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Title: Metroval A Calibration Software With Advanced Uncertainty And Prediction Capabilities Including Complex Numbers
Author: Alex Lepek
Source: 2009 Measurement Science Conference
Year Published: 2009
Abstract: This paper describes the present version of the MetroVal calibration program. The calibration procedure is edited in a simple table. This approach enables non-programmers to prepare calibration procedures. The procedure can call various modules (which can be stand-alone) to calculate uncertainty, do prediction or run the Sequencer and math Evaluator and finally issue the result report. To do automatic measurements and control instruments the Sequencer can call the VISA Dynamic Link Library. The uncertainty module can estimate measurement uncertainties per ISO GUM or by Monte-Carlo simulation directly from the measurement equation. The Prediction module can estimate parameter values and uncertainties of measurement standards due to drifts from their past calibrations. The combination of prediction with uncertainty enables the use in real time of the predicted values of the of measurement standards as components in the uncertainty budget. MetroVal modules can deal with complex numbers. The program complies with relevant international standards and recommendations such as ISO/IEC 17025, ISO GUM (and supplement 1 draft describing Monte-Carlo method), the use of BMC, ILAC G8 document for compliance with specification and ILAC G24/OIML D 10 for recalibration intervals

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