Measuring relays and protection equipment - Part 181: Functional requirements for frequency protection (IEC 60255-181:2019); German version EN IEC 60255-181:2019
Edition 2020-02

Fibre optic active components and devices - Performance standards - Part 1: General and guidance (IEC 62149-1:2011); German version EN 62149-1:2012
Edition 2012-09

Quartz crystal controlled oscillators of assessed quality - Part 4: Sectional specification - Capability approval (IEC 60679-4:1997); German version EN 60679-4:1998
Edition 1998-11

Fibre optic active components and devices - Test and measurement procedures - Part 1: General and guidance (IEC 62150-1:2005); German version EN 62150-1:2005
Edition 2005-12

Printing technology; printing plates for offset printing; terminology and principles of measurement techniques
Edition 1991-09

Quartz crystal controlled oscillators - Part 2: Guide to the use of quartz crystal controlled oscillators (IEC 60679-2:1981)
Edition 1997-09

Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 1: General and guidance (IEC 61754-1:2013); German version EN 61754-1:2013
Edition 2014-05

Optical circuit boards - Part 3: Performance standards - General and guidance (IEC 62496-3:2011); German version EN 62496-3:2011
Edition 2011-09

Fibre optic interconnecting devices and passive components performance standard - Part 061-3: Single mode fibre optic pigtailed style isolators for category U - Uncontrolled environment (IEC 61753-061-3:2004); German version EN 61753-061-3:2004
Edition 2005-04

Fibre optic interconnecting devices and passive components performance standard - Part 091-3: Single-mode fibre optic pigtailed style circulators for category U - Uncontrolled environment (IEC 61753-091-3:2004); German version EN 61753-091-3:2004
Edition 2005-04