Disclosure to Promote the Right To Information

Transcription

1 इ टरन ट म नक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. ज न1 क अ+धक र, ज 1 क अ+धक र Mazdoor Kisan Shakti Sangathan The Right to Information, The Right to Live प0र 1 क छ ड न' 5 तरफ Jawaharlal Nehru Step Out From the Old to the New IS (1982): General requirements and tests for axial lead cores made of magnetic oxides or iron powder [LITD 5: Semiconductor and Other Electronic Components and Devices]! न $ एक न' भ रत क +नम-ण Satyanarayan Gangaram Pitroda Invent a New India Using Knowledge! न एक ऐस खज न > ज कभ च0र य नहB ज सकत ह ह Bhartṛhari Nītiśatakam Knowledge is such a treasure which cannot be stolen

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5 IS: Indian Standard GENERAL REQUIREMENTS AND TESTS FOR AIAL LEAD CORES MADE OF MAGNETIC OIDES OR IRON POWDER Magnetic Components and Ferrite Materials Sectional Committee, LTDC 13 Chairman Representing *DR J. VAID Piece Electronics and Electricals Ltd, Bombay; and The Radio Electronic & Television Manufacturers Association, Bombay Members SHRI V. M. BAPAT ( Alternate Piece Electronics & Electricals Ltd, Bombay to Dr J. Vaid ) SHRI J. P. BHARGAVA National Research Development Corporation of India, New Delhi SHRI R. KRISHNAN ( Alternate ) DR B. K. DAS National Physical Laboratory (CSIR), New Delhi DR R. B. TRIPATHI ( Alternate ) SHRI A. N. DHOOT Elpro International Ltd, Pune SHRI D. P. LAGHATE ( Alternate ) SHRI V. GOPALAKRISHNAN Electronic Components Industries Association ( ELCINA ), New Delhi DR K. K. LAROIA Solid State Physics Laboratory ( Ministry of Defence ), Delhi SHRI PRANKRISHAN ( Alternate ) SHRI A. K. MAJUMDAR Morris Electronics Ltd, Pune SHRI A. PINTO ( Alternate ) DR R. K. MISRA Semiconductors Ltd, Pune DR T. R. BHAT ( Alternate ) SHRI N. R. NAIR Central Electronics Ltd, Sahibabad SHRI M. I. ALAM ( Alternate ) SHRI L. R. PARTHASARTHY Ministry of Railways SHRI RA~I KUMAR ( Alternate ) SHRI S. K. PURI Permanent Magnets Ltd. Bombay SHRI A. M. SAKAF ( Alternate ) ~ _. ~~~ J. Vaid was the Chairman for the meeting in which this standard was Copyright 1983 INDIAN STANDARDS INSTITUTION ( Continued on page 2 ) This publication is protected under the Indian Copyright Act ( IV of 1957 ) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act.

6 IS: ( Continued from page 1 ) Members Representing SHRI M. K. REWAL Posts & Telegraphs Department, New Delhi SHRI R. C. MOHAN ( Alternate ) DR C. S. R. RAO All India Radio, New Delhi BKIG T. P. SABHERWAL Mmistry of Defence ( DGI ) L-r-COL HEMJI AGARWALA ( Alternate ) DR N. S. SATYA MURTHY Bhabha Atomic Research Centre, Bombay SHRI R. SOUNDIRARAJAN Directorate General of Technical Development, New Delhi SHRI C. K. SREENIVAS Bharat Electronics Ltd, Bangalore SHRI R. S~MASEKHARA ( Alternate ) SHRI C. G. SUBRAMANYAN Electronics Trade & Technology Development Corporation Ltd, New Delhi SHRI ISHWAR DUTY ( Alternate ) SHRI G. VENKATESWARLU Ministry of Defence ( R & D ) SHR~ I. N. BHATIA ( Alternate ) SHRI B. M. SHANKAR PRASAD ( Alternate ) SHRI B. VIRESALINGAM Indian Telephone Industries Ltd, Bangalore SHRI H. S. ANANTHANARAYANA RAO ( Alternate ) SHRI R. C. JAIN, Head ( Electronics ) Director General, IS1 ( Ex-officio Member ) SHRI Y. Secretary S. ARYA Deputy Director ( Electronics ), IS1 2

7 Indian Standard IS: GENERAL REQUIREMENTS AND TESTS FOR AIAL LEAD CORES MADE OF MAGNETIC OIDES OR IRON POWDER 0. FOREWORD 0.1 This Indian Standard was adopted by the Indian Standards Institution on 22 October 1982, after the draft finalized by the Magnetic Components and Ferrite Materials Sectional Committee had been approved by the Electronics & Telecommunication Division Council. 0.2 The object of this standard is to establish general requirements and tests for the dimensional and mechanical characteristics of axial lead cores made of magnetic oxides ( ferrites ) or iron powder for use in small wound inductors. 0.3 While preparing this standard, assistance has been derived from IEC Pub Axial lead cores made of magnetic oxides or iron powder issued by the International Electrotechnical Commission ( IEC ). 0.4 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test, shall be rounded off in accordance with IS:2-1960*. The number of 'significant places retained in the rounded off value should be the same as that of the specified value in this standard. 1. SCOPE 1.1 This standard specifies the dimensions, mechanical characteristics and tests for axial lead cores made of magnetic oxides (ferrites) or iron powder for use in small wound inductors, intended primarily for use in telecommunication and allied electronic equipment. 2. CONSTRUCTION 2.1 Axial lead cores consist of a cylindrical body from which lead wires protrude at each end in line with the axis of symmetry. *Rules for rounding off numerical values ( revised). 3

8 IS : The following groups of axial lead cores can be distinguished: a) body consisting of magnetic oxide material with lead wires attached to it after sintering; and b) body consisting of iron powder with lead wires inserted during forming. Details of construction of axial lead cores are given in Appendix A. 3. DIMENSIONS 3.1 Outline Dimensions FIG. 1 OUTLINE DIMENSIONS NOTE - The end faces of the core may be overlaid by an adhesive up to 0.5 mm thick. 3.2 Core Diameter (D) -The core diameter shall have one of the following values: 1.6, 2.0, 2.5, 3.15, 4.0, 5.0, 6.3, 8.0 mm. The tolerances on diameter D shall be as follows: a) Coarse Tolerance - f 3 percent of D or mm, whichever is greater; and b) Normal Tolerance - f 0.5 mm. The manufacturer shall declare which tolerance class, coarse or normal, applies. 3.3 Core Length ( II ) - The core lengths are not specified. The preferred core lengths are as follows: 5, 8, IO, 12.5, 16, 20, 25, 31.5 mm. The tolerance on the length shall be f 5 percent or & 0.35 mm, whichever is greater. 3.4 There are no specified combinations of I, and D,. The preferred combinations of these dimensions are given in Table 1. 4

9 IS : TABLE 1 PREFERRED COMBINATIONS OF CORE LENGTH AND CORE DIAMETER ( Clause 3.4 ) 4 D (1) 5 (2) - 8 (3) All dimensions in millimetres (4) (5) (6) 20 (7) - 25 (8) (9) ; LEAD WIRES 4.1 The diameter ( d) of the lead wires shall be chosen from the series as given in Table 2. TABLE 2 DIAMETER OF LEAD WIRES All dimensions ( Clause 4.1 ) in millimetres. MINIMUM NOMINAL MAIMUM (1) (2) (3) The lengths of the lead wires, I, and I,, shall each be not less than 21 mm; when the manufacturer declares values for I, and I,, the tolerance on the declared value shall be i 10 percent. NOTE - For tape packaging, the overall length should be 75 i 2 mm. 5

10 IS : TESTS 5.1 Visual Examination and Check of Dimensions - The dimensions shall be checked and they shall comply with the specified values. The condition, workmanship, marking and finish shall be satisfactory as determined by visual examination. 5.2 Flexural Strength ( Only Applicable to Cores where the I1 / D Ratio > 3 ) - The flexural strength of an axial lead core shall be tested by the application of bending forces, so that the greatest bending moment occurs near the centre of the test sample. The bending forces shall be steadily increased until the maximum bending moment at a sample crosssection reaches the value specified for its diameter in Table 3. The preferred method for checking the strength is by applying an appropriate force on the axial lead core in such a manner that the point of application is situated at equal distances from the supports. These supports, as well as the loading device, shall be wedge shaped with a radius of about I mm. The distance between supports shall be about 75 percent of the length of the core to be tested ( see Fig. 2 ). The force F, which shall be applied smoothly, is dependent on the core diameter ( see Table 3 ). FIG. 2 FLEURAL STRENGTH TEST 5.3 Robustness of Terminations -The axial lead cores shall be subjected to these tests in accordance with IS : 9000( Part I/Set 1 to 5 ) Tensile Test - The load to be applied shall be as follows: a) for ferrite cores: lead wire 0 5 mm ( nominal diameter ) : 5 N; lead wire 0 6; 0.7; and 0.8 mm ( nominal diameter ) : 10 N. *Basic environmental testing procedures for electronic and electrical items: part I Test for robustness of terminations and internal mounting device. 6

11 IS : b) for iron powder cores: core diameter 1 6; 2-O; 2.5; 3.15 mm : 15 N core diameter 4.0; 5.0; 6.3; 8-O mm : 20 N NOTE - In general, this test shall be carried out after the resistance to soldering heat test of TABLE 3 BENDING MOMENTS ( Clause 5.2 ) NOMINAL CORE DIAMETER (D) MINIMUM BENDING MOMENT A4 FOR BOTH FERRITE CORES AND IRON POWDER CORES (1) (2) mm N.m 1.6 0, NOTE 1 - The loading force F is calculated from the bending moment M given in Table 3 by F=4T. NOTE 2 - When this test is applied to cores with continuous grooves, the point of application of the force F shall be at approximately right angle to these grooves Bending Test - Two bends according to method 1 with half the load as specified in shall be applied Torsion Test - The terminations shall be subjected to severity 2 having two rotations of Requirements - After each of these three tests, the axial lead cores shall be examined visually. There shall be no visible damage. 7

12 IS : Soldering Solderability Test - The procedure for testing the solderability of terminations for axial lead cores shall be in accordance with Set 1 of IS :9000( Part VIII/Set 1 to 3 ) The requirements for the appropriate procedure using either solder bath or soldering iron methods, given in Set 1 of IS: 9000( Part VIII/Set 1 to 3 )-1981 shall be satisfied. In case of the solder globule method, the detail specification shall indicate the requirement of soldering time Resistance to Soldering Heat Test - The procedures for testing the resistance to soldering heat of axial lead cores shall be in accordance with Method lb, given in Set 2 of IS:9000( Part VIII/Set 1 to 3 )-1981* with the exception that the immersion is up to 6 mm from the end face. When the test procedures have been carried out, the axial lead cores shall be examined visually. There shall be no visible damage. APPENDI A ( Clause 2.2 ) CONSTRUCTION OF AIAL LEAD CORES ( THIRD ANGLE PROJECTION ) A-l. END FORMS A-l.1 Axial lead cores can be manufactured with straight cut end faces. However, alternative end forms are also used. A number of possible end forms are given below. *Basic environmental testing procedures for electronic and electrical items: Part VIII Solderability test. 8

13 IS: A-2. STEP ENDED A-2.1 The step ended form is shown in Fig, 3. l-j---i R f g mm mm mm 1%; 20 D ; o; 5 0 D I.0 6.3; 8.0 T FIG. 3 STEP ENDED A-3. SLOPE ENDED A-3.1 The slope ended form is shown in Fig. 4. W D I*;;-0 2.5; 3.15 h mm D -7 E j 4.0; 5.0 D ; 8.0 T FIG. 4 SLOPE ENDED 9

14 IS : A-4. NICK ENDED A-4.1 The nick ended form is shown in Fig. 5. D k mm 1J.y?~O D 2.5; SECTION A-A I m (A4ux) mm mm D NOTE - 4.0; 5.0 D D ; 8.0 -T 3 FIG. 5 NICK END& The ends of examples of A-2 to A-4 may be offset 180 from each other. A-5. WITH CONTINUOUS GROOVES A-5.1 The end form with continuous grooves is shown in Fig. 6. cl l-d SECTION A-A D k I 1.gm2.0 D D - 2.5: 3.15 T 3 4.0; 5.0 D D 6.3; FIG. 6 AIAL CORE WITH CONTINUOUS GROOVES 10