IEC 60793-1-43-2015 pdf download

IEC 60793-1-43-2015 pdf download.Optical fibres – Part 1–43: Measurement methods and test procedures– Numerical aperture measurement. 5 Apparatus 5.1 Input system 5.1 .1 Light source Use an incoherent light source capable of producing an area of substantially constant radiance (variations of less than 1 0 % in intensity) on the...