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1、BRITISH STANDARD BS 9733:1985 Sectional specification for pulse transformers of assessed quality for use in electronic equipment for capability approval UDC 621.314.2 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:37 GMT+00:00 2006, Uncontrolled Copy, (c)
2、 BSI BS 9733:1985 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 November 1985 BSI 01-2000 First published December 1978 First revision November 1985 T
3、he following BSI references relate to the work on this standard: Committee reference ECL/18 Draft for comment 84/29485 DC ISBN 0 580 14686 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Components Standards Committee (ECL/-
4、) to Technical Committee ECL/18, upon which the following bodies were represented: Beama Transmission and Distribution Association Electronic Components Industry Federation Electronic Engineering Association Engineering Equipment and Materials Users Association Ministry of Defence National Supervisi
5、ng Inspectorate Society of British Aerospace Companies Limited 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 U
6、niversity, Fri Dec 08 02:21:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9733:1985 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 specificatio
7、n2 5Detail specification2 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9733:1985 ii BSI 01-2000 Foreword This revised British Standard has been prepared under the direction of the Electronic Components St
8、andards Committee. It is intended to be used for the preparation of detail specifications for pulse transformers 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 sc
9、hedule 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 docum
10、ent is now inappropriate, this standard supersedes both BS 9733:1978 and BS 9734:1978, which are withdrawn. It is intended for use by the following originators. a) A customer wishing to procure pulse transformers that are within the scope of the approved capability of his supplying component manufac
11、turer, e.g. for customers detail specifications (CDSs). b) A capability approved manufacturer of pulse 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 provision
12、s 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 b
13、ack 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 02:21:37 GMT+00:00 2006, Uncontrolle
14、d Copy, (c) BSI BS 9733:1985 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 pulse transformers to be released under the terms of BS 9720 capability approval. It includes a blank detail sp
15、ecification (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 cha
16、racteristics. The components covered by this standard are essentially concerned with uni-directional pulses and the transfer of the energy and signals of these pulses from one section of a circuit to another. Whilst no specific dividing line is practicable, low power pulse transformers are regarded
17、as transferring information and high power pulse transformers are regarded as transferring power. 2 Related documents BS 2011, Basic environmental testing procedures. BS 6001, Sampling procedures and tables for inspection by attributes. BS 9000, General requirements for a system for electronic compo
18、nents 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 and BS CECC qualified products list. NOTEBS 6001 and BS 9720 should be available for reference when preparing detail specifications. 3
19、 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 pr
20、esentation 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
21、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 spec
22、ify 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. 3.2.2 Any tests considered
23、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 t
24、esting 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 origina
25、tor (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
26、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 9733
27、/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 charact
28、eristics 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 a
29、lso 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 transformer showing important f
30、eatures, such as those dimensions affecting interchangeability, restrictions on mounting and marking requirements. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9733:1985 2 BSI 01-2000 3.4.2 The detail spe
31、cification shall incorporate a schematic diagram showing all windings, screens, taps and phasings and giving termination identification. 4 Inspection requirements to be listed in the detail specification 4.1 Conformance inspection The detail specification shall incorporate the following notes. a) Sa
32、mpling 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 = destruct
33、ive). 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
34、 to the verification of new and original designs. Accordingly, they are to be performed only when specifically 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
35、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 deta
36、il 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 02:21:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9733:1985 BS
37、I 01-20003 Blank detail specificationSheet 1 (of 7) Originators component identity number Specification available from:SPECIFICATION ISSUE STATUS DATE ELECTRONIC COMPONENTS OF ASSESSED QUALITYMANUFACTURER(S) REFERENCE NUMBERS SEE NOTES 1 AND 2 BELOWa DETAIL SPECIFICATION IN ACCORDANCE WITH BS 9733:1
38、985 PULSE TRANSFORMER 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
39、.e. where this component falls within the manufacturer(s) approved limits. NOTE 2Current Approved Manufacturers are:a Manufacturer Capability Approval No.Manufacturers Ref. No. BS 9733/XYZ/1234 a The listing of manufacturers in a copy of this document issued by a potential customer is at the custome
40、rs discretion. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9733:1985 4 BSI 01-2000 Blank detail specificationSheet 2 (of 7) Originators component identity number Pulse transformer to BS 9733:1985ISSUE ST
41、ATUS Ratings and characteristics (see 3.3 of BS 9733:1985) DATE Climatic category Maximum temperature range Mass Vibration (see BS 2011-2.1 Fc) Bump (see BS 2011-2.1 Eb) Shock (see BS 2011-2.1 Ea) Solderability (see BS 2011-2.1 Ta) Robustness of terminations (see BS 2011-2.1 Ua, Ub, Uc or Ud as appr
42、opriate) Rapid change of temperature (see BS 2011-2.1 Na) Input(s)Output(s) Peak working voltage Pulse amplitude Pulse rise time Pulse droop Pulse duration Pulse decay time Pulse repetition frequency (P.R.F.) Voltage transformation ratio(s) ImpedancesSource Load(s) Direct current in windings License
43、d Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9733:1985 BSI 01-20005 Blank detail specificationSheet 3 (of 7) Originators component identity number Pulse transformer to BS 9733:1985ISSUE STATUS Inspection require
44、ments (see notes)DATE TEST ILAQLBS 9720:1983 Reference Performance requirements and conditions of test DESIGN VERIFICATION ONLY: 2 specimens, no failures (see 4.2 of BS 9733:1985). Design verification inspection comprises those tests listed below plus all those selected for conformance inspection. D
45、esign verification tests shall only be performed when specifically invoked by the relevant order. Insulation resistance (hot) As required1.2.4.2.2 Temperature riseAs required1.2.4.22 Endurance (short term) As required1.2.7.1 Pulse characteristicsAs required1.2.4.20The appropriate pulse parameters to
46、 be measured shall be specifieda 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 a It may be appropriate to add this information, if required, in tabular form as an appendix. L
47、icensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:21:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9733:1985 6 BSI 01-2000 Blank detail specificationSheet 4 (of 7) Originators component identity number Pulse transformer to BS 9733:1985ISSUE STATUS Inspection
48、requirements (see notes)DATE TEST ILAQLBS 9720:1983 Reference Performance requirements and conditions of test TESTS ON COMPLETED COMPONENTS Visual inspection100 %1.2.2 Dimensions100 %1.2.3 Voltage transformation ratio 100 %1.2.4.16 Voltage proofa 100 %1.2.4.4 Insulation resistance (Standard atmosphe
49、re) 100 %1.2.4.2.1 Induced high voltage100 %1.2.4.5 Pulse characteristics100 %1.2.4.20The appropriate pulse parameters to be measured shall be specifiedb Isolating screens (if an isolating screen is specified) 100 %A test is made to confirm the presence of isolating screens using the method for electrostatic screens 1.2.4.8.1 Inductance and a.c. resistance 100 %1.2.4.7 Leakage inductance100 %1.2.4.14 Phase test100 %1.2.4.26 Acoustic noise100 %1.2.4.25 a This test should be performed before insulation resistance. b It may be appropriate to add this information,
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