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Analysis of Measurement Uncertainty - Q7 VDA 5 GUM
As a result of worldwide cooperation of metrological organizations, GUM (Guide to the Expression of Uncertainty in Measurement) was published in 1993. The GUM is a DIN V ENV 13005 standard in the international metrology and calibration systems. The objective of the GUM, a systematic approach to determine measurement uncertainty (the range where the true value of the measured quantity lies with a certain probability). This approach differs fundamentally from the methods of MSA (Measuring Systems Analysis), which also determines similar values, but not systematically, only empirically.
The GUM requires a step by step approach:
- The measurement process is analyzed. The influences on the measurement results are identified, named and represented in a model equation
- The sizes of the individual influences are determined (Type A or Type B)
- The expanded uncertainty is calculated
Depending on the measuring process, the cost of analysis and calculation can be considerable. When measuring processes that are applied the same way more than once (in the industrial environment this will be the normal case), it's completely sufficient to run this analytical and mathematical effort only once. All Q7 GUM modules work according to this pattern. The test process model will be prepared and elaborated on the basis of the GUM. The mathematical relationships are already preestablished. The user only has to determine and enter the data requested by the software about the individual conditions. He then receives the measurement uncertainty analysis just with a simple click of a button.
Q7 VDA 5 GUM - Software for the Analysis of Measurement Uncertainty
Why Measurement Uncertainty Analysis?
The evaluation of measurements has received clear rules with the validity of the DIN EN ISO 14253-1: "decision-making rules of the determination of compliance or non-compliance with specifications". It is called to take into account if the measurement uncertainty of the products comply with the required specifications or not. Furthermore, the DIN EN ISO 14253-1 requires the application of DIN V ENV 13005, "Guide to the Expression of Uncertainty in Measurement" to determine this uncertainty. This guide is the normative implementation of the GUM (Guide to the Expression of Uncertainty in Measurement).
The GUM was the result of an international project of metrological organizations in order to achieve a harmonized approach to the issue of measurement uncertainty. Since the end of 2000, measurement uncertainty analysis according to the GUM are mandatory in DKD. Because the German automotive industry demands the DIN 14253-1 they have taken up the function of the GUM with the VDA 5 and practicaly prepared those in a simplified form.
Procedure of VDA 5
The measurement uncertainty is always determined according to the same pattern. In the first step, the model of the testing process will be created, that is, the influences on the measurement uncertainty is named (environmental conditions, characteristics of measuring objects, etc.). In the second step, the size of the influences (component) is determined. This quantity can be determined from measurements (type A) or from other sources of information taken (type B). The subsequent evaluation determines the expanded measurement uncertainty and the parameters for capacity or rather the smallest possible measurable tolerances.
Q7 VDA 5 GUM
Q7 VDA 5 GUM frees the user from two of these three steps. The software offers numerous, completed test process models from the area of the measured variable length. This is especially important and economically for routine measurement tasks. It makes no sense that any company has to create various identical measurement tasks with the amount of resource consumption, like "test of the diameter of a bore with an internal precision measuring instrument", over and over again. One time is enough.
The user is guided by querying a number of conditions to select the appropriated test process model for its measurement task. The software asks you then for all information needed for the analysis, which are of course different for the individual review process.
The user can modify the supplied test processes and also create new test process models whenever necessary. Q7 VDA 5 GUM calculates the standard uncertainty of all components and displays them in order of their size. The expanded uncertainty of measurement is also calculated and documented.
The parameters according to VDA 5 are determined and displayed. The output of the analysis is also possible in the form of a PDF file.
|Further Requirements||CD-ROM Drive
Adobe Acrobat Reader 7 or higher version
|Operating System||Windows Vista, 7, 8|
|Minimum CPU||1 GHz|
|Min. RAM||512 MB|
|Disc Space||ca. 20 MB|