Comments on Sources of Uncertainties Experimental uncertainty due to random measurement effects are distinct from systematic errors introduced by defective equipment or proceedures or caused by unknown influences on the equipment. Also we will treat the uncertainty differently if it arrises from an indepaendant source than when it is related to a source already considered. The error will be different with each repetition of the measurement. Repeating the measurement will reproduce the same error. Independant sources of error.
Uncertainty is compounded.