Please refer to this standard for details. GB/T 2471-1995 Resistors and capacitors priority number system GB/T2471-1995 standard download decompression password: www.bzxz.net

GB/T2471—1995
This standard is equivalent to the international standard IEC63:1963 "Preferred number series for resistors and capacitors" and its "Amendment No. 1" (1967) and "Amendment No. 2" (1977).
By making the Chinese standard equivalent to the international standard, it meets the needs of international trade, technology and economic exchanges. This standard is the first revised version of the national standard GB2471-81 "Nominal resistance series of resistors for electronic equipment and nominal capacity series of fixed capacitors and their allowable deviation series". This revised version directly compiles the contents of the above two amendments to IEC63 in the relevant clauses, and changes the name of the standard to "Preferred number series for resistors and capacitors" for ease of use; in addition, the allowable deviation series in Chapter 3 of GB2471-81 and the restrictive use instructions under Table 1 in Chapter 1 are deleted and replaced with the instructions on the composition of each series in IEC63, which is consistent with the international standard. The deleted content can be specified in the relevant standards adopting this standard.
This standard shall replace GB2471-81 from the date of implementation. This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Standardization Institute of the Ministry of Electronics Industry. The drafting unit of this standard: the Standardization Institute of the Ministry of Electronics Industry. The main drafters of this standard: Liu Kuan and Huo Guang. This standard was first issued in July 1981.
GB/T2471-1995
IEC Before
1) The formal resolutions or agreements of the EC (International Electrotechnical Commission) on technical issues are formulated by technical committees participated by national committees with special concerns about these issues, and represent the international consensus on the issues involved as much as possible. 2) These resolutions or agreements are used internationally in the form of recommended standards and are recognized by national committees in this sense. 3) In order to promote international unification, IEC hopes that national committees will adopt IEC standard texts as their national standards if their national conditions permit. The differences between IEC standards and corresponding national standards should be indicated in national standards as much as possible. 4) It is desirable that, wherever national conditions permit, national standards be harmonized with these standards in order to promote international agreement on these matters, and that the National Committees work towards this goal. Foreword
This standard has been prepared by EC Technical Committee 40 (Capacitors and resistors for use in electronic equipment). During the discussions of the 12th Technical Committee (Radiocommunications) at the Stockholm Conference in 1948, it was agreed that one of the most urgent subjects for international standardization was the preferred number series for resistors and capacitors below 0.1 μF. Although it would have been desirable to standardize these series on the /10 number system, it would have been impractical to change commercial practice in several countries where the /10 number system has been adopted for standardization of the above components for 5%, 10% and 20% tolerances.
Although the /10 number system is more in line with ISO practice, in view of the current situation, this committee can only regret that it has to recommend the /10 number system.
The series of proposals with priority numbers E6, E12 and E24 were accepted at the Paris Conference in 1950, and subsequently IEC Standard 63 (First Edition) was published.
Now, the content of IEC Standard 63 (First Edition) is republished as the first part of this standard. The countries that agreed to publish the first edition of IEC Standard 63 as an IEC standard are: Argentina
Australia
Austria
Belgium
Canada
Czechoslovakia
Hungarywww.bzxz.net
Israel
Italy
Portugal
Yugoslavia
GB/T 2471—1995
When republishing, some editorial changes were made to the first part "Scope". The original wording of paragraphs a) and b) was as follows: a) The resistance of wirewound fixed resistors and composite fixed resistors, in Q; b) The capacitance of capacitors less than or equal to 100000 pF, in pF. A few years after the first edition of IEC 63 was published, the series could not meet the need for IEC standards for some components. In 1957, the British National Committee recommended that the E48 and E96 series be considered as extensions of IEC 63. After discussions on this topic in Zurich in 1957 and in Stockholm in 1958, a working group was appointed with the task of preparing a proposal.
In September 1959, the working group held a meeting in The Hague. The results of the meeting were discussed by the 40-1 Technical Committee (now the 40 Technical Committee "Capacitors and resistors for electronic equipment") at the Ulm meeting in early October 1959. As a result of the discussion at this meeting, a draft containing the recommended series of the working group was submitted to the national committees for approval in March 1960 according to the "six-month method". In the process of this document formulation, close contact was always maintained with ISO/TC19 (priority number). The following countries voted explicitly in favor of including the series for precision components as a second publication: Argentina
Belgium
Denmark Netherlands
France Norway
Czechoslovakia
Countries opposing:
Italy
Romania
Yugoslavia
Despite the large number of votes against, it was decided at the TC40 meeting held in Nice in 1962 that these series should be published, as it was obviously impossible to obtain more votes in favor at this stage. V
1Scope
National Standard of the People's Republic of China
Preferred number series for resistors and capacitors
Preferred number series for resistors and capacitorsPart 1
Preferred number series for resistors and capacitors
GB/T2471—1995
idtIEC63:1963
Replaces GB2471—81
The values ​​given in Table 1 and their decimal multiples or approximate divisors are the preferred number series with allowable deviations, used for: a) resistance values ​​of resistors;
b) capacitance values ​​of capacitors.
2 Number series table
Allowable deviation
3 Explanation
Allowable deviation
Allowable deviation
Allowable deviation
>±20%
Allowable deviation
Allowable deviation
E24 series is composed of the rounded value of 10 theoretical numbers, where n is a positive or negative integer. E12 series is composed of the rounded value of 10° theoretical numbers, and is formed by omitting every other item in E24 series. E6 series is composed of the rounded value of 10 theoretical numbers, and is formed by omitting every other item in E12 series. E6 approved by the State Technical Supervision Bureau on December 22, 1995
Allowable deviation
Allowable deviation
>±20%
Implementation on August 1, 1996
GB/T2471—1995
E3 series is composed of the rounded value of 10*theoretical number, and is formed by omitting the E6 series items. Part 2 Preferred number system for precision resistors and capacitors 4 Range
The values ​​and their decimal multiples or divisors given in Table 2 are the preferred number system for: a) the resistance value of fixed resistors;
b) the capacitance value of fixed capacitors.
These series are only considered when the allowable deviation of the component is stricter than 5% and when the E24 series (see Part 1 of this standard) cannot meet the needs due to special requirements.
5 Number system table
332332
6 Explanation
GB/T2471—1995
Table 2 (end)
The E192 series consists of the rounded values ​​of the theoretical numbers of /10, where n is a positive or negative integer. E48
The E96 series consists of the rounded values ​​of the theoretical numbers of /10, and is formed by omitting every other item in the E192 series. The E48 series consists of the rounded values ​​of the theoretical numbers of 10, and is formed by omitting every other item in the E96 series. E192
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