DIN EN IEC 61744:2023-12
光纤色散测试仪的校准（IEC 61744:2023）；德文版 EN IEC 61744:2023
Calibration of fibre optic chromatic dispersion test sets (IEC 61744:2023); German version EN IEC 61744:2023 / Note: DIN EN 61744 (2006-10) remains valid alongside this standard until 2026-05-09.