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1、BRITISH STANDARD BS 9125:1988 Incorporating Amendment No. 1 Specification for Capability approval of manufacturers of passive radio interference suppression filter units of assessed quality generic data UDC 621.37/.39:658.562.64:621.371.542 Licensed Copy: London South Bank University, London South B
2、ank University, Fri Dec 08 04:27:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9125:1988 This British Standard, having been prepared under the direction of the Electronic Components Standards Committee, was published under the authority of the Board of BSI and comes into effect on 29 April 1988 B
3、SI 01-2000 The following BSI references relate to the work on this standard: Committee reference ECL/4 Draft for comment 85/22298 DC ISBN 0 580 16572 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Components Standards Commi
4、ttee (ECL/-) to Technical Committee ECL/4, upon which the following bodies were represented: British Telecommunications plc Electronic Components Industry Federation Electronic Engineering Association Ministry of Defence National Supervising Inspectorate Society of British Aerospace Companies Ltd. T
5、elecommunication Engineering and Manufacturing Association (TEMA) The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Business Equipment and Information Technology Association Department of Trade and Industry (Radiocommunications Division) El
6、ectrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Home Office Amendments issued since publication Amd. No.Date of issueComments 7510February 1993Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 04:27:12 G
7、MT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9125:1988 BSI 01-2000i Contents Page Committees responsibleInside front cover Forewordiii Section 1. Principles and mandatory procedures 1.1General matters1 1.1.1Scope1 1.1.2Related documents1 1.1.3Terminology1 1.1.4Letter symbols, signs and abbreviations
8、1 1.1.5Graphical symbols1 1.1.6Subcontracting1 1.1.7Incorporation of added components1 1.1.8Re-verification period for maintenance of capability approval1 1.1.9Rework and repair work1 1.2Test procedures2 1.2.1Test methods2 1.2.2Test and measurement conditions2 1.2.3Visual inspection2 1.2.4Dimensions
9、 and gauging2 1.2.5Electrical test procedures2 Section 2. Procedures for capability approval 2.1General requirements3 2.2Procedure3 2.3Capability qualifying components3 2.4Boundaries3 2.5Additional boundaries4 2.6CQC specifications5 2.7Demonstration of capability5 2.8Capability approval test report5
10、 2.9Abstract of description of capability5 2.10Test schedules for capability approval5 2.10.1Schedule CA15 2.10.2Schedule CA25 2.10.3Schedule CA35 2.10.4Schedule CA45 Section 3. Procedures for the maintenance of capability approval 3.1General10 Section 4. Changes, suspension, restriction or withdraw
11、al of capability approval 4.1General11 Section 5. Quality conformance inspection 5.1General12 5.2Custom-built filter units12 5.3Standard catalogue items12 5.4Delayed delivery12 5.5Release for delivery12 Section 6. Screening requirements 6.1General13 Licensed Copy: London South Bank University, Londo
12、n South Bank University, Fri Dec 08 04:27:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9125:1988 ii BSI 01-2000 Page Section 7. Statutory safety requirements 7.1General14 Section 8. General rules for the preparation of customer detail specifications 8.1Basic information15 8.2Originator of the cu
13、stomer detail specification15 8.3Numbering of the detail specification15 8.4Description of the component and intended application15 8.5Outline drawing and dimensions15 8.6Ratings and characteristics15 8.7Related documents16 8.8Additional information (not for inspection purposes)16 8.9Ordering instru
14、ctions16 8.10Inspection requirements to be listed in the detail specification16 Appendix A Layout of an abstract of description of capability for inclusion in PD 900217 Appendix B Front page layout of a customer detail specification18 Figure 1 Curve A4 Figure 2 Curve B4 Table 1 Schedule CA16 Table 2
15、 Schedule CA27 Table 3 Schedule CA38 Table 4 Schedule CA49 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 04:27:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9125:1988 BSI 01-2000iii Foreword This British Standard has been prepared under the direction of the
16、 Electronic Components Standards Committee. It implements the changes included in the revision of BS 9121. It specifies the general procedures to be followed for the capability approval of manufacturers wishing to release filter units under provisions of clause 15 of BS 9000-1:1981, and BS 9005. Cap
17、ability approval covers the design, materials, processing, inspection and testing for the release of electronic components manufactured within a stated component technology. Under capability approval, filter units are released to either customer detail specifications, see 15.10 of BS 9000-1:1981, or
18、 detail specifications for standard catalogue items, see 15.11 of BS 9000-1:1981. In both cases the quality of manufacture is determined by regular assessment under the programme of maintenance of capability approval, and the function of the particular filter units. Additional testing and/or quality
19、 assessment procedures may be invoked by the detail specification. A British Standard does not purport to include 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 immunit
20、y from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 18 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 i
21、nside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 04:27:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 04:27:12 GMT+00:00 2006, Uncontrolled Copy, (c)
22、BSI BS 9125:1988 BSI 01-20001 Section 1. Principles and mandatory procedures 1.1 General matters 1.1.1 Scope This British Standard specifies requirements for the approvals granted to manufacturers to release passive radio interference suppression filter units under the terms for capability approval
23、given in BS 9000-1:1981. The requirements of BS 9005:1985 are invoked as additionally applicable to approvals governed by this standard. 1.1.2 Related documents BS 2011, Basic environmental testing procedures. BS 3939, Guide for graphical symbols for electrical power, telecommunication and electroni
24、cs diagrams. BS 4727, Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms. BS 5775, Specification for quantities, units and symbols. BS 6001, Sampling procedures for inspection by attributes. BS 6299, Methods of measurement of the suppression characteristic
25、s of passive radio interference filters and suppression components. BS 9000, General requirements for a system for electronic components of assessed quality. BS 9005, Specification for general procedures to be followed for the capability approval of electronic components covered by BS 9000-1. BS 912
26、0, Specification for radio interference suppression filters of assessed quality: Generic data and methods of test. BS 9121, Blank detail specification for radio interference suppression filters of assessed quality. Basic assessment level. PD 9002, BS 9000, BS CECC and IECQ qualified products list. F
27、urther documents which may be required are listed in BS 9120. 1.1.3 Terminology For the purposes of this British Standard the general electrical and telecommunication terms and definitions given in the appropriate Part of BS 4727 and 1.1.3 of BS 9120:1988 apply. In addition the following specific te
28、rm and definition is applicable to components covered by this standard. passive radio interference suppression filter unit an essentially low-pass through line filter employing inductance capacitance and resistance to attenuate the transmission of radio frequency interference NOTEThis may therefore
29、include the lead through type of suppression capacitor. 1.1.4 Letter symbols, signs and abbreviations The letter symbols, signs and abbreviations employed in documents produced for the purposes of this standard shall comply with BS 5775 or be derived in accordance with the principles of BS 5775. Suc
30、h additional letter symbols etc. as may be required shall be defined. 1.1.5 Graphical symbols The graphical symbols employed in documents produced for the purposes of this standard shall comply with BS 3939 or be derived in accordance with the principles of BS 3939. Such additional graphical symbols
31、 as may be required shall be defined. 1.1.6 Subcontracting Subcontracting is permitted in accordance with clause 3 of BS 9005:1985. However, the assembly of the piece parts and the inductive, capacitive and resistive elements of the filter shall not be subcontracted. Where the formation of the capac
32、itive, inductive or resistive elements is an integral part of the assembly, the processes by which these elements are formed shall not be subcontracted. 1.1.7 Incorporation of added components The procedures concerning the incorporation of added electronic components, be they approved or unapproved,
33、 finished or part finished shall be conducted in accordance with clause 4 of BS 9005:1985; see also clause 6 of BS 9005:1985. 1.1.8 Re-verification period for maintenance of capability approval Capability approval is maintained, provided that all boundaries of the approval have been assessed to the
34、satisfaction of the NSI, within a period not exceeding 3 years. 1.1.9 Rework and repair work 1.1.9.1 Rework Rework is the rectification of processing errors and shall not be carried out if specifically prohibited by the relevant specification. The detail specification shall state if there is a restr
35、iction on the number of occasions that rework may take place on a specific component. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 04:27:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9125:1988 2 BSI 01-2000 All rework shall be carried out prior to the form
36、ation of the inspection lot offered for inspection to the requirements of the detail specification. Such rework procedures shall be fully described in the relevant documentation produced by the manufacturer, and shall be carried out under the direct control of the Chief Inspector. Subcontracting of
37、rework is not permitted. 1.1.9.2 Repair work Repair work is the correction of defects in a component after release to the customer. The procedures for repair shall be described in the relevant documentation produced by the manufacturer. Components that have been repaired can no longer be considered
38、as representative of the manufacturers production, and may not be released under the BS 9000 system. When returning repaired components to the customer, reference shall be made to the original release certificate number and the following statement shall be issued by the approved Chief Inspector: “Th
39、e components contained herein have been repaired using processes and procedures covered by BSI Approval No. . .”. NOTERework should not be confused with repair. Repaired material is not eligible for BS 9000 release. 1.2 Test procedures 1.2.1 Test methods For the purposes of this generic specificatio
40、n, 1.2 and the associated appendices of BS 9120:1988 shall apply. 1.2.2 Test and measurement conditions 1.2.2.1 General All tests shall be carried out within the range of standard atmospheric conditions for testing specified in BS 2011-1.1:1983. If necessary for reference or referee purposes the fur
41、ther conditions associated with 20 C shall apply, and measurements shall be carried out under conditions of thermal stability. 1.2.2.2 Measurement uncertainty The limits given in detail specifications and this standard shall be absolute. The measurement uncertainty applying to the measurement system
42、 employed shall be taken into account when the measurements are assessed against the specification limits. Where tolerances in respect of set conditions or instrument error have been specified, these shall be regarded as minimum requirements additional to the foregoing. 1.2.2.3 Alternative test meth
43、ods The test and measurement methods given in the relevant specification shall not be regarded as the only methods to be used. However, the manufacturer shall satisfy the National Supervising Inspectorate (NSI) that any alternative methods to be used shall give results equivalent1) to those obtained
44、 by the methods specified. Alternative test methods shall not be shown in detail specifications. 1.2.3 Visual inspection Visual inspection shall be performed under normal factory lighting conditions without visual aids. The condition, workmanship and finish shall be satisfactory. Particular attribut
45、es to be verified by examination shall be fully described in the relevant detail specification. 1.2.4 Dimensions and gauging For the verification of capability qualifying components (CQCs) all drawn and toleranced dimensions applicable to the filter unit, its piece parts and the outline dimensions o
46、f included components shall be measured. For the assessment of filter units to be released, all toleranced dimensions shall be verified as complying with the relevant detail specification. For mains filter units the creepage distances and clearances between line parts and metal case shall not be les
47、s than the values given in Table 4 of BS 9120:1988. 1.2.5 Electrical test procedures 1.2.5.1 Voltage proof The test method in Appendix B of BS 9120:1988 shall be employed. 1.2.5.2 Electrical continuity The d.c. resistance existing between all terminals which, by reference to the filter unit circuit
48、diagrams, are shown as providing mutual d.c. electrical continuity, shall be verified as being less than 1 7 or as is specified in the relevant detail specification. The test voltage applied for the purpose of this verification shall be less than 10 V unless other voltage or current limitations are
49、specified in the relevant detail specification. In the case of filter units fitted with cords or connectors, this test shall include the verification of the correctness of identification of terminations in accordance with 1.1.6.3 of BS 9120:1988. 1.2.5.3 Insulation resistance The test method shown in 1.2.5.3 of BS 9120:1988 shall be employed. 1) By “equivalent” it is meant that the value of characteristic established by such an alternative method, and acceptable in accordance with the limits described to that method, will fall within the specified limits when measure
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