
- Software
The Real PFDavg Variables
I was recently asked how the PFDavg value in an exida FMEDA report was calculated. Those PFDavg values are calculated using the exSILentiaTM program. The person who posed the question was using the equations from Part 6 of IEC 61508 and got a different value. Why?