1、BRITISH STANDARD BS 9741:1986 Sectional specification for inductors of assessed quality for use in electronic equipment for capability approval UDC 621.318.43BS9741:1986 This British Standard, having been prepared under the directionof the Electronic Components Standards Committee, was published und
2、erthe authority of the Board ofBSI 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 responsibl
3、e for this BritishStandard 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 Use
4、rs 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 issue CommentsBS9741:1986 BSI 01-2000 i Contents Page Committees respon
5、sible Inside front cover Foreword ii 1 Scope 1 2 Related documents 1 3 Preparation of the detail specification 1 4 Inspection requirements to be listed in the detail specification 2 5 Detail specification 2BS9741:1986 ii BSI 01-2000 Foreword This revised British Standard has been prepared under the
6、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 BS9000/BS9720 capability approval procedure. In this edition the format of the blank detail specification has been simplifi
7、ed 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 BS9720 are also incorporated where appropriate. As an a
8、ssessment level for the document is now inappropriate, this standard supersedes both BS9741:1978 and BS9742:1978, which are withdrawn.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
9、 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 includ
10、e 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
11、 and ii, pages1 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.BS9741:1986 BSI 01-2000 1 1 Scope This British Standard specifies inspection requirements and t
12、ests from which a selection is made when preparing a detail specification for inductors to be released under the terms of BS9720 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 com
13、ponent; 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 BS9751. 2 Rel
14、ated 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:
15、 generic data and methods of test. PD 9002, BS 9000, BS CECC and IECQ qualified products list. NOTEBS6001 and BS9720 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 wi
16、th 2.6.1 of BS9720:1983. NOTE 1The detail specification takes the form of the BDS shown in clause5, 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 BS9720. Those sho
17、wn 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 test
18、s 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
19、requirements 3.2.1 Where additional tests of a type not defined or invoked in BS9720 are required, these shall be fully specified in the detail specification. NOTEIf possible this should be by reference to another BritishStandard such as, for example, BS9750 “Specification for fixed r.f. inductors o
20、f 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
21、 the level of sampling required and, where indicated see4.1 b), in the order of testing required. Where100% testing is not required, inspection levels and acceptable quality levels shall be selected from BS6001. 3.2.4 The completed detail specification shall be allocated a component identity number
22、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
23、manufacturer wishes to be listed in PD9002, BSI will allocate an appropriate number in accordance with 15.11 of BS9000-1:1981. 3.2.5 Additionally the detail specification shall include a number allocated by the component manufacturer comprising this specification number, his factory identification c
24、ode letters and a unique number within his registration system, e.g.BS9741/XYZ/1234. NOTEAfter a detail specification has been allocated the manufacturers reference number in accordance with3.2.5, it is to be considered a contractual part of an order. Copies of all such detail specifications are to
25、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 sh
26、all not exceed the scope of the manufacturers capability approval (seealso 1.1.12 of BS9720:1983). 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 specificat
27、ion 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
28、and giving termination identification.BS9741:1986 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 BS6001, normal
29、inspection. b) Tests in a group may be carried out in any order except where otherwise indicated (see3.2.3). c) Components submitted to any tests marked (D) may not be released under BS9720 capability approval (D = destructive). d) The values given for measurement limits are absolute values: measure
30、ment 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
31、 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
32、required. 5 Detail specification The BDS which follows, when completed in accordance with clause3, 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 ch
33、anges will be necessary, but the basic format should be retained.BS9741:1986 BSI 01-2000 3 Blank detail specification Sheet 1 (of 7) Originators component identity number Specification available from: SPECIFICATION ISSUESTATUS DATE ELECTRONIC COMPONENTS OF ASSESSED QUALITY MANUFACTURERS REFERENCE NU
34、MBERS SEE NOTES 1 AND 2 BELOW a 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 BS9720 Capability Approval Cert
35、ificate (listed in PD9002) 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 c
36、opy of this document issued by a potential customer is at the customers discretion.BS9741:1986 4 BSI 01-2000 Blank detail specification Sheet 2 (of 7) Originators component identity number Inductor to BS 9741:1986 ISSUE STATUS Ratings and characteristics (see3.3 of BS 9741:1986) DATE Climatic catego
37、ry Maximum temperature range Mass Vibration (see BS2011-2.1Fc) 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
38、of winding 1 2 3 Polarizing direct current Inductance No-load current Q factorBS9741:1986 BSI 01-2000 5 Blank detail specification Sheet 3 (of 7) Originators component identity number Inductor to BS 9741:1986 ISSUE STATUS Inspection requirements (see notes) DATE TEST IL AQL BS 9720:1983 Reference Pe
39、rformance requirements and conditions of test DESIGN VERIFICATION ONLY:2 specimens, no failures (see4.2 of BS9741:1986) Design verification inspection comprises those tests listed below plus all those selected for conformance inspection. Design verification tests shall only be performed when specifi
40、cally invoked by the relevant order. As required As required As required As required As required As required IN PROCESS INSPECTION: To be conducted during manufacture if an isolating screen is specified Isolating screen 100% 1.2.4.8.2 1.2.2.2 Isolating screen position S4 1% 1.2.2.1BS9741:1986 6 BSI
41、01-2000 Blank detail specification Sheet 4 (of 7) Originators component identity number Inductor to BS 9741:1986 ISSUE STATUS Inspection requirements (see notes) DATE TEST IL AQL BS 9720:1983 Reference Performance requirements and conditions of test TESTS ON COMPLETED COMPONENTS Visual inspection 10
42、0% 1.2.2 Dimensions 100% 1.2.3 Continuity 1.2.4.1.2 or 100% The required test shall be specified in the detail specification D.C. winding resistance 1.2.4.1.1 Voltage proof 100% 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
43、factor 100% 1.2.4.9 No-load current 100% 1.2.4.3.1 Isolating screens 100% A test is made to confirm the effectiveness of isolating screens using the method for electrostatic screens (see1.2.4.8.1 of BS 9720:1983)BS9741:1986 BSI 01-2000 7 Blank detail specification Sheet 5 (of 7) Originators componen
44、t identity number Inductor to BS 9741:1986 ISSUE STATUS Inspection requirements (see notes) DATE TEST IL AQL BS 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 Pha
45、se test 100% 1.2.4.26 Acoustic noise 100% 1.2.4.25 Insulation resistance (standard atmosphere) S4 1% 1.2.4.2.1 Self-capacitance S4 1% 1.2.4.15.1 Self-resonance S4 1% 1.2.4.17.1 Resistance unbalance S4 1% 1.2.4.13 Magnetic radiation S4 1% 1.2.4.24 Magnetic shielding S4 1% 1.2.4.6.1 Electrostatic scre
46、ens S4 1% 1.2.4.8.1BS9741:1986 8 BSI 01-2000 Blank detail specification Sheet 6 (of 7) Originators component identity number Inductor to BS 9741:1986 ISSUE STATUS Inspection requirements (see notes) DATE TEST IL AQL BS 9720:1983 Reference Performance requirements and conditions of test TESTS ON COMP
47、LETED COMPONENTS (continued) Insulation resistance (hot) S3 1.5% 1.2.4.2.2 Induced highvoltage S3 1.5% 1.2.4.5 Temperature rise S2 2.5% 1.2.4.22 Insert additional tests as required: NOTE 1Sampling inspection is to be carried out in accordance with BS6001, normal inspection. NOTE 2Tests in a group ma
48、y be carried out in any order except where otherwise indicated (see3.2.3 of BS9741:1985). NOTE 3Components submitted to any tests marked (D) may not be released under BS9720 capability approval. NOTE 4The values given for measurement limits are absolute values: measurement uncertainty is to be taken
49、 into account.BS9741:1986 BSI 01-2000 9 Blank detail specification Sheet 7 (of 7) Originators component identity number Inductor to BS 9741:1986 ISSUE STATUS OUTLINE DRAWING SCHEMATIC DATE Drawing in accordance with BS 308 Dimensions in mm Third angle projection Drawing (see 3.4.1 of BS 9741:1986): Marking: component identity no. including specification issue status; factory identity code as a minimum; position to be indicated (see also 1.1.6 of BS 9720:1983) Schematic diagram (see 3.4.2 of BS 9741:1986): BS 9741:1986 BSI 389 Chiswick High Ro
