BS-9070-6-1971.pdf

BRITISH STANDARD BS 9070: Section 6: 1971 Incorporating Amendment Nos. 1, 2, 3 and 4 Specification for Fixed capacitors of assessed quality: Generic data and methods of test Section 6: Polycarbonate dielectric capacitors and polyethylene terephthalate dielectric capacitors for d.c. use and polypropylene dielectric capacitors for d.c. and a.c. use Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:28:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9070:Section 6:1971 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 04-2000 The following BSI references relate to the work on this standard: Committee references TLE/4 and TLE/4/4 Draft for comment 69/20277 ISBN 0 580 06427 1 Co-operating organizations The Telecommunication Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives 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 Board Cable and Wireless Ltd. Crown Agents for Oversea Governments and Administrations Department of Employment and Productivity (H.M. Factory Inspectorate) Electrical Contractors Association (Incorporated) Electrical Research Association* Electricity Council, the Central Electricity Generating Board and the Area Boards, in England 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 Defence, Navy Department* Ministry of Technology* Post Office* Radio and Electronic Component Manufacturers Federation* Relay Services Association of Great Britain Science Research Council Radio and Space Research Station Scientific Instrument Manufacturers Association Society of British Aerospace 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 British Standard: Radio Society of Great Britain United Kingdom Atomic Energy Authority Amendments issued since publication Amd. No.Date of issueComments 1432May 1974 2803April 1979 3576May 1981 3802August 1982Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:28:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9070:Section 6:1971 © BSI 04-2000i Contents Page Co-operating organizationsInside front cover Forewordiii 6.1General matters1 6.1.1Scope1 6.1.2Related documents1 6.1.3Terminology1 6.1.4Letter symbols, signs and abbreviations1 6.1.5Graphical symbols1 6.1.6Marking of the part and package1 6.1.7Eligibility for qualification approval1 6.1.8Structurally similar parts1 6.1.9Delayed delivery1 6.1.10Supplementary procedure for qualification approval1 6.1.11Certified test records1 6.1.12Standard ratings and characteristics1 6.1.13Unchecked parameters1 6.1.14Procedure to be followed in the event of failures at Group C inspection1 6.1.15Ordering information1 6.1.16Release before completion of Group B inspection1 6.2Test procedures2 6.2.1Measurement conditions2 6.2.2Visual examination2 6.2.3Dimensioning and gauging procedure2 6.2.4Electrical test procedures2 6.2.4.1Preliminary drying2 6.2.4.2Voltage proof2 6.2.4.3Capacitance2 6.2.4.4Tangent of the loss angle2 6.2.4.5Leakage current2 6.2.4.6Impedance2 6.2.4.7Insulation resistance2 6.2.4.8Inductance3 6.2.4.9Outer foil termination3 6.2.4.10Temperature coefficient and cyclic drift3 6.2.4.11Temperature characteristic of capacitance3 6.2.4.12Short term stability3 6.2.4.13Charge/discharge test3 6.2.4.14D.C. surge voltage test4 6.2.4.15Pressure relief test4 6.2.5Mechanical test procedures4 6.2.6Environmental test procedures4 6.2.6.1Robustness of terminations4 6.2.6.2Soldering4 6.2.6.3Rapid change of temperature4 6.2.6.4Bumping4 6.2.6.5Shock4 6.2.6.6Acceleration4 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:28:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9070:Section 6:1971 ii © BSI 04-2000 Page 6.2.6.7Vibration4 6.2.6.8Climatic sequence4 6.2.6.9Damp heat, steady state5 6.2.6.10Container sealing5 6.2.6.11Storage5 6.2.6.12Mould growth5 6.2.6.13Salt mist5 6.2.7Endurance test procedure5 6.3Inspection schedule6 Table 1 Initial and final measurements7 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:28:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9070:Section 6:1971 © BSI 04-2000iii Foreword This section prescribes the specific tests and requirements of Sections 1 and 2 which are applicable to polycarbonate dielectric capacitors, polyethylene terephthalate dielectric capacitors and polypropylene dielectric capacitors. It prescribes the test schedule, giving the specific conditions 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. Summary 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 Copy: London South Bank University, London South Bank University, Fri Dec 08 02:28:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:28:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9070:Section 6:1971 © BSI 04-20001 6.1 General matters 6.1.1 Scope. This section applies to the capacitors listed below for use in equipment for telecommunication and in electronic devices employing similar techniques. 1) Polyethylene terephthalate (PETP) dielectric. 2) Metallized polyethylene terephthalate (PETP) dielectric. 3) Metallized polycarbonate dielectric. 4) Metallized polypropylene dielectric. 6.1.2 Related documents. See 1.1.2. 6.1.3 Terminology. See 1.1.3. 6.1.4 Letter symbols, signs and abbreviations. See 1.1.4. 6.1.5 Graphical symbols. See 1.1.5. 6.1.6 Marking of the part and package. See 1.1.6. 6.1.7 Eligibility for qualification approval. See 1.1.7. 6.1.8 Structurally similar parts. See 1.1.8. 6.1.9 Delayed delivery. See 1.1.9. 6.1.10 Supplementary procedure for qualification approval. See 1.1.10. 6.1.11 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, C1, C3, C4 C5, D1, D2, D3 and D4. 3) Measurements information shall be given for capacitance, tangent of the loss angle and insulation resistance in subgroups C5, D1 and D2. This information shall be presented in grouped frequency tables showing: a) the change of capacitance resulting from the tests, b) the distribution of tangent of the loss angle and insulation resistance prior to the tests and after the tests. 6.1.12 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 rated capacitance shall preferably be selected from the following list chosen from BS 18522). ± 2 % (G), ± 5 % (J), ± 10 % (K) and ± 20 % (M). 3) The d.c. rated voltage be shall preferably be selected from the following list taken from the R5 series of BS 20453) and shall apply to a standard rated temperature of 85 °C. 40, 63, 100, 160, 250, 400, 630 and 1 000 V. Polypropylene capacitors may in addition be given a 50 Hz a.c. rated voltage. The preferred value is 250 V. 4) The preferred environmental categories are: 6.1.13 Unchecked parameters. See 1.1.13. 6.1.14 Procedure to be followed in the event of failures at Group C inspection. See 1.1.14. 6.1.15 Ordering information. See 1.1.15 and 2.4. 6.1.16 Release before completion of Group B inspection. See 1.1.16. 1) BS 2488, “Schedule of preferred numbers for the resistance of resistors and the capacitance of capacitors for telecommunication equipment”. 2) BS 1852, “Marking codes for values and tolerances of resistors and capacitors”. 3) BS 2045, “Preferred numbers”. 55/125/5640/085/2125/085/04 55/085/56 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:28:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9070:Section 6:1971 2 © BSI 04-2000 6.2 Test procedures 6.2.1 Measurements conditions. See 1.2.1. 6.2.2 Visual examination. See 1.2.2. 6.2.3 Dimensioning and gauging procedure. See 1.2.3. 6.2.4 Electrical test procedures 6.2.4.1 Preliminary drying. See 1.2.4.1. 6.2.4.2 Voltage proof. See 1.2.4.2. Omit the capacitor C1 in Figure 4 of 1.2.4.2. 1) Test voltage and points of application: Test point A: 1.6 times the d.c. rated voltage of 4.3 times the a.c. voltage whichever is the greater. Test points B and C: For d.c. rated capacitors, 2UR with a minimum of 200 V. For a.c. rated capacitors, and a.c. test voltage of 2UR+ 1 500 V with a minimum of 2 000 V a.c. 2) Method of applying test voltage for test points B and C: Method 2 of 1.2.4.2.1. 3) Duration of the test: 1 s minimum on 100 % inspection; 60 ± 5 s on other tests. 4) Maximum charge and discharge current: 1 A. 5) Maximum value of time constant: 1 s. Minimum value of time constant: 0.01 s. 6.2.4.3 Capacitance. See 1.2.4.3. 1) Measurement frequency: 1 kHz for CRk 10 4F; 50 or 60 Hz for CR 10 4F. 2) Voltage: Peak voltage 500 pF only. Solderability (with ageing) Subgroup C3Inspection level S-3, AQL 6.5 %. Destructive test 1.2.6.96.2.6.9Damp heat, steady state Subgroup C4Inspection level S-4. AQL 4 % Non-destructive tests 1.2.4.3 1.2.4.7 6.2.4.3 6.2.4.7 Capacitance (at upper category temperature) (see 1.2.1 of BS 9070:Section 1 and BS 9070:Section 2) Insulation resistance (at upper category temperature) Subgroup C5Inspection level S-3, AQL 4 %. Destructive test 1.2.7 1.2.6.8(6) 6.2.7Endurance (1 000 h) Damp heat (accelerated) 2 cycles (-/-121 and -/-/56 only) to be conducted before the final measurements of the endurance test Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:28:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9070:Section 6:1971 © BSI 04-20007 Table 1 Initial and final measurements Subclause numbers Title of test Section 1Section 6 Subgroup C7Inspection level S-3, AQL 4 %. Destructive test 1.2.4.136.2.4.13Charge/discharge test (metallized film types only) Group D inspection(To be applied on a sampling basis at three-yearly intervals) Subgroup D1Inspection level S-3, AQL 4 %. Minimum sample size, 13. Destructive tests Initial measurements (see Table 1) 1.2.6.1 1.2.6.2(2) 1.2.6.7 1.2.6.4 1.2.6.3 1.2.6.8 6.2.6.2(2) 6.2.6.7 6.2.6.3 6.2.6.8 (1) Approximately 50 % of the sample (minimum 7) Robustness of terminations Resistance to soldering heat Visual examination (2) Remainder of the sample (minimum 6) Vibration Visual examination Bump Visual examination (3) Specimens from (1) and (2) combined Rapid change of temperature Climatic sequence Subgroup D2 (i)Inspection level S-3, AQL 4 %. Minimum sample size, 13. Destructive test Initial measurements (see Table 1) 1.2.7 1.2.6.8(6) 6.2.7Endurance (2 000 h) Damp heat (accelerated) 2 cycles (-/-/21 and -/-/56 only) to be conducted before the final measurements of the endurance test Subgroup D2 (ii)This subgroup may not be applicable to all detail specifications and its inclusion shall be as prescribed in the detail specification. Where it is prescribed take the first 12 acceptable samples from D2 (i) and continue the test to 8 000 h. For CTR purposes only Subgroup D3Inspection level S-3, AQL 4 %. Destructive test Initial measurements (see Table 1) 1.2.6.126.2.6.12Mould growth (if required) Subgroup D4Inspection level S-3, AQL 4 %. Destructive test Initial measurements (see Table 1) 1.2.6.136.2.6.13Salt mist (metal cased types only) Inspection subgroups MeasurementB2B7C3C5C7D1D2(i)D3D4 Initial Final Initial Final Initial Final Initial Final Initial Final Initial Final Initial Final Final Initial Final Visual examination x x x x x xx x Capacitance xxxxxxxxxxxxxx x Tangent of loss angle xxxxxxxxxxxxxx x Insulation resistance xxxxxxxx xxxx xx Voltage proof x x NOTEThe measurements, when applicable, shall be conducted in the order shown in Column 1. An “x” in the table indicates that the measurement is applicable. A “” in the table indicates that no measurement is made. 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