1、BRITISH STANDARD BS EN 61300-3-8:1997 IEC 61300-3-8: 1995 Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3.8: Examinations and measurements Ambient light susceptibility The European Standard EN 61300-3-8:1997 has the status of a British Standard
2、 ICS 33.180.20BSEN61300-3-8:1997 This British Standard, having been prepared under thedirectionof the Electrotechnical Sector Board,waspublished under theauthority of the StandardsBoard and comes into effect on 15November1997 BSI 04-2000 ISBN 0 580 28476 X National foreword This British Standard is
3、the English language version of EN61300-3-8:1997. It is identical with IEC61300-3-8:1995. The UK participation in its preparation was entrusted by Technical Committee EPL/86, Fibre optics, to Subcommittee EPL/86/2, Interconnecting devices and passive components, which has the responsibility to: aid
4、enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizatio
5、ns represented on this subcommittee can be obtained on request to its secretary. From1 January1997, all IEC publications have the number60000 added to the old number. For instance, IEC27-1 has been renumbered as IEC60027-1. For a period of time during the change over from one numbering system to the
6、 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 publications with their corresponding European publications. The British Standard
7、s which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to incl
8、ude all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. 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, pages
9、 i and ii, theEN title page, pages 2 to 5 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN61300-3-8:1
10、997 BSI 04-2000 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 61300-3-8 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61300-3-8 August 1997 ICS 33.180.20 English version Fibre optic interconnecting devices and passive components Basic test and measurement
11、 procedures Part 3-8: Examinations and measurements Ambient light susceptibility (IEC 61300-3-8:1995) Dispositifs dinterconnexion et composants passifs fibres optiques Mthodesfondamentales dessais et de mesures Partie 3-8: Examens et mesures Immunit lclairement extrieur (CEI 61300-3-8:1995) Lichtwel
12、lenleiter Verbindungselemente undpassive Bauteile Grundlegende Prf- und Meverfahren Teil 3-8: Untersuchungen und Messungen Streulichtempfindlichkeit (IEC 61300-3-8:1995) This European Standard was approved by CENELEC on 1997-07-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Re
13、gulations 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 Central Secretariat or to any CENELEC member.
14、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 CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC mem
15、bers are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit E
16、uropen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1997 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61300-3-8:1997 EEN61300-3-8:1997
17、 BSI 04-2000 2 Foreword The text of the International Standard IEC61300-3-8:1995, prepared by SC86B, Fibre optic interconnecting devices and passive components, of IECTC86, Fibre optics, was submitted to the formal vote and was approved by CENELEC as EN61300-3-8 on1997-07-01 without any modification
18、. The following dates were fixed: Endorsement notice The text of the International Standard IEC61300-3-8:1995 was approved by CENELEC as a European Standard without any modification. Contents Page Foreword 2 1 General 3 1.1 Scope and object 3 1.2 General description 3 2 Apparatus 3 3 Procedure 4 4 D
19、etails to be specified 5 Figure 1 Apparatus and test arrangement 3 Figure 2 4 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1998-06-01 latest date by which the national standards conflicting with the EN ha
20、ve to be withdrawn (dow) 1998-06-01EN61300-3-8:1997 BSI 04-2000 3 1 General 1.1 Scope and object The purpose of this part of IEC1300 is to measure the susceptibility of a fibre optic device to the coupling of light into the optical channel(s) from external light sources. 1.2 General description This
21、 procedure simulates an idealized illumination of a fibre optic device (including its associated fibre pigtails) by an external light source and measures the amount of light coupled into one or more of the light channels of the device per unit of illumination intensity (irradiance). 2 Apparatus The
22、apparatus and measuring arrangement are shown inFigure 1. The apparatus shall consist of the following elements. 2.1 Light source This is a non-coherent source of light with a spectral range covering the wavelengths of systems operation of the specimen. Since the expected susceptibility of the major
23、ity of fibre optic devices to coupling of ambient light is very small, this shall normally be an intense light source capable of100mW/cm 2of irradiance at the location of the specimen. 2.2 Launch optics The launch optics are the means for coupling the light source to the light chamber. It may involv
24、e an imaging or light scattering system and may, in the case of phase-locked light detection, incorporate a light chopper. Specific information shall be provided in the detail specification. 2.3 Light chamber The intent of the light chamber is to permit, as much as possible, omnidirectional illumina
25、tion of the specimen by the external light source. In the case of small components, the ideal chamber here is an integrating sphere. Here “small” means that the dimensions of the specimen are equal to or smaller than20% of the diameter of the sphere. As an alternative, the specimen could be illumina
26、ted from a single direction and the test procedure modified to measure the specimen several times with different orientations in relation to the direction of illumination. 2.4 Optical power meter The optical configuration of the detector of the power meter shall be such as to detect all of the light
27、 emitted from a fibre end of the specimen. Since low levels of coupled ambient power are expected, the power meter shall be capable of detecting light levels of 90dBm in the wavelength range of the specimen or as specified in the detail specification. Figure 1 Apparatus and test arrangementEN61300-3
28、-8:1997 4 BSI 04-2000 2.5 Light tight chamber (optional) Normally, for this measurement, control of room lighting conditions should be exercised. Light shielding of fibre that is not intentionally illuminated and of the power meter optics may be required. 2.6 Irradiance meter The irradiance meter sh
29、all have enough range to measure100mW/cm 2 , or the intensity that the detail specification requires to be at the surface of the specimen. The reproducibility shall be within5%. The spectral response of the detector shall be compatible with the light source used. In the case of an integrating sphere
30、, the irradiance detector head is fitted as shown inFigure 1. In the case of unidirectional illumination of the specimen, the irradiance detector head shall be placed in close proximity to the specimen and oriented to detect the illuminating light. 2.7 Light tight caps Where ports of the specimen ex
31、ist either inside or outside of the light chamber, they shall be capped with seals capable of blocking light to a level specified in the detail specification. 3 Procedure 3.1 Prepare the specimen in accordance with the manufacturers instructions and place it in the light chamber as shown inFigure 1.
32、 Where possible, all pigtail ports of the specimen shall lead outside of the light chamber through light tight seals and be capped. The detail specification shall provide information on the placement of the specimen in the chamber and lengths and orientations of cable pigtails in the chamber. Normal
33、ly, the sample shall be placed in a manner which relieves tension and minimizes cable and fibre microbending as much as possible. 3.2 Connect a specified specimen port or pigtail to the optical power meter head in a manner which excludes stray light. 3.3 With the light source off, zero the optical p
34、ower meter and the irradiance meter reading (C). 3.4 Turn on the light source and adjust the light intensity to obtain the irradiance meter readings specified in the detail specification. For each value of irradiance P a (i), record the corresponding optical power meter reading, P t (i). 3.5 Plot P
35、t (i) vs P a (i) on a log-log chart as shown inFigure 2. In the linear region of the plot (corresponding to the “A-B” region shown inFigure 2), find the least squares fit to the measuring data. The ambient light susceptibility (ALS) is then defined as the slope of the curve. 3.6 Repeat the procedure
36、 with other ports of the specimen connected to the optical power meter, as specified in the detail specification. Figure 2 EN61300-3-8:1997 BSI 04-2000 5 4 Details to be specified The following details, as applicable, shall be specified in the detail specification: Light source type and spectral cha
37、racteristics Requirements for irradiance meter Detector requirements Light chamber description Performance requirements and additional pass/fail criteria Deviations from this measurement procedureBS EN 61300-3-8:1997 IEC 61300-3-8: 1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsIns
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