- System - Equipment, Standard Used
- Human - Skill, Experience
- Procedure - Method used
- Environment - Temperature, Humidity
- System Uncertainties
There are uncertainties due to the accumulation of errors within the calibration chain.
- Random Uncertainties
These are the uncertainties associated with human errors, equipment method used, environment, etc.
Usually the confidence probability of not less than 95% for most of the calibration lab but some of the more sophiscated laboratories may quote confidence probability of not less 99%.
