How are digital and analog timers calibrated?
The timer would be checked against the electric clock nearby or somebody's timepiece. Don't laugh. The reasons given is that the time for baking and the varying temperatures are estimates arrived at through years of performing this process.
Can an Auditor question the methods proposed with such varying baking times and temperatures? The time would be +/- 2 minutes and the temperature would be +/- 5 deg.
Take it easy on me.
M Greenaway said:
It could be argued that if you can verify the output of the process with calibrated equipment then you need not verify the parameters of the process itself with calibrated equipment.
With such a large band on your baking times I would imagine that its unnecessary to calibrate a timer, any wristwatch should do the trick (verified with the bloke stood next to you if you wish).