2. Define how parameters of interest are calculated
It is understood that the homogeneity and stability parameters are determined when steady state is reached.
Note that in the NF EN 60068-3 series of European standards, the terms homogeneity and stability (and their equivalents gradient and fluctuation) are used interchangeably to designate the parameter and the uncertainty component.
Let's take a look at the calculation methods recommended in the normative documents. For each parameter and uncertainty component, we propose an alternative method based on the fact that a statistical estimate is more relevant when based on means and standard deviations than on max values and max deviations.
2.1 Homogeneity parameter
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Define how parameters of interest are calculated
Determine tolerances and acceptance limits
Bibliography
FD X15-140: 2013 Air humidity measurement – Climatic and thermostatic chambers – Characterization and verification
NF EN 60068-3-5 : 2002 Environmental testing part 3-5 : Accompanying documentation and guide – Confirmation of the performance of temperature test chambers
NF EN 60068-3-6 : 2002 Environmental testing part 3-6 : Accompanying...
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