Radio-frequency connectors - Part 21: Sectional specification for RF connectors with inner diameter of outer conductor 9,5 mm (0,374 in) with screw coupling - Characteristic impedance 50 ohms (Type SC)
Edition 2022-04

Radio-frequency connectors - Part 50: Sectional specification for RF coaxial connectors with inner diameter of outer conductors 4,11 mm with quick lock system - Characteristic impedance 50 Ohm (type QMA)
Edition 2015-03

Radio-frequency connectors - Part 51: Sectional specification for RF coaxial connectors with inner diameter of outer conductors 13,5 mm with bayonet lock - Characteristic impedance 50 O (type QLI)
Edition 2015-05

Radio-frequency connectors. Part 16: Sectional specification - RF coaxial connectors with inner diameter of outer conductor 7 mm (0,276 in) with screw coupling - Characteristics impedance 50 ohms (75 ohms) (type N)
Edition 2007-04

Radio-frequency connectors. Part 8: Sectional specification - RF coaxial connectors with inner diameter of outer conductor 6,5 mm (0,256 in) with bayonet lock - Characteristics impedance 50 ohms (type BNC)
Edition 2007-04

Radio-frequency connectors - Part 14: R.F. coaxial connectors with inner diameter of outer conductor 12 mm with screw coupling - Characteristic impedance 75 ohms (Type 3.5/12)
Edition 2010-12

RF coaxial connectors 1,6-5,6 serie characteristic impedance 75 ohms. Type KTB
Edition 1986-09-01

Soil : investigation and testing. Auscultation of buried work. Part 4: impedance test
Edition 1994-03-01

Acoustics - Determination of acoustic properties in impedance tubes - Part 2: two-microphone technique for normal sound absorption coefficient and normal surface impedance
Edition 2023-10-11

Communication cables - Specifications for test methods - Part 1-11: Electrical test methods - Characteristic impedance, input impedance, return loss (german version)
Edition 2018-09-01