《BS-EN-61300-3-14-1997 IEC-61300-3-14-1995.pdf》由会员分享，可在线阅读，更多相关《BS-EN-61300-3-14-1997 IEC-61300-3-14-1995.pdf（12页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 61300-3-14:1997 IEC 61300-3-14: 1995 Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3.14: Examinations and measurements Accuracy and repeatability of the attenuation settings of a variable attenuator The European Standard
2、EN 61300-3-14:1997 has the status of a British Standard ICS 33.180.20 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:36:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61300-3-14:1997 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board,
3、 was published under the authority of the Standards Board and comes into effect on 15 November 1997 BSI 04-2000 ISBN 0 580 28530 8 National foreword This British Standard is the English language version of EN 61300-3-14:1997. It is identical with IEC 61300-3-14:1995. The UK participation in its prep
4、aration 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 enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpr
5、etation, 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 organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications
6、 have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. 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
7、CEN and CENELEC Standards normally include an annex which lists normative references to international 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
8、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 include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applicat
9、ion. 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 i and ii, the EN title page, pages 2 to 6, an inside back cover and a back cover. This standard has been updated (se
10、e 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.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:36:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
11、EN 61300-3-14:1997 BSI 04-2000i Contents Page National forewordInside front cover Foreword2 Text of EN 61300-3-143 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:36:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:36:08 GMT+0
12、0:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61300-3-14 August 1997 ICS 33.180.20 English version Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-14: Examinations and measurements Accuracy and repea
13、tability of the attenuation settings of a variable attenuator (IEC 61300-3-14:1995) Dispositifs dinterconnexion et composants passifs fibres optiques Mthodes fondamentales dessais et de mesures Partie 3-14: Examens et mesures Prcision et rptabilit des positions daffaiblissement dun attnuateur variab
14、le (CEI 61300-3-14:1995) Lichtwellenleiter Verbindungselemente und passive Bauteile Grundlegende Prf- und Meverfahren Teil 3-14: Untersuchungen und Messungen Genauigkeit und Reproduzierbarkeit der Einstellung eines variablen Dmpfungsgliedes (IEC 61300-3-14:1995) This European Standard was approved b
15、y 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 national standard without any alteration. Up-to-date lists and bibliographical references concerning such national s
16、tandards 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 in any other language made by translation under the responsibility of a CENELEC member into its own language and
17、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, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerlan
18、d and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen 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 a
19、ny means reserved worldwide for CENELEC members. Ref. No. EN 61300-3-14:1997 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:36:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61300-3-14:1997 BSI 04-2000 2 Foreword The text of the International Standard IEC 61300-3-14:1995, prepared by
20、SC 86B, 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 61300-3-14 on 1997-07-01 without any modification. The following dates were fixed: Endorsement notice The text of the International Stand
21、ard IEC 61300-3-14:1995 was approved by CENELEC as a European Standard without any modification. Contents Page Foreword2 1General3 1.1Scope and object3 1.2General description3 2Apparatus4 3Procedure5 4Details to be specified6 Annex A (informative) Sample test recordInside back cover Figure 1a Measur
22、ed versus nominal attenuation (absolute calibration of attenuation)3 Figure 1b Measured versus nominal attenuation (calibration relative to zero-point setting)4 Figure 2a5 Figure 2b5 Figure 3a5 Figure 3b5 Figure 3c5 latest date by which the EN has to be implemented at national level by publication o
23、f an identical national standard or by endorsement (dop) 1998-06-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 1998-06-01 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:36:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61300-3-14:1997 B
24、SI 04-20003 1 General 1.1 Scope and object The object of this part of IEC 1300 is to measure the accuracy and repeatability of the attenuation value settings of a variable attenuator. 1.2 General description A variable attenuator is adjusted sequentially through a series of attenuation settings pres
25、cribed in the detail specification. The attenuation value is measured at each setting. This sequence of measurements is repeated a number of times as prescribed in the detail specification. The accuracy of the attenuator at each setting is then given by the difference between the mean of the measure
26、d values and the nominal value. The repeatability at each setting is given by plus or minus three times the standard deviation of the measurements. This is illustrated in the following figures. Figure 1a shows an attenuator which is calibrated to read the actual or measured attenuation. Figure 1b sh
27、ows an attenuator which is calibrated relative to a zero-point attenuation setting. When the attenuator is adjusted to read zero, the actual or measured attenuation will be some value greater than zero. Figure 1a Measured versus nominal attenuation (absolute calibration of attenuation) Licensed Copy
28、: sheffieldun sheffieldun, na, Sat Nov 11 12:36:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61300-3-14:1997 4 BSI 04-2000 2 Apparatus The apparatus shall consist of the following elements. 2.1 Optical source (S) The source shall be sufficiently stable over the time required to perform the measu
29、rements. The performance of a variable attenuator will be influenced by the spectral characteristics of the source, and therefore the optical wavelength and bandwidth requirements shall be specified in the detail specification. The coherence and polarization characteristics may also influence perfor
30、mance and shall be specified, if applicable. 2.2 Excitation unit (E) This is a special launch fibre or imaging system designed to achieve the specified launch conditions. 2.3 Optical detector (D) Any detector non-linearity contributes directly to measurement error. Therefore, it is important that th
31、e detector and associated amplification circuits exhibit sufficiently good linearity over all measurement ranges. The amplifier usually contributes the most to non-linearity, particularly when the transimpedance is changed as the ranges are switched. Precaution should be taken to ensure that the pow
32、er density at the detector is always at least 10 dB below the saturation level of the detector. 2.4 Temporary joint (TJ) The insertion loss of the temporary joint shall be sufficiently stable over the time required to perform the measurements. A fusion splice is recommended. 2.5 Reference fibre (RF)
33、 A reference fibre or two reference connector pigtails (RA and RB), as specified in the detail specification. Figure 1b Measured versus nominal attenuation (calibration relative to zero-point setting) Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:36:08 GMT+00:00 2006, Uncontrolled Copy,
34、(c) BSI EN 61300-3-14:1997 BSI 04-20005 3 Procedure 3.1 The specimen shall be preconditioned as specified in the detail specification. 3.2 Assemble the measurement set-up as shown in Figure 2a for unconnectorized attenuators with attached pigtails, or Figure 2b for attenuators with attached connecto
35、rs or connector pigtails. Measure and record power level Po. 3.3 Insert the device to be measured (DUT) into the measurement set-up as shown in Figure 3a, Figure 3b or Figure 3c as applicable. Figure 2a Figure 2b Figure 3a Figure 3b Figure 3c Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12
36、:36:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61300-3-14:1997 6 BSI 04-2000 3.4 Adjust the DUT to the lowest attenuation setting and record power level P1. 3.5 Adjust the DUT to the next lowest attenuation setting and record power level P2. 3.6 If more than two settings are required to be mea
37、sured, continue adjusting the DUT to each progressively higher attenuation setting, measuring P3, P4, ., Pn. 3.7 Repeat steps 3.3 through 3.5 and record a second set of readings P1(2) to Pn(2). 3.8 Repeat step 3.6 for the number of times specified in the detail specification. 3.9 If the manufacturer
38、 provides absolute calibration of the attenuation settings (see Figure 1a), the accuracy of the “ith” attenuation setting is given by: If the manufacturer provides calibration relative to the zero-point setting (see Figure 1b), the above formula is modified to: 3.10 The repeatability of the “ith” at
39、tenuation setting is given by: %ai = 3i(dB) where i is the standard deviation of the measurements. A minimum of m = 20 measurements at each setting is recommended to provide a reasonable estimate of i. NOTEIt is permissible to measure the attenuation settings in the reverse direction to what is desc
40、ribed in this procedure, i.e., from the highest to lowest values. To avoid mechanical backlash which may reduce the precision of the measurements, the adjustment to each attenuation value should be made in the direction of increasing attenuation except for the lowest setting. 4 Details to be specifi
41、ed The following details, as applicable, shall be specified in the detail specification: Source (S) Temporary joint (TJ) Launch conditions Detector (D) Reference fibre (RF) Reference connector set (RA and RB) Fibre lengths (L1, L2) Preconditioning procedure Attenuation settings measured Number of me
42、asurements at each setting (m) Device performance specifications versus actual performance Deviations from this measuring procedure (dB) where $aiai Ai= $aiai ai Ai= Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:36:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61300-3-14:1997 BSI 04-2
43、000 Annex A (informative) Sample test record The following example is for illustration only and does not indicate recommended apparatus or measuring conditions. Source description: 1307 nm laser, Hewlett-Packard # 81553SM + 8153A. Excitation unit description: None. Detector description: InGaAs power
44、 sensor, Hewlett-Packard # 81532A + 8153A. Reference fibre: Cut-back section of attenuator input port. Reference connector set: None. Temporary joint: Fusion splice. Fibre lengths: L1 = 0,25 m; L2 = 1 m Preconditioning procedure: Standard atmospheric conditions for 24 h as per IEC 1300-11). Attenuat
45、ion settings to be measured: Minimum setting, 10 dB, 20 dB, 30 dB, 40 dB, 50 dB and 60 dB. Number of measurements at each setting: m = 20. Deviations from this test procedure: Po measured by cut-back of attenuator input port. Device performance specifications versus actual performance: see table bel
46、ow. 1) IEC 1300-1:1995, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 1: General and guidance. SettingNominal valuesMeasured values (i) AttenuationAccuracyRepeatabilityAttenuationAccuracyRepeatability Aiaiaiaiaiai dBdB dBdBdB dB 11,4 0,5 0,31,7
47、+ 0,30,11 210 0,5 0,39,8 0,20,16 320 0,5 0,419,7 0,30,23 430 0,5 0,430,00,00,30 540 0,5 0,540,3+ 0,30,33 650 0,5 0,550,4+ 0,40,39 760 0,5 0,660,4+ 0,40,41 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:36:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61300-3-14:1997 IEC 61300-3-14:
48、1995 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Stan
49、dards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 02