BS EN 16602-70-18-2014

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BSEN16602 70 18 2014
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BSI Standards Publication BS EN 16602-70-18:2014 Space product assurance — Preparation, assembly and mounting of RF coaxial cablesBS EN 16602-70-18:2014 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 16602-70-18:2014. The UK participation in its preparation was entrusted to Technical Committee ACE/68, Space systems and operations. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. © The British Standards Institution 2014. Published by BSI Standards Limited 2014 ISBN 978 0 580 84593 2 ICS 49.090; 49.140 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2014. Amendments issued since publication Date Text affectedBS EN 16602-70-18:2014EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 16602-70-18 October 2014 ICS 49.090; 49.140 English version Space product assurance - Preparation, assembly and mounting of RF coaxial cables Assurance produit des projets spatiaux - Préparation, assemblage et montage des câbles radiofréquence coaxiaux Raumfahrtproduktsicherung - Vorbereitung, Zusammenbau und Befestigung von RF-Koaxial-Kabeln This European Standard was approved by CEN on 11 April 2014. CEN and CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN and CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN and CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels © 2014 CEN/CENELEC All rights of exploitation in any form and by any means reserved worldwide for CEN national Members and for CENELEC Members. Ref. No. EN 16602-70-18:2014 EBS EN 16602-70-18:2014 EN 16602-70-18:2014 (E) 2 Table of contents Foreword 5 Introduction 6 1 Scope . 7 2 Normative references . 8 3 Terms, definitions and abbreviated terms 9 3.1 Terms from other standards 9 3.2 Terms specific to the present standard . 9 3.3 Abbreviated terms. 9 4 Principles and prerequisites of reliable soldered or crimped cable connections . 10 4.1 Principles of reliable soldered or crimped semi-rigid cable connections 10 4.2 Prerequisites for assembly and mounting of semi-rigid coaxial cables 10 4.3 Alternative coaxial cable technologies 11 5 Requirements 12 5.1 Preparatory conditions 12 5.1.1 Facility cleanliness 12 5.1.2 Environmental conditions 12 5.1.3 Lighting requirements 13 5.1.4 Equipment and tools . 13 5.2 Material selection 15 5.2.1 Solder . 15 5.2.2 Flux . 16 5.2.3 Solvents 16 5.2.4 Cable selection . 17 5.2.5 Connector selection 17 5.3 Preparation of semi-rigid cable . 18 5.3.1 General . 18 5.3.2 Inspection of cable 18 5.3.3 Cutting cable to initial oversize length . 18 BS EN 16602-70-18:2014 EN 16602-70-18:2014 (E) 3 5.3.4 Cable forming and minimum bend radius 18 5.3.5 Preconditioning heat treatment 19 5.3.6 Trimming cable to final length . 20 5.3.7 Stripping the cable ends 21 5.3.8 Inspection of stripped cable ends 21 5.4 Preparation for soldering assembly of semi-rigid cables . 22 5.4.1 General . 22 5.4.2 Degolding and pretinning 22 5.4.3 Solder preforms 23 5.5 Assembly of connectors to RF coaxial cables . 24 5.5.1 Solder assembly of semi-rigid cables 24 5.5.2 Crimp assembly of semi-rigid cables and other assembly techniques . 28 5.5.3 Completed assemblies 28 5.6 Mounting of cables 29 5.6.1 Semi-rigid cables with straight solder-type connectors 29 5.6.2 Semi-rigid cables with right-angle connectors . 30 5.6.3 Other cable mounting technologies . 30 5.7 Process verification . 31 5.7.1 General . 31 5.7.2 Temperature cycling 31 5.7.3 Vibration 31 5.8 Quality assurance . 31 5.8.1 Data 31 5.8.2 Nonconformance . 32 5.8.3 Calibration . 32 5.8.4 Traceability . 32 5.8.5 Workmanship standards 32 5.8.6 Inspection . 32 5.8.7 Operator and inspector training and certification . 33 Annex A (normative) Logbook – DRD . 34 A.1 DRD identification . 34 A.1.1 Requirement identification and source document 34 A.1.2 Purpose and objective . 34 A.2 Expected response . 34 A.2.1 Scope and content 34 A.2.2 Special remarks 34 Annex B (normative) Workmanship standards 35 BS EN 16602-70-18:2014 EN 16602-70-18:2014 (E) 4 B.1 Overview 35 B.2 Illustrations . 35 Annex C (informative) Graphical information . 37 C.1 Overview 37 C.2 Typical cable cut-off fixture . 37 C.3 Typical cable-forming tool . 38 C.4 Approved and non-approved straight solder-type cable-end connectors . 39 C.5 Method of producing solder performs 40 C.6 Centre contact assembly 40 Bibliography . 41 Figures Figure B-1 : Photograph showing non-captive nut and preferred solder fillet 35 Figure B-2 : Microsection through preferred solder fillet, revealing full penetration of solder path . 35 Figure B-3 : Unacceptable solder fillet dimensions . 36 Figure C-1 : Typical cable cut-off fixture . 37 Figure C-2 : Typical cable-forming tool . 38 Figure C-3 : Approved and non-approved straight solder-type cable-end connectors . 39 Figure C-4 : Method of producing solder preforms 40 Figure C-5 : Centre contact assembly 40 Tables Table 5-1: Design rules for minimum bend radius . 19 Table 5-2: Preconditioning heat treatment process . 20 BS EN 16602-70-18:2014 EN 16602-70-18:2014 (E) 5 Foreword This document (EN 16602-70-18:2014) has been prepared by Technical Committee CEN/CLC/TC 5 “Space”, the secretariat of which is held by DIN. This standard (EN 16602-70-18:2014) originates from ECSS-Q-ST-70-18C. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2015, and conflicting national standards shall be withdrawn at the latest by April 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This document has been developed to cover specifically space systems and has therefore precedence over any EN covering the same scope but with a wider domain of applicability (e.g. : aerospace). According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 16602-70-18:2014 EN 16602-70-18:2014 (E) 6 Introduction The main part of this Standard is based on industrial experience and recommendations from European soldering technology experts. Modifications are incorporated into the text to provide for the specific requirement of low-outgassing electrical systems which are required by scientific and application satellites. Other additions were made in the light of recent technological advances and results of metallurgical test programmes. The use of processes other than solder assembly is recognized, but only certain general requirements are given in this Standard. These requirements apply to assemblies designed to operate within the temperature limits from -45 °C to +85 °C. More extreme temperatures or other unusual environmental applications require special design measures or processing steps to provide environmental survival capability. BS EN 16602-70-18:2014 EN 16602-70-18:2014 (E) 7 1 Scope This Standard defines the technical requirements and quality assurance provisions for the assembly and mounting of high-reliability, radio-frequency (RF) coaxial-cable interconnections for use as transmission lines in spacecraft and associated equipment. In general, these assemblies are designed for low-loss, stable operation from the relatively low frequencies through the higher frequencies in the microwave regions. These transmission-line cables should not be confused with low-frequency cables with conductive sheaths (usually copper braid), which are used in applications where shielding of the centre conductors from the surrounding electrical ambient is required. The interconnection of those shielded cables, not covered by the present standard, is covered in ECSS-Q-ST-70-08. This standard may be tailored for the specific characteristics and constrains of a space project in conformance with ECSS-S-ST-00. BS EN 16602-70-18:2014 EN 16602-70-18:2014 (E) 8 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this ECSS Standard. For dated references, subsequent amendments to, or revision of any of these publications do not apply, However, parties to agreements based on this ECSS Standard are encouraged to investigate the possibility of applying the more recent editions of the normative documents indicated below. For undated references, the latest edition of the publication referred to applies. EN reference Reference in text Title EN 16601-00-01 ECSS-S-ST-00-01 ECSS system — Glossary of terms EN 16602-10-09 ECSS-Q-ST-10-09 Space product assurance — Nonconformance control system EN 16602-20 ECSS-Q-ST-20 Space product assurance — Quality assurance EN 16602-60 ECSS-Q-ST-60 Space product assurance — Electrical, electronic and electromechanical (EEE) components EN 16602-70-02 ECSS-Q-ST-70-02 Space product assurance — Thermal vacuum outgassing test for the screening of space materials EN 16602-70-08 ECSS-Q-ST-70-08 Space product assurance — Manual soldering of high-reliability electrical connections EN 16602-70-26 ECSS-Q-ST-70-26 Space product assurance — Crimping of high-reliability electrical connections EN 16602-70-28 ECSS-Q-ST-70-28 Space product assurance — Repair and modification of printed circuit board assemblies MIL-C-17G(3) SUP1 General specification for cables, radio frequency, flexible and semi-rigid. (8 Jan 1996) BS EN 16602-70-18:2014 EN 16602-70-18:2014 (E) 9 3 Terms, definitions and abbreviated terms 3.1 Terms from other standards For the purpose of this Standard, the terms and definitions from ECSS-S-ST-00-01 apply, in particular for the following terms: requirement 3.2 Terms specific to the present standard 3.2.1 minimum bend radius inside radius of the bend measured on the outer surface of the cable 3.3 Abbreviated terms For the purpose of this Standard, the abbreviated terms from ECSS-S-ST-00-01 and the following apply: Abbreviation Meaning FEP fluorinated ethylene propylene PTFE polytetrafluoroethylene SMA sub miniature version A VSWR voltage standing wave ratio BS EN 16602-70-18:2014 EN 16602-70-18:2014 (E) 10 4 Principles and prerequisites of reliable soldered or crimped cable connections 4.1 Principles of reliable soldered or crimped semi-rigid cable connections Reliable soldered or crimped connections result from proper design, control of tools, materials and work environments and careful workmanship. The basic design concepts, adherence to which ensures reliable connections and prevents joint failure, are: a. Avoidance of dimensional mismatch between the coaxial-cable assembly and the units being connected; i.e. not forcing the semi-rigid cable assembly into position and thereby cracking or pre-stressing one of the joints. b. Use of cable-end connectors with retractable (non-captive) coupling nuts; after completion of mounting, the coaxial-cable assembly is not in a state of tension resulting from axial movement when the connectors are threaded together. c. Minimizing the internal stresses on the soldered or crimped connections resulting from exposure to thermal cycling. NOTE The thermal coefficient of expansion of the dielectric is about ten (10) times that of copper and in service this can introduce a tensile stress on the joint. d. The various assembly and mounting processes are covered by quality-control inspection steps. 4.2 Prerequisites for assembly and mounting of semi-rigid coaxial cables Each supplier maintains documented soldering or crimping programmes which meet the requirements of this Standard for the types of connections employed and the articles involved. The programmes include procedures for training, certification, maintenance of certified status, recertification and revocation of certified status for soldering, crimping and inspection personnel. The supplier also prepares and has readily available workmanship standards consisting of BS EN 16602-70-18:2014 EN 16602-70-18:2014 (E) 11 satisfactory work samples or visual aids which clearly illustrate the quality characteristics for all connections involved, including the applicable illustrations in Annex B of this Standard. Records are kept to provide identification between the finished product and the operator. Records are also maintained of the training, testing and certification status of assembly operators. Records are retained for at least one year, or longer if this is a specific requirement of the customer’s project. Equipment and tools are verified and calibrated periodically for proper operation, and records of tool calibration and verification are maintained (see clause 5.8). For soldering or crimping requirements not covered in this Standard, the supplier submits a process procedure including all pertinent quality requirements to the customer’s relevant project office for approval in accordance with ECSS-Q-ST-70. 4.3 Alternative coaxial cable technologies Alternative coaxial cable technologies are accepted for application in individual customer programmes following the completion of qualification and batch acceptance test programmes in accordance with clause 5.
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