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1、BRITISH STANDARD BS 9070: Section 4:1971 Incorporating Amendment Nos. 1, 2 and 3 Specification for Fixed capacitors of assessed quality: Generic data and methods of test Section 4: Polystyrene dielectric capacitors UDC 621.39.03:621.319.4 Licensed Copy: London South Bank University, London South Ban
2、k University, Fri Dec 08 02:28:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9070: Section 4:1971 This British Standard, having been approved by the Telecommunication Industry Standards Committee, was published under the authority of the Executive Board on 18 February 1971 BSI 01-2000 The followi
3、ng BSI references relate to the work on this standard: Committee references TLE/4 and TLE/4/4 Draft for comment 69/5569 ISBN 0 580 06417 4 Co-operating organizations The Telecommunication Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representa
4、tives from the following Government departments and scientific and industrial organizations: British Broadcasting Corporation* British Electrical and Allied Manufacturers Association British Radio Equipment Manufacturers Association* British Radio Valve Manufacturers Association British Railways Boa
5、rd Cable and Wireless Ltd. Crown Agents for Oversea Governments and Administrations Department of Employment and Productivity Electrical Contractors Association (Incorporated) Electrical Research Association* Electricity Council, the Central Electricity Generating Board and the Area Boards, in Engla
6、nd and Wales* Electronic Engineering Association* Electronic Valve and Semiconductor Manufacturers Association Institution of Electrical Engineers* Institution of Electronic and Radio Engineers* Institution of Production Engineers Ministry of Defence Ministry of Defence, Army Department Ministry of
7、Defence, Navy Department* Ministry of Technology* Post Office* Radio and Electronic Component Manufacturers Federation* Relay Services Association of Great Britain Scientific Instrument Manufacturers Association Science Research Council Radio and Space Research Station* Society of British Aerospace
8、Companies* Telecommunication Engineering and Manufacturing Association* The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following were directly represented on the committee entrusted with the preparation of this Brit
9、ish Standard: Radio Society of Great Britain United Kingdom Atomic Energy Authority Amendments issued since publication Amd. No.Date of issueComments 1514July 1974 1666February 1975 3800May 1982Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank Unive
10、rsity, Fri Dec 08 02:28:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9070: Section 4:1971 BSI 01-2000i Contents Page Co-operating organizationsInside front cover Forewordiii 4.1General matters1 4.1.1Scope1 4.1.2Related documents1 4.1.3Terminology1 4.1.4Letter symbols, signs and abbreviations1 4.
11、1.5Graphical symbols1 4.1.6Marking of the part and package1 4.1.7Eligibility for qualification approval1 4.1.8Structurally similar parts1 4.1.9Delayed delivery1 4.1.10Supplementary procedure for qualification approval1 4.1.11Certified test records1 4.1.12Standard ratings and characteristic1 4.1.13Un
12、checked parameters2 4.1.14Procedure to be followed in the event of failures at Group C inspection2 4.1.15Ordering information2 4.1.16Release before completion of Group B inspection2 4.2Test procedures2 4.2.1Measurement conditions2 4.2.2Visual examination2 4.2.3Dimensioning and gauging procedure2 4.2
13、.4Electrical test procedures2 4.2.4.1Preliminary drying2 4.2.4.2Voltage proof2 4.2.4.3Capacitance2 4.2.4.4Tangent of the loss angle2 4.2.4.5Leakage current2 4.2.4.6Impedance2 4.2.4.7Insulation resistance2 4.2.4.8Inductance3 4.2.4.9Outer foil termination3 4.2.4.10Temperature coefficient and cyclic dr
14、ift3 4.2.4.11Temperature characteristic of capacitance3 4.2.4.12Short term stability3 4.2.4.13Charge/discharge test3 4.2.4.14D.C. surge voltage test3 4.2.4.15Pressure relief test3 4.2.5Mechanical tests3 4.2.6Environmental test procedures3 4.2.6.1Robustness of terminations3 4.2.6.2Soldering3 4.2.6.3R
15、apid change of temperature4 4.2.6.4Bump4 4.2.6.5Shock4 4.2.6.6Acceleration4 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:28:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9070: Section 4:1971 ii BSI 01-2000 Page 4.2.6.7Vibration4 4.2.6.8Climatic sequence
16、4 4.2.6.9Damp heat, steady state4 4.2.6.10Container sealing4 4.2.6.11Storage4 4.2.6.12Mould growth4 4.2.6.13Salt mist4 4.2.7Endurance test procedures5 4.3Inspection schedule5 Table 1 Initial and final measurements7 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08
17、 02:28:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9070: Section 4:1971 BSI 01-2000iii Foreword This section prescribes the specific tests and requirements of Sections 1 and 2 which are applicable to polystyrene film and foil capacitors. It prescribes the test schedule giving the specific condi
18、tions as required by Sections 1 and 2. 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. Su
19、mmary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 7 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 C
20、opy: London South Bank University, London South Bank University, Fri Dec 08 02:28:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:28:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9070: Section 4:1971 B
21、SI 01-20001 4.1 General matters 4.1.1 Scope. This section applies to polystyrene dielectric film and foil capacitors for use in equipment for telecommunication and in electronic devices employing similar techniques. 4.1.2 Related documents. See 1.1.2. 4.1.3 Terminology. See 1.1.3. 4.1.4 Letter symbo
22、ls, signs and abbreviations. See 1.1.4. 4.1.5 Graphical symbols. See 1.1.5. 4.1.6 Marking of the part and package. See 1.1.6. 4.1.7 Eligibility for qualification approval. See 1.1.7. 4.1.8 Structurally similar parts. See 1.1.8. 4.1.9 Delayed delivery. See 1.1.9. 4.1.10 Supplementary procedure for qu
23、alification approval. See 1.1.10. 4.1.11 Certified test records 1) Certified test records shall be prepared in accordance with 1.1.11. 2) Attributes information shall be given for the following subgroups: A1, A2, A3, B1, B2, B7, C1, C3, C4, C5, D1, D2, D3, D4 and D5. 3) Measurements information shal
24、l be given for capacitance, tangent of the loss angle and insulation resistance after Subgroups C5, D1 and D2. The information shall be presented in group frequency tables showing: a) the change resulting from the test in the case of capacitance, b) the distribution prior to the test and after the t
25、est in the case of tangent of the loss angle and insulation resistance. 4.1.12 Standard ratings and characteristics. See 1.1.12. 1) Standard values of rated capacitance shall preferably be taken from the E6 series of BS 24881). 2) The tolerances on capacitance shall preferably be selected from the f
26、ollowing list chosen from BS 18522): 0.5 % (D); 1 % (F); 2 % (G); 5 % (J) and 10 % (K) for capacitance values 100 pF; 1 pF (F), 2 pF (G), 5 pF (J) and 10 pF (K) for capacitance values u 100 pF. 3) Rated voltages shall preferably be selected from the following list taken from the R5 series of BS 2045
27、3): 25, 63, 100, 160, 250, 400, 630, 1 000, 1 600, 2 500, 4 000 and 6 300 V. 4) Standard values of temperature coefficient and its tolerance 60 to 220 parts per million per degree Celsius 90 30 parts per million per degree Celsius 100 to 200 parts per million per degree Celsius. 130 40 parts per mil
28、lion per degree Celsius 170 50 parts per million per degree Celsius 5) Environmental category: The following are preferred: 55/085/56 25/070/56 40/070/21 10/070/21 40/070/A4 10/070/04 1) BS 2488, “Schedule of preferred numbers for the resistance of resistors and the capacitance of capacitors for tel
29、ecommunication equipment”. 2) BS 1852, “Marking codes for values and tolerances of resistors and capacitors”. 3) BS 2045, “Preferred numbers”. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:28:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9070: Section 4:
30、1971 2 BSI 01-2000 4.1.13 Unchecked parameters. See 1.1.13. 4.1.14 Procedure to be followed in the event of a failure at Group C inspection. See 1.1.14. 4.1.15 Ordering information. See 1.1.15. 4.1.16 Release before completion of Group B inspection. See 1.1.16. 4.2 Test procedures 4.2.1 Measurement
31、conditions. See 1.2.1. 4.2.2 Visual examination. See 1.2.2. 4.2.3 Dimensioning and gauging procedure. See 1.2.3. 4.2.4 Electrical test procedures 4.2.4.1 Preliminary drying. See 1.2.4.1. 4.2.4.2 Voltage proof. See 1.2.4.2. 1) Test voltage and points of application: Test Point A: 2UR Test Point C: 2U
32、R with a minimum of 200 V. 2) Method of applying test voltage: Method 2 of 1.2.4.2.1. 3) Duration of test: 1 s minimum on 100 % inspection 1 min 5 s other tests. 4) Maximum charging and discharging current: 1 A. 5) Maximum value of time constant: 10 ms. 4.2.4.3 Capacitance. See 1.2.4.3. 1) Measureme
33、nt frequency: For CRu 1 000 pF: 100 kHz or 1 MHz. The measure at 100 kHz shall be the reference method. For CR 1 000 pF: 1 kHz. 2) Applied voltage: shall not exceed 3 % of UR or 5 V whichever is the less. 3) Limits of absolute measurement accuracy: See 1.2.4.3.1 1). The accuracy for any value CR sha
34、ll be such that the relative error, expressed as a percentage, does not exceed the following: where t = tolerance on CR in per cent CR= rated capacitance in pF. For values less than 100 pF to which fixed tolerances are applicable the above reduces to: Accuracy (pF) = 0.1(%C + 1) where %C = fixed tol
35、erance on CR in pF. 4.2.4.4 Tangent of the loss angle. See 1.2.4.4. 4.2.4.5 Leakage current. Not applicable. 4.2.4.6 Impedance. Not applicable. 4.2.4.7 Insulation resistance. See 1.2.4.7. 1) Measuring voltage and measuring points: As 1.2.4.7.1 Test points A, B or C as appropriate. 2) Method of apply
36、ing test voltage: Method 2 of 1.2.4.2.1. 3) Time of electrification: 1 min 5 s. except that in Group A (lot by lot testing) the test may be terminated in a shorter time if the required value of insulation resistance is reached. 4) Special precautions: Voltage shall be applied immediately through the
37、 internal resistance of the test apparatus. The product of this internal resistance and the rated capacitance of the capacitor under test shall not exceed 1 s. Accuracy %() 0.1 t 100 CR - -+ = Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:28:41 GMT+00:00 20
38、06, Uncontrolled Copy, (c) BSI BS 9070: Section 4:1971 BSI 01-20003 5) Correction factors: This table is based upon the formula: 4.2.4.8 Inductance. See 1.2.4.8. 4.2.4.9 Outer foil termination. See 1.2.4.9. 4.2.4.10 Temperature coefficient and cyclic drift. See 1.2.4.10. 4.2.4.11 Temperature charact
39、eristic of capacitance. Not applicable. 4.2.4.12 Short term stability. Not applicable. 4.2.4.13 Charge/discharge test. Not applicable. 4.2.4.14 D.C. surge voltage test. Not applicable. 4.2.4.15 Pressure relief test. Not applicable. 4.2.5 Mechanical test procedures. Not applicable. 4.2.6 Environmenta
40、l test procedures 4.2.6.1 Robustness of terminations. See 1.2.6.1. 4.2.6.2 Soldering. See 1.2.6.2 (Period of recovery: Not less than 1 h nor more than 2 h). 1) Solderability. Method 3, Solder globule. The terminations shall not be degreased. Non-activated flux shall be used. The test shall be applie
41、d at any point on the terminations. 2) Resistance to soldering heat: Method 1, Solder bath, 350 C. Temperature (C) Correction factor 150.84 160.87 170.90 180.93 190.97 201.00 211.04 221.07 231.11 241.15 251.19 261.23 271.27 281.32 291.37 301.41 311.46 321.52 331.57 341.62 351.68 where Rt= insulation
42、 resistance measured at temperature t C. R20= insulation resistance at 20 C. R20Rt2 t20 20 - - = Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:28:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9070: Section 4:1971 4 BSI 01-2000 4.2.6.3 Rapid change of tem
43、perature. See 1.2.6.3. 1) Duration of exposure to high and low temperatures: 30 min. 2) Period of recovery: Not less than 1 h, nor more than 2 h. 4.2.6.4 Bump. See 1.2.6.4. 4.2.6.5 Shock. Not applicable. 4.2.6.6 Acceleration. Under consideration. 4.2.6.7 Vibration. See 1.2.6.7. During the last 30 mi
44、n of test the rated voltage shall be applied with means of detecting open or short circuits with a duration of 0.5 ms or more. There shall be no such open or short circuits. 4.2.6.8 Climatic sequence. See 1.2.6.8. 1) Initial measurements: See Table 1 for Subgroup B2 or D5 as appropriate. 2) Dry heat
45、 duration: 16 h. 3) Damp heat accelerated. First cycle (omitted for -/-/04 and -/-/A4). 4) Cold duration: 2 h. 5) Low air pressure: Subgroup D1 only. a) Duration: 5 min. b) Temperature: 1535 C. Whilst at the low air pressure the specimens shall be subjected to the rated voltage for the last minute o
46、f the test period using test point A, B or C as appropriate. 6) Damp heat accelerated: Remaining cycles as 1.2.6.8 6) for Subgroup D1. One cycle only in Subgroup B2 for -/-/A4, -/-/21 and -/-/56. Within 15 min of removal from the damp heat test the voltage proof test of 4.2.4.2 shall be carried out
47、but with a voltage equal to the rated voltage. 7) Final measurements: See Table 1 for Subgroups B2 and D1 as appropriate. 4.2.6.9 Damp heat, steady state. See 1.2.6.9. 1) Initial measurements: As for Subgroup C3 in Table 1. 2) Voltage: Within 15 min of removal from the damp heat test the voltage pro
48、of test of 4.2.4.2 shall be carried out but using the rated voltage. 3) Final measurements: As for Subgroup C3 in Table 1. 4.2.6.10 Container sealing. Not applicable. 4.2.6.11 Storage. See 1.2.6.11. 1) Storage at high temperature: Not applicable. 2) Storage at low temperature: See 1.2.6.11 2). Initi
49、al measurements: As for Subgroup D5 in Table 1. Final measurements: As for Subgroup D5 in Table 1. 4.2.6.12 Mould growth (if required by the detail specification). See 1.2.6.12 (except -/-/04 and -/-/A4). 1) Initial measurements: As Subgroup D3 in Table 1. 2) Period of exposure: 28 days. 3) Final measurements: As Subgroup D3 in Table 1. 4.2.6.13 Salt mist. See 1.2.6.13. Metal cased styles (if required by the detail specification). 1) Initial measurements: As Subgroup D4 in Table 1.
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