IEC TR 62617 pdf download

IEC TR 62617 pdf download Home laundry appliances – Uncertainty reporting of measurements
1 Scope
This Technical Report (TR) applies to uncertainty reporting of home laundry electrical appliances.
It allows to estimate the uncertainty of a measured result and to predict the range of values that may be measured when the same appliance is measured in another laboratory following
the same measurement method.
NOTE The provisions in this TR can also be used to evaluate other kinds of products.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO/IEC Guide 98-3:2008, Uncertainty of measurement – Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)
IEC 61 923:1 997, Household electrical appliances – Method of measuring performance – Assessment of repeatability and reproducibility
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
repeatability conditions
conditions where independent test results are obtained with the same method on identical test items in the same laboratory by the same operator using the same equipment within short
intervals of time [IEC 61 923:1 997, 3.6]
3.2
repeatability standard deviation
standard deviation of test results obtained under repeatability conditions
[IEC 61 923:1 997, 3.7]
3.3
reproducibility conditions
conditions were test results are obtained with the same method on identical test items in different laboratories with different operators using different equipment
[IEC 61 923:1 997, 3.9]
3.4
reproducibility standard deviation
standard deviation of test results obtained under reproducibility conditions
[IEC 61 923:1 997, 3.1 0]
3.5
statistical uncertainty
repeatability standard deviation obtained in one laboratory under repeatability conditions
3.6
expanded uncertainty
confidence interval, which allows to calculate the minimum and maximum value where the average measured result may be found when the measurement is re-done at any other laboratory following reproducibility conditions
4 The approach to uncertainty measurement
4.1 The importance of the uncertainty
When a measurement has been performed giving a figure as a result for some quantity (i.e.the measurand), how sure is this figure? In other words:
– if the measurement is repeated, will the same figure be achieved as the result?
– if another group or another laboratory performs the measurement, how close will the results expected to be?
By means of an uncertainty amount an uncertainty interval y ± U may be calculated, where y is the measurement result and U the expanded uncertainty that is determined to give the interval a high probability (often 95 %) to cover the true value, Y, of the measurand. U is said to be the uncertainty associated with the result y.