1、t , STD-AECMA PREN 257L-bL7-ENGL 1997 = LOL23LL L3500 40T m AECMA STANDARD NORME AECMA AECMA NORM prEN 2591 -61 7 Edition P 1 October 1997 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (+32) 2 775 81 1 O - Fax. (+32) 2 775 81 1 1 ICs: D
2、escriptors: ENGLISH VERSION Aerospace series Elements of electrical and optical connection Test methods Part 61 7: Optical elements Temperature cycling Srie arospatiale Luft- und Raumfahrt Mthodes dessais Prfverfahren Organes de connexion lectrique et optique Partie 617 : Organes optiques Elektrisch
3、e und optische Verbindungselemente Teil 61 7: Optische Elemente Cycle de temprature Zyklische Temperaturbeanspruchung This “Aerospace Series Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the need
4、s of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physical
5、ly or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardiz
6、ation) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX C2 Chairman I Comments should be sent within six months after the date of rublication to I Edition approved for publication 1997-10-31 AECMA Gu
7、lledelle 94 6-1 200 BRUXELLES Mr Pezzeta I l aecma 199 STD-AECMA PREN 257L-bL7-ENGL 1997 W LOLZ3LL OOL35OL 34b Page 3 prEN 2591-617: 1997 I Scope This standard specifies a method of checking the ability of optical connection elements (including permanent connections) and fibre optic couplers to with
8、stand temperature cycling. It shall be used together with EN 2591-100. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are list
9、ed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 2591-100 Aerospace series
10、 - Elements of electrical and optical connections - Test methods - Part 100: General 1) EN 2591-6101 Aerospace series - Elements of electrical and optical connections - Test methods - Part 6101 : Optical elements - Visual examination 2) EN 2591-602 Aerospace series - Elements of electrical and optic
11、al connections - Test methods - Part 602: Optical elements - Variation of attenuation and optical discontinuity 2) 3 Preparation of specimens 3.1 product standard. Cavities with unterminated contacts shall have filler plugs fitted (where applicable). Specimen shall be fitted with normal accessories
12、and terminated in accordance with the 3.2 - type and length of cable/fibre; - maximum permitted variation of attenuation; - high/low temperatures; - duration of extreme temperatures and rates of change; - number of cycles. Unless otherwise indicated in the technical specification the following detai
13、ls shall be specified: 4 Apparatus Light Launch System (LLS) as defined in EN 2591-100 Light Detector System (LDS) as defined in EN 2591-100 Climatic chamber capable of temperature control of f 3OC 1) In preparation at the date of publication of this standard. It will substitute for EN 2591. 2) Publ
14、ished as AECMA Prestandard at the date of publication of this standard Previous page is blank STD-AECMA PREN 2593-bL7-ENGL 1777 9 1012333 0033502 282 9 Page 4 prEN 2591 -61 7: 1997 5 Method 5.1 Initial measurements - Measure the variation of attenuation (EN 2591-602, method A) continuously throughou
15、t the test; - Place the specimen in climatic chamber (at time to) - Bring the temperature levei to TA value during period (ti - to) - Maintain at TA temperature during period (t2- t,) - Change the temperature to T, during period (t3- t,) - Maintain a T, temperature during period (t4- t3) - Change th
16、e temperature to ambient temperature during period (t5- t4) - Maintain at ambient temperature during period (te- t5). These phases constitute one basic cycle (see figure 1) whose parameters are given in the product specification Unless otherwise specified in the product standard: - rate of temperature variation : 5OC/min; - (t,- ti) = (t4- t3) = (te- t5) = 30 min. 5.2 Final measurements and requirements The specimen shall be examined in accordance with the test: EN 2591-6101 Visual examination Figure 1: Basic cycle
