1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM ASD-STAN prEN 2591-228 Edition P 1 February 2017 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Rue Montoyer 10 - 1000 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 775 8131 - www.asd-stan.orgICS: Descriptors:
2、ENGLISH VERSION Aerospace series Elements of electrical and optical connection Test methods Part 228: Ferrule withdrawal force Luft- und Raumfahrt Elektrische und optische Verbindungselemente Prfverfahren Teil 228: Auszugskraft der Ferrule Srie arospatiale Organes de connexion lectrique et optique M
3、thodes dessais Partie 228 : Force dextraction de la frule This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It ha
4、s been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the s
5、tandard. After examination and review by users and formal agreement of ASD-STAN, the ASD-STAN prEN will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have th
6、en to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. ASD-STAN Technical Committee approves that: “This document is published by ASD-STAN for the needs of the European Aerospace Industry. The use
7、 of this standard is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” ASD-STAN reviews each standard and technical report at least every five years at which time it may be r
8、evised, reaffirmed, stabilized or cancelled. ASD-STAN invites you to send your written comments or any suggestions that may arise. All rights reserved. No parts of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, ph
9、otocopying, recording, or otherwise, without prior written permission of ASD-STAN. Order details: E-mail: salesasd-stan.org Web address: http:/www.asd-stan.org/ Edition approved for publication 1stFebruary 2017 Comments should be sent within six months after the date of publication to ASD-STAN Elect
10、rical Domain Copyright 2017 ASD-STAN prEN 2591-228:2017 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 General description 3 4 Preparation of specimens 3 5 Apparatus. 4 6 Testing 6 7 Calculation or interpretation of results 6 Annex A (informative) Precaution, recommendation on t
11、he apparatus . 7 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. pr
12、EN 2591-228:2017 (E) 3 1 Scope This standard describes the procedure to measure the withdrawal force between the ferrule of an optical contact and the resilient alignment sleeve located inside the connector. This method is suitable for use for resilient alignment sleeve qualification. It shall be us
13、ed together with EN 2591-100. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced
14、 document (including any amendments) applies. EN 2591-100, Aerospace series Elements of electrical and optical connection Test methods Part 100: General 3 General description The contact force between the mating ferrules in a fibre optic connector is the difference between the breakaway frictional f
15、orce and the spring force of the connector. To maintain contact, the breakaway friction force shall remain below the spring force. The ferrule withdrawal force is a breakaway frictional force between the ferrule and the sleeve. This force is small and can be affected by numerous parameters like the
16、climatic conditions, the design of the apparatus, the pin gauges, the cleanliness of the specimens, the Van Der Waals forces, and the roughness of specimens. The criteria to be applied to the results of these measurements account for the spread that is inherent in the preparation of specimens. 4 Pre
17、paration of specimens Unless otherwise indicated in the product standard, specimens shall be prepared as below: The specimens and apparatus shall be subjected to standard test conditions as defined in EN 2591-100; The specimens and gauge pins shall be perfectly clean and dry; Prior to testing, each
18、sleeve and gauge pin shall be cleaned by wiping, using for example lint-free wipes. The cleaning action shall consist of thorough rubbing or scrubbing. Moistening wipes should be avoided. If moistening is necessary no alcohol shall be used, and following cleaning, adapters and gauge pins are precond
19、itioned at 40 C for 30 minutes and then returned to room temperature for at least 30 minutes. It is strongly recommended to wear gloves to avoid any risk of grease deposit on the specimens and gauge pins. prEN 2591-228:2017 (E) 4 Unless otherwise indicated in the technical specification, the followi
20、ng details shall be specified in the product standard: Min. and max. value of the sleeve withdrawal force in Newton; Gauge pin material and dimensions (not required for Zirconia sleeves for ferrule 1,25 mm or 2,5 mm); Value and tolerance of the external diameter; Length of the chamfer; Roughness; Ro
21、undness; Material. 5 Apparatus 5.1 General The specimen is a connector alignment sleeve. The measurement is made with two gauge pins inserted so they meet at the centre of the sleeve. Force is applied between one of the gauge pins and the sleeve as shown in Figure 1. The apparatus comprises: A force
22、 generator with a mechanism that generates a continuously increasing force and is equipped with a force gauge to record continuously the force and the movement of the mobile gauge pin. Loading rates of approximately 100 mm/min are generally considered acceptable for mechanically driven instruments.
23、A test assembly with a flexible member to apply the force on the mobile gauge and insure that the force generated will not induce a bending load on the specimen. A pair of gauge pins. prEN 2591-228:2017 (E) 5 Key 1 Mobile gauge pin 2 Fixed gauge pin 3 Sleeve 4 Applied force 5 Stop Figure 1 Test unit
24、 with applied force 5.2 Gauge pin dimensions The following material and dimensions of gauge pins are defined for Zirconia sleeve dedicated to 1,25 mm or 2,5 mm ferrules. For other sleeves, the dimensions of the gauge pins shall be as specified in the product standard The length of the gauge pin shal
25、l be sufficient to allow it to extend half-way into the sleeve and have enough left protruding out of the sleeve to allow for the attachment of a fixture or force generator; The chamfer of the gauge pin shall be on the end that is inserted in the sleeve, and is measured in the radial direction; Mate
26、rial of the gauge pin: Zirconia; Surface finish (Ra): 0,2 m max.; Roundness: 0,2 m max.; Diameter: 1,249 m or (2,499 0,2) m; Chamfer: 0,05 mm to 0,15 mm without burrs in the transition area with the cylindrical surface; When pin gauges are reversed, the difference between measurements shall not be m
27、ore than 10 %. 5.3 Position of the specimen The specimen is a sleeve with two gauge pins inserted so as to touch at the centre of the specimen; The interface between the two gauge pins shall be located within 10 % of the length of the specimen from the centre of the specimen itself. prEN 2591-228:20
28、17 (E) 6 6 Testing To compensate for the weight of the test assembly, the indicator on the force gauge shall be adjusted to zero. Force is to be applied at a continuously increasing rate. Key 1 Force (N) 2 Random Peak 3 Linear area = X % of measured range 4 Displacement (mm) 5 Measured range 6 Withd
29、rawal force (WF) Figure 2 Traction curve obtained from force generator The withdrawal force shall be calculated to remove nonlinear areas of the figure obtained. The linear area (X) shall be 50 % of the total length per Figure 2 unless specified in the product standard. The withdrawal force (WF) can
30、 be expressed with the formula below: WF (F3 F4)/2 (F3 F4)/2X (WF (3 F3 F4)/2 if X 50 %) 7 Calculation or interpretation of results Unless otherwise specified in the product specification, three withdrawal force measurements from both sides of the sleeve are required. It is accepted to remove absurd
31、 values if necessary. The mean value set of data from the end of the sleeve with the higher values of withdrawal force shall be used to characterize the sleeve. 30 samples are generally considered. prEN 2591-228:2017 (E) 7 Annex A (informative) Precaution, recommendation on the apparatus Care should
32、 be taken on the following influencing factors when designing a measuring procedure. Pin gauge: Diameter and tolerance of pin gauges, variation of diameter between pin gauges, roughness of pin gauges, roundness of pin gauges, value of the chamfer of the pin gauges, wear of the pin gauges. Apparatus:
33、 Position of pin gauge relative to sleeve centre, angular position of the slot of the sleeve, velocity of the crosshead, system stiffness, capture speed of the force gauge, design of the sleeve stop on the apparatus, weight of pin gauges assemblies, alignment between force applied and sleeve axis. O
34、ther: Number of measurement per sleeve end, calculation method, cleaning method: wet or dry cleaning, humidity and temperature, air flow. prEN 2591-228:2017 (E) 8 Bibliography EN 60512-1, Connectors for electronic equipment Tests and measurements Part 1: General (IEC 60512-1:2001) IEC 60050-581, Int
35、ernational Electrotechnical Vocabulary Chapter 581: Electromechanical components for electronic equipment. The following available standards are used in the telecom industry to measure the ferrule withdrawal force. IEC 61300-3-33, Examination and measurement Ferrule withdrawal force First edition 1999-04 TIA/EIA 455-158, Measurement of breakaway frictional force in fiber optic connector alignment sleeves Initial publication September 5, 1997, reaffirmed October 22, 2001
