EVS-EN 60793-1-47:2009

This part of IEC 60793 establishes uniform requirements for measuring the macrobending loss of single-mode fibres (category B) at 1 550 nm or 1 625 nm, category A1 multimode fibres at 850 nm or 1 300 nm, and category A3 and A4 multimode fibres at 650 nm, 850 nm or 1 300 nm, thereby assisting in the inspection of fibres and cables for commercial purposes.  The standard gives two methods for measuring macrobending sensitivity: •  Method A – Fibre winding, pertains to category B single-mode fibres and category A1 multimode fibres.  •  Method B – Quarter circle bends, pertains to category A3 and A4 multimode fibres.  For both of these methods, the optical power is measured using either the power monitoring or the cut-back technique.