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ESD and surge tests are generally performed with a too small sample size: often even with only one single product. This paper presents a methodology on relating confidence level versus compliance level as function of sample size and test outcome. It is recommended to use seven products for each test. When all seven pass the test, this gives 80 % confidence that 80 % of all products comply with the...
Currently, research activities are underway to create coexistence between active implantable medical devices and Magnetic Resonance Imaging (MRI). One of the questions is if ferrite materials can be used for miniature transformers for EMI suppression. Commonly it is known that the use of magnetic materials should be minimized in and near an MRI scanner because MRI employs large magnetic fields with...
The sensitivity of a 1.5T MRI system has been measured for incident electromagnetic fields. This determines the specification for electronic equipment to be used in an MRI room as well as the specification of MRI room shielding.
Taking the emission requirements from IEC 60601–1–2 as starting point, a detailed analysis of the shielding requirements of an examination room for a 3T Magnetic Resonance Imaging scanner has been made. A 3D Finite Element model of scanner and shielding room has been built and the influence of slits on the shielding performance has been investigated. Comparison between simulations of shielding effectiveness...
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