DIN EN IEC 63093-7:2018-12
Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 7: EER-cores (IEC 63093-7:2018); German version EN IEC 63093-7:2018 / Note: DIN EN 62317-7 (2006-07) remains valid alongside this standard until 2021-04-26.