BS-9741-1986.pdf

BRITISH STANDARD BS 9741:1986 Sectional specification for inductors of assessed quality for use in electronic equipment for capability approval UDC 621.318.43 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9741:1986 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 30 April 1986 © BSI 01-2000 First published May 1978 First revision April 1986 The following BSI references relate to the work on this standard: Committee reference ECL/18 Draft for comment 85/24630 DC ISBN 0 580 15111 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Components Standards Committee (ECL/-) to Technical Committee ECL/18 upon which the following bodies were represented: Electronic Components Industry Federation Engineering Equipment and Materials Users Association Ministry of Defence National Supervising Inspectorate Telecommunications Engineering and Manufacturing Association (TEMA) United Kingdom Atomic Energy Authority Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9741:1986 © BSI 01-2000i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Related documents1 3Preparation of the detail specification1 4Inspection requirements to be listed in the detail specification2 5Detail specification2 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9741:1986 ii © BSI 01-2000 Foreword This revised British Standard has been prepared under the direction of the Electronic Components Standards Committee. It is intended to be used for the preparation of detail specifications for inductors released under the terms of the BS 9000/BS 9720 capability approval procedure. In this edition the format of the blank detail specification has been simplified and the recommended test schedule modified, to accord with the experience gained in operating the procedure since the first edition, and clear guidance is given on the suitable test inspection levels. Changes brought about by the revision of BS 9720 are also incorporated where appropriate. As an assessment level for the document is now inappropriate, this standard supersedes both BS 9741:1978 and BS 9742:1978, which are withdrawn. It is intended for use by the following originators. a) A customer wishing to procure signal transformers that are within the scope of the approved capability of his supplying component manufacturer, e.g. for customers detail specifications (CDSs). b) A capability approved manufacturer of signal transformers wishing to prepare specifications for his own products which are within the scope of his capability approval. 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 immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 9 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. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9741:1986 © BSI 01-20001 1 Scope This British Standard specifies inspection requirements and tests from which a selection is made when preparing a detail specification for inductors to be released under the terms of BS 9720 capability approval. It includes a blank detail specification (BDS), which shows the format, and indicates which tests are considered to be appropriate to this type of component; although the final selection of tests to be included in the inspection schedule is at the discretion of the specification writer. It also lists appropriate ratings and characteristics. NOTEQualification approved small fixed r.f. inductors may also be procured in accordance with BS 9751. 2 Related documents BS 2011, Basic environmental testing procedures. BS 6001, Sampling procedures for inspection by attributes. BS 9000, General requirements for a system for electronic components of assessed quality. BS 9720, Specification for custom-built transformers and inductors of assessed quality: generic data and methods of test. PD 9002, BS 9000, BS CECC and IECQ qualified products list. NOTEBS 6001 and BS 9720 should be available for reference when preparing detail specifications. 3 Preparation of the detail specification 3.1 General A detail specification shall be prepared in accordance with 2.6.1 of BS 9720:1983. NOTE 1The detail specification takes the form of the BDS shown in clause 5, particularly in respect of the front page format and, in principle, in respect of the presentation of the inspection requirements. NOTE 2All the tests shown in the BDS are taken from BS 9720. Those shown in bold type concern operating characteristics of fundamental importance and it is strongly recommended that these are selected by the specification writer for inclusion in the detail specification. The tests shown in plain type are listed for the convenience of the specification writer, and tests should be selected from them according to the particular application of the component. NOTE 3Over-specification may carry an economic penalty. However, the specification writer may specify tests and sampling levels different from, less than, or additional to those given in the BDS. 3.2 Particular requirements 3.2.1 Where additional tests of a type not defined or invoked in BS 9720 are required, these shall be fully specified in the detail specification. NOTEIf possible this should be by reference to another British Standard such as, for example, BS 9750 “Specification for fixed r.f. inductors of assessed quality: generic data and methods of test”. 3.2.2 Any tests considered as being destructive shall be so denoted in the test schedule by the addition of the notation “(D)”. NOTEThe use of this notation is not illustrated in the BDS. 3.2.3 Tests shall be grouped in the schedule according to the level of sampling required and, where indicated see 4.1 b), in the order of testing required. Where 100 % testing is not required, inspection levels and acceptable quality levels shall be selected from BS 6001. 3.2.4 The completed detail specification shall be allocated a component identity number and issue status by the originator. NOTE 1This number is chosen by the originator (manufacturer or customer) within his own system. It is thus not subject to any external rules or codification. NOTE 2In the special case of a manufacturers detail specification for a standard catalogue item which the manufacturer wishes to be listed in PD 9002, BSI will allocate an appropriate number in accordance with 15.11 of BS 9000-1:1981. 3.2.5 Additionally the detail specification shall include a number allocated by the component manufacturer comprising this specification number, his factory identification code letters and a unique number within his registration system, e.g. BS 9741/XYZ/1234. NOTEAfter a detail specification has been allocated the manufacturers reference number in accordance with 3.2.5, it is to be considered a contractual part of an order. Copies of all such detail specifications are to be retained by the manufacturers chief inspector. 3.3 Ratings and characteristics 3.3.1 Ratings. In the case of customer originated detail specifications customer and manufacturer agreement shall be obtained on the ratings to be ascribed to the component in the detail specification. These ratings shall not exceed the scope of the manufacturers capability approval (see also 1.1.12 of BS 9720:1983). 3.3.2 Characteristics. A customer shall prescribe in the detail specification any characteristic required for a component. 3.4 Outline drawings and winding schematic diagram 3.4.1 The detail specification shall incorporate a drawing of the inductor showing important features, such as those dimensions affecting interchangeability, restrictions on mounting and marking requirements. 3.4.2 The detail specification shall incorporate a schematic diagram showing all windings, screens, taps and phasings and giving termination identification. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9741:1986 2 © BSI 01-2000 4 Inspection requirements to be listed in the detail specification 4.1 Conformance inspection The detail specification shall incorporate the following notes. a) Sampling inspection is to be carried out in accordance with BS 6001, normal inspection. b) Tests in a group may be carried out in any order except where otherwise indicated (see 3.2.3). c) Components submitted to any tests marked (D) may not be released under BS 9720 capability approval (D = destructive). d) The values given for measurement limits are absolute values: measurement uncertainty is to be taken into account. 4.2 Design verification The tests to be detailed under this heading are those which the specification writer considers to be inappropriate to lot-by-lot release, but appropriate to the verification of new and original designs. Accordingly, they are to be performed only when specially so stated in the order, and the detail specification shall carry a statement to this effect. If design verification is required, the number of specimens and that there shall be no failures shall be stated in the detail specification. NOTETwo specimens will normally be required. 5 Detail specification The BDS which follows, when completed in accordance with clause 3, forms the relevant detail specification. NOTEThe front page of the BDS has been based upon the need for a customers detail specification. Where a manufacturers detail specification is required, some changes will be necessary, but the basic format should be retained. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9741:1986 © BSI 01-20003 Blank detail specificationSheet 1 (of 7) Originators component identity number Specification available from:SPECIFICATION ISSUE STATUS DATE ELECTRONIC COMPONENTS OF ASSESSED QUALITY MANUFACTURERS REFERENCE NUMBERS SEE NOTES 1 AND 2 BELOWa DETAIL SPECIFICATION IN ACCORDANCE WITH BS 9741:1986 INDUCTOR BRIEF TECHNICAL DESCRIPTION For detail dimensions and schematic diagram see sheet 7 NOTE 1It may be possible to procure this component from any manufacturer holding a current BS 9720 Capability Approval Certificate (listed in PD 9002) for such wound components defined herein, i.e. where this component falls within the manufacturers approved limits. NOTE 2Current Approved Manufacturers are:a Manufacturer Capability Approval No.Manufacturers Ref. No. BS 9741/XYZ/1234 a The listing of manufacturers in a copy of this document issued by a potential customer is at the customers discretion. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9741:1986 4 © BSI 01-2000 Blank detail specificationSheet 2 (of 7) Originators component identity number Inductor to BS 9741:1986ISSUE STATUS Ratings and characteristics (see 3.3 of BS 9741:1986) DATE Climatic category Maximum temperature range Mass Vibration (see BS 2011-2.1Fc) Bump (see BS 2011-2.1Eb) Shock (see BS 2011-2.1Ea) Solderability (see BS 2011-2.1Ta) Robustness of terminations (see test Ua, Ub, Uc or Ud of BS 2011-2.1U as appropriate) Applied signal level Frequency range Peak working voltage Section of winding 123 Polarizing direct current Inductance No-load current Q factor Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9741:1986 © BSI 01-20005 Blank detail specificationSheet 3 (of 7) Originators component identity number Inductor to BS 9741:1986ISSUE STATUS Inspection requirements (see notes)DATE TESTILAQLBS 9720:1983 Reference Performance requirements and conditions of test DESIGN VERIFICATION ONLY: 2 specimens, no failures (see 4.2 of BS 9741:1986) Design verification inspection comprises those tests listed below plus all those selected for conformance inspection. Design verification tests shall only be performed when specifically invoked by the relevant order. As requiredAs required As requiredAs required As requiredAs required IN PROCESS INSPECTION: To be conducted during manufacture if an isolating screen is specified Isolating screen100 %1.2.4.8.2 1.2.2.2 Isolating screen position S41 %1.2.2.1 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9741:1986 6 © BSI 01-2000 Blank detail specificationSheet 4 (of 7) Originators component identity number Inductor to BS 9741:1986ISSUE STATUS Inspection requirements (see notes)DATE TEST ILAQLBS 9720:1983 Reference Performance requirements and conditions of test TESTS ON COMPLETED COMPONENTS Visual inspection 100 %1.2.2 Dimensions100 %1.2.3 Continuity1.2.4.1.2 or100 %The required test shall be specified in the detail specification D.C. winding resistance 1.2.4.1.1 Voltage proof100 %1.2.4.4 THE APPROPRIATE TEST(S) SHOULD BE SELECTED FROM THE FOLLOWING THREE Inductance and A.C. resistance 100 %1.2.4.7 Q factor100 %1.2.4.9 No-load current100 %1.2.4.3.1 Isolating screens100 %A test is made to confirm the effectiveness of isolating screens using the method for electrostatic screens (see 1.2.4.8.1 of BS 9720:1983) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9741:1986 © BSI 01-20007 Blank detail specificationSheet 5 (of 7) Originators component identity number Inductor to BS 9741:1986ISSUE STATUS Inspection requirements (see notes)DATE TEST ILAQLBS 9720:1983 Reference Performance requirements and conditions of test TESTS ON COMPLETED COMPONENTS (continued) Voltage unbalance 100 %1.2.4.12 Voltage transformation ratio 100 %1.2.4.16 Phase test100 %1.2.4.26 Acoustic noise100 %1.2.4.25 Insulation resistance (standard atmosphere) S41 %1.2.4.2.1 Self-capacitanceS41 %1.2.4.15.1 Self-resonanceS41 %1.2.4.17.1 Resistance unbalance S41 %1.2.4.13 Magnetic radiation S41 %1.2.4.24 Magnetic shielding S41 %1.2.4.6.1 Electrostatic screens S41 %1.2.4.8.1 Licensed Copy: London South Bank University, London South Bank