ECA RS-385-1970 Preferred Values.pdf

1、L EIA 385 70 3234600 0066797 O = .-/- - ANSI C8 3.2 -1971 a - Y (Revision of C83.2-1949) Approved November 1, 1971 AMERICAN NATIONAL STANDARDS INSTITUTE HA STANDARD Preferred Values RS-385 (Revision of GEN-102) December 1970 P. EIA 385 70 3234600 00bb8 2 NOTICE EIA engineering standards are designed

2、 to serve the public interest through eliminating mis- understandings between manufacturers and purchasers, facilitating interchangeability and improve- ment of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence o

3、f such standards shall not in any respect pre- clude any member or non-member ofEIA from manufacturing or selling products not conforming to such standards, nor shall the existence of such standards preclude their voluntary use by those other than EIA members whether the standard is to be used eithe

4、r domestically or internationally. Recommended standards are adopted by EIA without regard to whether or not their adoption may involve patents on articles, materials, or processes. By such action, EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to p

5、arties adopting the recommended standards. Published by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 2001 Eye Street, N.W., Washington, D. C. 20006 Electronic Industries Association 1970 Ail rights reserved PRICE: $1.00 Printed in U.S.A. EIA 385 70 3234b00 00bb999 4 PREFERRED VALUES (Fro

6、m EIA Standard GEN-1 02 and Standards Proposal No. 1059, formulated under the cognizance of the EIA CN Committee on Colors and Numbers.) * 1. SCOPE This standard establishes six series of numbers which may be used as preferred values in the design of electronic components, equipment or systems. 2. P

7、REFERRED VALUES The series of preferred values, with associated values of tolerance, are shown in the accompanying Table. These preferred values, and decimal multiples thereof, shall be standard. 3. EXPLANATORY NOTES Each series starts with unity, and successive values are related by a multiplying f

8、actor, as follows: Series Factor O f 20% Series dm (1.46 approx.) 12 (1.21 approx.) f 10% Series f 5%eries “a (1.10 approx.) f 2%Series “a (1.05 approx.) f 1% Series k O. i%, f 0.25%, f 0.5% Series 96 a (1.02 approx.) 192 ./io (1.01 approx.) All 20, 10 and 5 percent series values are rounded to two

9、significant figures. All 2, 1 and 0.5 percent values are rounded to three significant figures. RS-385 Page 1 EIA 385 70 m 3234b00 00b7000 5 m RS-385 Page 2 I TOLERANCE f 59 - 1.0 - 1.1 - 1.2 1.3 - 1.5 - 1.6 - 1.8 - 1. O I tio9 1.0 - 1.2 - 1.5 - .8 t2w 1.c - - 1 .,5 - * These i TOLERANCE I TOLERANCE % and &O. 1%. k 5% 4.7 - - 5.1 5.6 6.2 6.8 - 7.5 - 8.2 - 9.1 k 1070 - 4.7 5.6 6.8 8.2 m , 3%-