Other participants: TÜBITAK, CMI, GUM, INTA, SIQ, SP, NIS, NQIS
The aim of this work package is to build capabilities towards a unified and modern approach for traceability and measurement uncertainty evaluation of coaxial S-parameter measurements. The currently still widely adopted black box methodology for measurement uncertainty evaluation through verification measurements (Ripple Method) is based on assumptions that are known to lead to inconsistencies and are certainly not fit for purpose at higher frequencies. The method generally produces both overestimated and underestimated measurement uncertainties. Advances in modelling of calibration standards and new software capabilities have prepared the path to a more consistent approach that is widely applicable and as well in better agreement with internationally accepted guidelines for the evaluation of measurement uncertainty, as described in the ISO-GUM. The new method is based on calculable calibration standards, involving electromagnetic modelling, a full measurement model and rigorous measurement uncertainty propagation supported by software.