UNE-EN 61746-1:2011 Calibration of Optical Time-Domain Reflectometers (OTDR) -- Part 1: OTDR for single-mode fibres (Endorsed by AENOR in May of 2011.)
2014UNE-EN 61746-1:2011/AC:2014 Calibration of optical time-domain reflectometers (OTDR) - Part 1: OTDR for single-mode fibres (Endorsed by AENOR in November of 2014.)
2011UNE-EN 61746-1:2011 Calibration of Optical Time-Domain Reflectometers (OTDR) -- Part 1: OTDR for single-mode fibres (Endorsed by AENOR in May of 2011.)