Optical fibres - Measurement methods and test procedures. Beat length1 Scope This part of IEC 60793 defines test methods for both the phase beat length, and the group beat length. These two parameters are defined differently, and will give different results depending on the type of polarization maintaining (PM) fibre. The phase beat length is the relevant parameter for the fibres ability to maintain a high extinction ratio. This is described in more details in Annexes A and B.

BS EN 2436-002 on high corrosion resistance primers applies to:

the requirements of BS EN 15153‑2 do not apply to the pushed vehicle(s)

It is applicable to solid vulcanized rubbers of hardness 20 to 80 IRHD for which the deformation is predominantly elastic

The aim of the BS 373 provides the best industrial practices to determine the characteristics of timber

load push/push-off device

What is BS EN 61204 - Low-voltage power supply devices about

16 Resistance to refrigerants

Part 1: Narrow strip and cut lengths

out-of-production spares)

Characterisation of the environment

energy storage system and power converters

Cleanliness personnel for spacecraft systems