1、 STD-BSI BS EN bL300-2-27-ENGL 1977 e Lb24669 Ob118123 824 W BRITISH STANDARD Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2.27. Tests - Dust - Laminar flow The European Standard EN 61300-2-27 : 1997 has the status of a British Standard ICs
2、33.180.20 BS EN 1997 1995 61300-2-27 : IEC 61300-2-27 : NO COPYING WITH F BS EN 61300-2-27 : 1997 This British Standard, having been prepared under the direction of the Eleckotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 October 1997 O B
3、SI 1997 ISBN O 680 28570 7 National foreword This British Standard is the English ianguage version of EN 61300-2-27 : 1997. It is identical with EC 61300-2-27 : 1995. The UK participation in its preparation was entmsted by Technical Committee EPV86, Fibre optics, to Subcommittee EPU86/2, Interconnec
4、ting devices and passive components, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible internationallEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed - monitor related international
5、 and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretaqy. Rom 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60
6、27-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international
7、 publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitied International Standards Correspondence Index, or by using the Fnd facility of the BS
8、I Standards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5, a blank page, an inside back cover and a back cover. Amendme
9、nts issued since publication AmdNo. Date I Text affected EUROPEAN STANDARD NORME EUROPEENNE EUROPISCHE NORM EN 61 300-2=27 August 1997 ICC 33.180.20 English version Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 2-27: Tests - Dust - Laminar flow
10、 (IEC 6 1 300-2-27: 1 995) Dispositifs dinterconnexion et composants passifs fibres optiques Mthodes fondamentales dessais et de mesures Partie 2-27: Essais - Poussire Lichtwellenleiter - Verbindungselemente und passive Bauteile - Grundlegende Prf- und Meverfahren Teil 2-27: Prfungen: Staub - Lamina
11、re Strmung Ecoulement laminaire (IEC 61300-2-27:1995) (CE1 61 300-2-27:1995) This European Standard was approved by CENELEC on 1997-07-01. 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 na
12、tional standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version
13、 in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, Fran
14、ce, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain. Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electtotechnique Europisches Komitee fr Elektrotechnische Normung Cen
15、tral Secretariat: rue de Stassart 35, B - 1050 Brussels 1997 CENELEC - All rights of exploitation in any form and by any means resewed worldwide for CENELEC members. Ref. No. EN 61 300-2-27:1997 E STD-BSI BS EN bL300-2-27-ENGL 1777 m Lb24bb7 Ob48LZb 533 Page 2 EN 61300-2-27 : 1997 Foreword The text
16、of the International Standard IEC 61 300-2-27:1995, prepared by SC 868, Fibre optic interconnecting devices and passive components, of IEC TC 86, Fibre optics, was submitted to the formal vote and was approved by CENELEC as EN 61 300-2-27 on 1997-07-01 without any mod if ication. The following dates
17、 were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement with the EN have to be withdrawn - latest date by which the national standards conflicting (dopl 1998-06-01 (daw) 1 998-06-0 1 Endorsement notice The
18、text of the International Standard IEC 61 300-2-27:1995 was approved by CENELEC as a European Standard without any modification. * Ln * STD-BSI BS EN bL300-2-27-ENGL 1777 LbZYbb9 ObllBJ27 47 Page 3 EN 61300-2-27 : 1997 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS - BASIC TEST AND MEASU
19、REMENT PROCEDURES - Part 2-27: Tests - Dust - Laminar flow 1 General 1.1 Scope and object The purpose of this part of IEC 1300 is to determine the effects of dust on fibre optic devices. 1.2 General description The specimen is exposed to a specified dust concentration within a conditioning chamber i
20、n which the air is circulated over a period of time. 2 Apparatus The apparatus consists of the following elements. 2.1 Test chamber The test chamber shall be capable of controlling the dust concentration, velocity, temperature, and humidity of the dust-laden air:lt shall be capable of being raised t
21、o and maintained at a temperature of 63 OC f 2 OC with a relative humidity not exceeding 60 %. In order to provide adequate circulation of the dust-laden air, no more than 50 % of the cross- sectional area (normal to the air flow) and no more than 30 % of the volume of the chamber shall be occupied
22、by the test specimen. The dust-laden air shall be introduced into the chamber in such a manner as to allow it to become approximately laminar in flow before it strikes the specimen. 2.2 Dust The dust shall be capable of passing through a sieve of 150 pm aperture. 3 Procedure The preparation of the s
23、pecimen shall be in accordance with the detail specification. Unless otherwise specified, the specimen shall be subjected to the test in a non-operational mode. 3.1 Position the specimen as near to the centre of the test chamber as practicable. If more than one specimen is being tested, there shall
24、be a minimum clearance of 100 mm between surfaces of the specimens and any other object or material which would provide protection. No surface of the test specimen shall be any closer than 100 mm to any wall of the test chamber. The test specimen shall beOorientated to expose the most critical or vu
25、lnerable parts to the dust stream. Changes in specimen orientation during the test shall be specified in the detail specification. STD-BSI BS EN bL300-2-27-ENGL 1997 lb24bb7 Ob48128 30b Page 4 EN 61300-2-27 : 1997 3.2 Set the chamber controls to maintain an internal chamber temperature of 23 C; f 2
26、G and a relative humidity of less than 22 %. Adjust the air velocity to 530 m/min f 70 mlmin. Adjust the dust feeder to control the dust concentration to the specified severity. Maintain these chamber conditions for the specified duration. 3.3 Upon completion of the initial conditioning period, stop
27、 the dust feed and reduce the air velocity to 90 m/min f 50 m/min. Raise the internal chamber temperature to 63 OC f 2 OC. Maintain a relative humidity of less than 10 %. Maintain these chamber conditions for the specified duration. 3.4 Upon completion of the intermediate conditioning period, mainta
28、in the temperature at 63 OC f 2 OC. Increase the air velocity to 530 m/min f 70 m /min. Adjust the dust feeder to control the dust concentration to the specified severity. Maintain a relative humidity of less than 10 %. Maintain these chamber conditions for the specified tluration. 3.5 Upon completi
29、on of the test, turn off all chamber controls and allow the specimen to return to standard ambient conditions. Remove accumulated dust from the specimen by brushing, wiping or shaking, exercising care to avoid introducing any additional dust into the test specimen. Dust shall not be removed by eithe
30、r air blast or vacuum cleaning. 3.6 The specimen shall be examined and all necessary observations recorded as specified in the detail specification. Careful attention shall be given to those specimens which contain bearings, seals, lubricants, etc. Where applicable, prior to remating interconnecting
31、 devices, normal cleaning procedures may be used to remove any residual dust. 4 Severity The severity consists of the dust concentration and duration of exposure. The severity shall be specified in the detail specification. The following preferred severities are non-mandatory severities which may be
32、 specified for this procedure: COncenIratbn Dutatkn h 1 2 4 6 8 12 16 I I 24 - STD-BSI BS EN b2300-2-27-ENGL L777 Lb24bb7 Ob4AL29 242 Page 5 EN 61300-2-27 : 1997 5 Details to be specified The following details, as applicable, shall be specified in the detail specification: Duration of exposure Chang
33、e in orientation of specimen(s) Specimen optically functioning or non-functioning Specimen mated or unmated Dust characteristics (e.g. type size) Pre-conditioning procedure Post-conditioning procedure Initial examinations and measuremmts and performance requirements Examinations and measurements dur
34、ing test and performance requirements Final examinations and measurements and performance requirements Deviations from test procedure Additional pass/fail criteria STD-BSI BS EN b1300-2-27-ENGL 1997 Lb24bh7 Oh118330 Tb4 BS EN 1997 1995 61300-2-27 : IEC 61300-2-27 : BSI 389 Chiswick High Road London
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