1、BRITISH STANDARD BS 9733:1985 Sectional specification for pulse transformers of assessed quality for use in electronic equipment for capability approval UDC 621.314.2BS9733:1985 This British Standard, having been prepared under the directionof the Electronic Components Standards Committee, was publi
2、shed underthe authority of the BoardofBSI and comes into effect on 29November1985 BSI 01-2000 First published December 1978 First revision November 1985 The 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 Commi
3、ttees responsible 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: Beama Transmission and Distribution Association Electronic Compo
4、nents Industry Federation Electronic Engineering Association Engineering Equipment and Materials Users Association Ministry of Defence National Supervising Inspectorate Society of British Aerospace Companies Limited Telecommunications Engineering and Manufacturing Association (TEMA) United Kingdom A
5、tomic Energy Authority Amendments issued since publication Amd. No. Date of issue CommentsBS9733:1985 BSI 01-2000 i Contents Page Committees responsible 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 i
6、n the detail specification 2 5 Detail specification 2BS9733:1985 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 pulse transformers
7、 released under the terms of the BS9000/BS9720 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 clea
8、r guidance is given on the suitable test inspection levels. Changes brought about by the revision of BS9720 are also incorporated where appropriate. As an assessment level for the document is now inappropriate, this standard supersedes both BS9733:1978 and BS9734:1978, which are withdrawn. It is int
9、ended 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 manufacturer, e.g.for customers detail specifications (CDSs). b) A capability approved manufacturer of pulse transformers wi
10、shing 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 S
11、tandard 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, pages1 to 9 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be i
12、ndicated in the amendment table on the inside front cover.BS9733:1985 BSI 01-2000 1 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 BS9720 capabilit
13、y 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.
14、It also lists appropriate ratings and characteristics. 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, l
15、ow power pulse transformers are regarded 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 requi
16、rements 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 and BS CECC qualified products list. NOTEBS6001 and BS9720 should be available for reference
17、when preparing detail specifications. 3 Preparation of the detail specification 3.1 General A detail specification shall be prepared in accordance with2.6.1 of BS9720:1983. NOTE 1The detail specification takes the form of the BDS shown in clause 5, particularly in respect of the front page format an
18、d, in principle, in respect of the presentation of the inspection requirements. NOTE 2All the tests shown in the BDS are taken from BS9720. Those shown in bold type concern operating characteristics of fundamental importance and it is strongly recommended that these are selected by the specification
19、 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. Howeve
20、r, 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 BS9720 are required, these shall be fully specified in the detail specifi
21、cation. 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 indi
22、cated 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 and issue status by the originator. NOTE 1This
23、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 PD9002, BSI
24、 will allocate an appropriate number in accordance with15.11 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 code letters and a unique number within his regis
25、tration system, e.g.BS9733/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 be retained by the manufacturers chief inspector
26、. 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 c
27、apability approval (seealso1.1.12 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 specification shall incorporate a drawing of the transform
28、er showing important features, such as those dimensions affecting interchangeability, restrictions on mounting and marking requirements.BS9733:1985 2 BSI 01-2000 3.4.2 The detail specification shall incorporate a schematic diagram showing all windings, screens, taps and phasings and giving terminati
29、on identification. 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 inspection. b) Tests in a group may be carrie
30、d 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: measurement uncertainty is to be taken into account
31、. 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 specifically so stated
32、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
33、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 changes will be necessary, but the basic fo
34、rmat should be retained.BS9733:1985 BSI 01-2000 3 Blank detail specification Sheet 1 (of 7) Originators component identity number Specification available from: SPECIFICATION ISSUE STATUS DATE ELECTRONIC COMPONENTS OF ASSESSED QUALITY MANUFACTURER(S) REFERENCE NUMBERS SEE NOTES 1 AND 2 BELOW a DETAIL
35、 SPECIFICATION IN ACCORDANCE WITH BS 9733:1985 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 BS9720 Capability Approval Certificate (listed in PD9002) fo
36、r such wound components defined herein, i.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
37、 by a potential customer is at the customers discretion.BS9733:1985 4 BSI 01-2000 Blank detail specification Sheet 2 (of 7) Originators component identity number Pulse transformer to BS9733:1985 ISSUE STATUS Ratings and characteristics (see3.3 of BS9733:1985) DATE Climatic category Maximum temperatu
38、re range Mass Vibration (see BS2011-2.1 Fc) Bump (see BS2011-2.1 Eb) Shock (see BS2011-2.1 Ea) Solderability (see BS2011-2.1 Ta) Robustness of terminations (see BS2011-2.1 Ua, Ub, Uc or Ud as appropriate) Rapid change of temperature (see BS2011-2.1 Na) Input(s) Output(s) Peak working voltage Pulse a
39、mplitude Pulse rise time Pulse droop Pulse duration Pulse decay time Pulse repetition frequency (P.R.F.) Voltage transformation ratio(s) Impedances Source Load(s) Direct current in windingsBS9733:1985 BSI 01-2000 5 Blank detail specification Sheet 3 (of 7) Originators component identity number Pulse
40、 transformer to BS 9733:1985 ISSUE STATUS Inspection requirements (see notes) DATE TEST IL AQL BS 9720:1983 Reference Performance requirements and conditions of test DESIGN VERIFICATION ONLY: 2 specimens, no failures (see4.2 of BS9733:1985). Design verification inspection comprises those tests liste
41、d below plus all those selected for conformance inspection. Design verification tests shall only be performed when specifically invoked by the relevant order. Insulation resistance (hot) As required 1.2.4.2.2 Temperature rise As required 1.2.4.22 Endurance (short term) As required 1.2.7.1 Pulse char
42、acteristics As required 1.2.4.20 The appropriate pulse parameters to be measured shall be specified a 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% 1.2.2.1 a It may be appropriate
43、to add this information, if required, in tabular form as an appendix.BS9733:1985 6 BSI 01-2000 Blank detail specification Sheet 4 (of 7) Originators component identity number Pulse transformer to BS 9733:1985 ISSUE STATUS Inspection requirements (see notes) DATE TEST IL AQL BS 9720:1983 Reference Pe
44、rformance requirements and conditions of test TESTS ON COMPLETED COMPONENTS Visual inspection 100% 1.2.2 Dimensions 100% 1.2.3 Voltage transformation ratio 100% 1.2.4.16 Voltage proof a 100% 1.2.4.4 Insulation resistance (Standard atmosphere) 100% 1.2.4.2.1 Induced high voltage 100% 1.2.4.5 Pulse ch
45、aracteristics 100% 1.2.4.20 The appropriate pulse parameters to be measured shall be specified b Isolating screens (if an isolating screen isspecified) 100% A test is made to confirm the presence of isolating screens using the method for electrostatic screens1.2.4.8.1 Inductance and a.c.resistance 1
46、00% 1.2.4.7 Leakage inductance 100% 1.2.4.14 Phase test 100% 1.2.4.26 Acoustic noise 100% 1.2.4.25 a This test should be performed before insulation resistance. b It may be appropriate to add this information, if required, in tabular form as an appendix.BS9733:1985 BSI 01-2000 7 Blank detail specifi
47、cation Sheet 5 (of 7) Originators component identity number Pulse transformer to BS 9733:1985 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) Continuity S4 1% 1.2.4.1.2
48、Self capacitance S4 1% 1.2.4.15.1 Impedance unbalance S4 1% 1.2.4.11 Capacitance unbalance S4 1% 1.2.4.10 Voltage unbalance S4 1% 1.2.4.12 Resistance unbalance S4 1% 1.2.4.13 D.C. winding resistance S3 1.5% 1.2.4.1.1 Insulation resistance (hot) S3 1.5% 1.2.4.2.2 Electrostatic screen(s) S3 1.5% 1.2.4
49、.8.1BS9733:1985 8 BSI 01-2000 Blank detail specification Sheet 6 (of 7) Originators component identity number Pulse transformer to BS 9727:1985 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) Magnetic shielding S1 4% 1.2.4.6.1 Magnetic radiation S1 4% 1.2.4.24 Endurance short term S1 4% 1.2.7.1 Temperature rise S1 4% 1.2.4.22 Voltage-time product rating S1 4% 1.2.4.27 Insert additional tests as required: NOTE 1Sampling inspec
