R089 1990 Electroencephalographs Metrological characteristics Methods and equipment for verificationhttps://www.oiml.org/en/publications/other-language-translations/persian/r089-1990-electroencephalographs-metrological.pdf/viewhttps://www.oiml.org/logo.png
R089 1990 Electroencephalographs Metrological characteristics Methods and equipment for verification