ASD-STAN TR 4646-2008 Aerospace series Termination procedure for EN 4531 optical contact (Edition 1)《航空航天系列 EN 4531光触点的端接程序 第1版》.pdf
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1、ASD Technical Report Rapport Technique ASD ASD Fachbericht TR 4646 Edition 1 December 2008 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 763 3565 - www.asd-stan.orgICS: Descripto
2、rs: ENGLISH VERSION Aerospace series Termination procedure for EN 4531 optical contact Srie arospatiale Procdure de cblage pour contact optique EN 4531 Luft- und Raumfahrt Montageanleitung, fr Kontakte nach EN 4531 This Technical Report was drawn up by the Electrical Domain of ASD-STAN. The reason w
3、hich led to the publication of the document as a Technical Report is explained in the foreword. Edition approved for publication 31 December 2008 Electrical Domain Copyright 2008 by ASD-STAN Page 2 TR 4646:12-08 Contents Page Foreword2 1 EN 4531-101 contact terminus assembly 3 2 Normative references
4、 3 3 Safety summary .3 4 Cable and fibre preparation3 5 Installation of the EN 4531 contact onto the fibre6 6 Fibre cleave . 11 7 Fibre end polishing. 11 7.1 General definitions before starting. 11 7.2 Coarse polishing. 13 7.3 Fine polishing AUTOMATIC. 13 7.4 Quality check. 13 8 Installation of the
5、terminus into a circular connector. 16 9 Insertion of the EN 4531-101 contact terminus into a rectangular ARINC style connector. 18 Foreword The main task of ASD-STAN Technical Committees is to prepare EN Standards, in exceptional circumstances however, the publication of Technical Report of one of
6、the following types may be proposed: Type 1, the subject is still under technical development requiring wider exposure; Type 2, a Technical Committee has collected data of a different kind from that which is normally published as a European Standard. The Electrical Domain decided to publish this doc
7、ument in the form of a Technical Report of type 2 in order to facilitate the updating of this document. Page 3 TR 4646:12-08 1 EN 4531-101 contact terminus assembly This termination process defines the stages to reach the minimum qualification requirements for the EN 4531 contact in accordance with
8、EN 4531-001. Other processes could be applied if they conform to the minimum qualification requirements and with common agreement between manufacturer and user. This standard aims at cable termination within manufacturing facility. CAUTION Training and qualification of personnel terminating fibre op
9、tic contacts is mandatory. Throughout the termination process, cleanliness is critical to obtain high optical quality termination. Ensure that work areas are kept as clean as possible to minimize the ingress of dirt into the connector parts. NOTE Verify that the epoxy adhesive shelf life has not exp
10、ired. Do not use epoxy adhesive with an expiration date that has passed. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the reference
11、d document (including any amendments) applies. EN 4531-001, Aerospace series Connectors, optical, circular, single and multipin, coupled by threaded ring Flush contacts Part 001: Technical specification. EN 4531-101, Aerospace series Connectors, optical, circular, single and multipin, coupled by thr
12、eaded ring Flush contacts Part 101: Optical contact for EN 4641-100 cable 55 C to 125 C Product standard. 3 Safety summary The following safety precautions shall be observed: a) Safety glasses shall be worn at all times when handling bare fibres or dispensing epoxy adhesive. b) To reduce the chance
13、of skin contamination wear suitable disposable gloves i.e. surgical latex gloves. c) Do not touch the ends of the fibre as they may puncture the skin. Wash the hands after handling bare fibre. d) Avoid skin contact with epoxy adhesives. e) Never look directly into the end of a fibre. Before inspecti
14、ng the end face of a fibre, verify that the fibre is not emitting energy or use a microscope with integrated camera. 4 Cable and fibre preparation Step 1 Before termination, clean minimum of 10 cm of the outer jacket of the cable end with a suitable optical quality cleaning solution (for example Iso
15、propyl Alcohol (IPA) impregnated wipes, or a lint free cloth dampened with the cleaning solution). Page 4 TR 4646:12-08 Cut the cable at an angle to facilitate the installation of the boot, see Figure 1. No strength member should protrude from the cable end. Figure 1 Cut cable at an angle Step 2 Ins
16、tall the cable marker sleeve and the supplied crimp sleeve, over the simplex cable (single fibre cable). Slide the cable marker sleeve, strain relief boot and the spring back from the end of the simplex cable. See Figure 2. Key 1 Wire marker sleeve 2 Simplex cable 3 Spring 4 Strain relief boot Figur
17、e 2 Installing cable marker sleeve, strain relief boot and spring 2 FO 123 (Tx) DDFR 1 4 3Page 5 TR 4646:12-08 Step 3 Mark the simplex cable outer jacket to 20 mm and to 25 mm, mark the cable as shown in Figure 3 below. Dimensions in millimetres Key 1 Mark 2 Optical fibre 3 Buffer 4 Aramid yarn 5 Ca
18、ble jacket Figure 3 EN 4531-101 contact cable stripping dimensions Step 4 Remove the simplex cable jackets back to 20 mm using the simplex cable stripper and trim the aramid yarn using the strength member shears so that only 1 mm is left from the jacket. NOTE The optimum way to remove the simplex ca
19、ble jackets is to ring cut the jacket with the simplex cable stripper and pull the jacket off by hand. Pushing off the simplex cable jacket with a tightly held simplex cable stripper can lead to fibre breakage. WARNING Wear safety glasses when removing the fibre buffer and coating to avoid possible
20、eye injury. Step 5 Mark the buffer at 17 mm. Remove the fibre buffer and coatings back to 17 mm using the buffer stripper. Remove the buffer and coating in small sections approximately 6 mm at a time. NOTE Normally, the buffer and coating are tightly adhered to one another and come off of the fibre
21、at the same time. CAUTION The uncoated fibre is in its most vulnerable state. Take extreme care not to damage the fibre. Breakage of any one fibre from this point until the connector is completely assembled will require repetition of this and the following steps in order to maintain approximately eq
22、ual length of all the fibres in the cable. 3+ 0 1 2 45 1 17 192083+ 0 1 Page 6 TR 4646:12-08 Step 6 Remove any residual coating material from the bare fibres with a wipe dampened with a quality optical cleaning solution. Wipe only once from the end of the buffer towards the end of the fibre. NOTE 1
23、Do not repeatedly wipe the bare fibre, as this will weaken the fibre. NOTE 2 Silicone coated fibres may require additional cleaning to ensure all of the silicone coating has been removed to ensure proper adhesion within the contact ferrule. 5 Installation of the EN 4531 contact onto the fibre NOTE 1
24、 This procedure describes the process for installing EN 4531 contact onto multimode fibres. Epoxy adhesive is used to secure the fibre in the contact for mating purposes. The manufacturers cure schedules should be closely followed for maximisation of the polymerisation process. NOTE 2 Step 1 below n
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