You don’t’ really know what you know until you have to explain it (or teach it) to someone else.
When I’m asked about some of the technical aspects of functional safety, I have to stop and ask myself “What Do I Know About This?” I’m not the kind…
exida explains Blog
Entries tagged with: Mission Time
- by John Yozallinas, CFSE
- Thursday, August 22, 2019
- Functional Safety
Do You Really Know What You Know (When it Comes to Functional Safety)?
- by Dr. Steve Gandy, CFSP
- Thursday, September 26, 2024
- Functional Safety
How Does Mission Time Work with Proof Testing to Impact SIL Verification?
I have been asked this question many times by various clients over the years. This comes down to whether a perfect proof test is assumed or not. Let us remember that Mission Time is defined as the amount of time we expect a set of SIF equipment to run until a…
- by Dr. Steve Gandy, CFSP
- Tuesday, November 04, 2025
- Functional Safety
How Does Mission Time, Proof Test Interval and Proof Test Coverage Impact PFDavg?
Oftentimes when this comes up during class it’s clear that there’s a misunderstanding as to how these three variables can impact the PFDavg calculations. Mission Time is defined as the period of time over which a set of Safety Instrumented Function (SIF) equipment is expected to operate without major…
- by Dr. Steve Gandy, CFSP
- Thursday, August 24, 2017
- Functional Safety
Why Proof Test Coverage Is So Important For A SIF to Achieve Its Target SIL?
This is a question I often get asked when I’m teaching our FSE100 course on Functional Safety, when we discuss the purpose of Proof Testing and coverage. It’s amazing how many end users assume perfect proof testing (i.e. 100% coverage), that is capable of finding, all the…