ASD-STAN PREN 2591-1994 Aerospace Series Elements of Electrical and Optical Connection Test Methods - General《航空航天系列 电气和光学连接部件 试验方法 一般要求》.pdf
《ASD-STAN PREN 2591-1994 Aerospace Series Elements of Electrical and Optical Connection Test Methods - General《航空航天系列 电气和光学连接部件 试验方法 一般要求》.pdf》由会员分享,可在线阅读,更多相关《ASD-STAN PREN 2591-1994 Aerospace Series Elements of Electrical and Optical Connection Test Methods - General《航空航天系列 电气和光学连接部件 试验方法 一般要求》.pdf(18页珍藏版)》请在麦多课文档分享上搜索。
1、Draft for Public Comment DC 94/709218 Document I Latest date for receipt of comments 31 October 1994 ACE/ 6/ 3 Our ref Date qrMAugust 1994 Sub-committee ACE/6/3 - Aerospace - Connectors DRAFT EUROPEAN STANDARD - AEROSPACE SERIES ELEMENTS OF ELECTRICAL AND OPTICAL CONNECTION - TEST METHODS - GENERAL
2、(prEN 2591 ) (Ist Revision to EN 2591) This draft is now available for public comment and your views and technical comments on it would be appreciated. If you have no specific comments to make but find it generally acceptable it would be helpful if you would notify us accordingly. Suggestions entail
3、ing revision of the text should indicate the preferred wording. Please quote the relevant clause number against any comment. The Co-ordination of the requirements of this draft with those of any related standards is of particular importance and you are invited to point out any areas where this may b
4、e necessary All comments should be sent to the Committee Secretary Mr F P Slot at the London-WmZ address below The comments received will be passed to the committee concerned for its consideration; no acknowledgement will normally be sent. Requests for further copies of this draft should be sent to:
5、 Sales Administration (Drafts), BSI, Mord Wood, Milton Keynes MK14 6LE. F(ur 0908 320856, Telex 825777 BSIMK G. THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD Head office 2 Park Street, London W1A 2BS Telephone 071-629 9000 Telex 266933 BSILON G Fax 071-629 0506 825777 BSIMK
6、G Sales - the flame does not propagate to the other side of the support in the first twenty minutes. 3.8 Unless otherwise indicated, alternating voltage and current are indicated in root mean square values. Values of alternating voltage and current 3.9 Line data bus Pair of twisted wires, shielded,
7、having a specified impedance, a matched impedance at its two ends and used for data transport. 3.10 Branch line Section of twisted wires, shielded, with a specified impedance, which connects equipment to a bus line. 3.11 Line coupler Element of electrical or optical connection the purpose of which i
8、s to shunt the transmission signals from a bus line to equipment. 3.12 Line coupler, single Coupler consisting of one line and one branch. 3.13 Line coupler, double Coupler consisting of one line and two branches. 0417JN079413 Page 5 EN 2591:1994 3.14 In-line splice Permanent element of electrical c
9、onnection for Wo-wire cables. 3.1 5 Line termination End line component the purpose of which is to match the bus line to its characteristic impedance. 3.16 Branch termination End branch termination the purpose of which is to eventually replace equipment:. 3.17 Recovery Treatment of a specimen, after
10、 conditioning, so that the properties of the specimen may be stabilized before measuring. 3.18 Beam splitter Device for dividing an optical beam into two separate beams. 3.1 9 Extra optical attenuation caused by the insertion of an extra optical element into an optical system. Insertion loss (of an
11、optical element) 3.20 Launch angle The launch angle is the angle between the wave propagation vector of the incoming light and the normal vector of an optic fibre end face. 3.21 Multimode fibre A multimode fibre is an optical fibre having a large core diameter dimension in relation to the wavelength
12、 of the light, and in which a large number of modes can propagate. 3.22 Optical port The port which radiates or accepts optical power at the interface. 3.23 Fiber optic branching device A device possessing three or more optical ports which shares optical power among its ports in a predetermined fash
13、ion. 3.24 Patchord An assembly where the cable or fibre is terminated at each end with either a plug or socket connector. 3.25 Pigtail A pigtail is a short length of fibre between a component and a transmission fibre, often permanently secured to the component (LED, coupler, connection elements, .).
14、 3.26 Single mode fiber A single mode fibre is an optical fibre in which only one mode can propagate. 0417JN0794T3 94/TOC2 183c Page 6 EN 2591:1994 3.27 Passive coupler A passive coupler is a passive branching device in which power from one or more incoming optical ports is distributed to one or mor
15、e outgoing optical ports. 3.28 Tee coupler An optical fibre tee coupler is a passive coupler or combiner with three optical ports. 3.29 Return loss Light energy reflected back from discontinuities in a fibre optic link. 3.30 Light Launch System (L.L.S.) Device designed to create defined and repeatab
16、le light coupling conditions in a test setup. 3.31 Light Detection System (L.D.S.) Device designed to take repeatable measurements of light transmitted by a test setup, 3.32 Temporary joint Non permanent optical fibre connecting devices for use on equipment. 3.33 Terminator A non-reflective terminat
17、ion of an optical fibre. 3.34 Optical fibre - Core - Cladding - Primary coating - Refractive index profile - Step index fibre - Graded index fibre - Quasi-step index fibre - Core diameter - Cladding diameter - Concentricity error core/cladding - Non circularity of core - Non circularity of cladding
18、- Attenuation - Numerical aperture - Bandwith. For the following terms, see EN 3745-201 4 Standard test conditions 4.1 The test methods are drafted so that the test may be carried out either individually or included in a test sequence. This is why “if applicable“ has been added to the titles “Initia
19、l measurements“ and “Final measurements“. When the test is camed out individually, the measurements are applicable so that the effect of the test on the performances of the specimen can be evaluated. When the test is included in a test sequence, the initial and final states of the specimen shall be
20、checked at the beginning and the end of the test sequence. The initial and final measurements indicated in each test method are thus not applicable to each test. 4.2 Unless otherwise indicated in the test method, technical specification or product standard, the test conditions shall be as follows :
21、- temperature : (23 f 5) “C; - atmospheric pressure : 86 kPa to 106 kPa (860 mbar to 1060 mbar); - relative humidity : 45 % to 75 %. The temperature and humidity shall remain constant throughout a senes of measurements. 0417JN0794T3 Page 7 EN 2591:1994 Unless otherwise indicated in the technical spe
22、cification, the cables used for tests shall be in accordance with EN 2083 and EN 2084 or EN 2234 and EN 2346 and EN 3745. 4.3 Others 4.3.1 Fibre and preparation 4.3.1.1 General The aim of this paragraph is to give recommendations on preparing the ends of fibres, whether terminated or not. It is not
23、intended to describe a precise method for fibre end preparation ; instead it gives the information necessary to describe and quantify fibre and quality. This paragraph is applicable therefore to all tests which require the use of at least one optical interface of this type. It applies to all types o
24、f fibre, silica, plastic or a combination of these and other materials, irrespective of their diameter. 4.3.1.2 Parameters The following parameters define the quality of a fibre end : - surface condition; - perpendicularity of the optical face relative to the axis of symmetry of the fibre; - surface
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