This standard specifies the marking codes for resistors and capacitors. These codes and color codes are used to represent the E6 to E192 series values ​​specified in IEC 63 "Preferred number system for resistors and capacitors". GB/T 2691-1994 Marking codes for resistors and capacitors GB/T2691-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Marking codes for resistors and capacitors
Marking codes for resistors and capacitors This standard is equivalent to the international standard IEC 62 (1992) "Marking codes for electrical appliances and capacitors". 1 Scope
This standard specifies the marking codes for resistors and capacitors. The color codes specified in Article 2 are used to mark resistors. GB/T 2691-94
IEC 62-1992
Replaces GB2691-81
These codes and color codes are used to indicate the E6 to E192 series values ​​specified in IFC63 "Preferred number system for resistors and capacitors". The codes specified in Article 3 systematically give the method of marking resistance values ​​and capacitance with letters and numbers. The codes specified in Article 4 systematically give the method of marking the allowable deviation of resistance values ​​and capacitance with a letter. The codes specified in Article 5 systematically give the method of marking the manufacturing date of resistors and capacitors with letters and numbers. 2 Color code of fixed resistors
2.1 The color code using two or three significant digits to indicate the resistance value, allowable deviation and temperature coefficient of fixed resistors (when indicated) shall comply with the provisions of Articles 2.2, 2.3 and 2.4. 2.2 The first color band shall be close to one end of the resistor, and the position and spacing of each color band shall be such that there is no confusion when reading the code. 2.3 Any additional code used shall not be confused with the code of resistance value and allowable deviation. 2.4 The various values ​​corresponding to the color code are shown in Table 1. Table 1 Values ​​corresponding to color codes
Significant digits
When expressing temperature coefficients according to the above color codes, one of the following methods should be used: Approved by the State Administration of Technical Supervision on December 7, 1994
Temperature coefficients
(10-/r:)
Implementation on August 1, 1995
GB/T2691-94
a) When it is the 6th color band, its width is 1.5 to 2 times that of other bands: b) When it is the 6th color band, its band is a broken band:) Spiral.
When using spiral bands for cylindrical resistors, the band should be selected on the existing resistance value and the length of the band indicated by the allowable shrinkage difference, and the spiral angle of the spiral band should not be less than 270°. For other types of resistors, similar methods using color codes should be in accordance with the provisions of detailed specifications. The color code marking of temperature coefficient is used only with three significant digits. 2.4.1 Example of color code marking for resistance value with two significant digits: A resistor with a resistance value of 270000 and an allowable deviation of ±5%: The first band
red 1st significant digit)
white 2.4.2 Example of color code marking for resistance value with three significant digits: A resistor with a resistance value of 2490000 and an allowable deviation of ±1%: The first significant digit is red, the third significant digit is white ... 5 to 2 times. 2.4.3 The color code for the resistance value with three significant digits and the requirement to mark the overflow coefficient is as follows: The resistance value is 249000Ω. The allowable deviation is ±1%. The temperature coefficient is ±50×10-/℃. The first color code is red (the third significant digit is the third significant digit, the fourth significant digit is the third significant digit, the fifth significant digit is the third significant digit, the sixth significant digit is the third significant digit, the seventh significant digit is the third significant digit, the eighth ... 2691--94
Note: To avoid any confusion, the last brown band indicating the coefficient of error should be expressed in one of 2.4), b),). 3 Letter and numeric codes for resistance and capacitance values ​​3.1 Overview
3.1.1 The code should be 3, 4 or 5 characters, i.e. 2 numbers and 1 letter, 3 numbers and 1 letter or 4 numbers and 1 letter, as required.
3.1.2 The letter codes shown in the examples in Tables 2 and 3 replace the decimal point. Table 2 Examples of resistance value code symbols
Resistance value
Code symbol
Resistance value
Code symbol
Battery value
GB/T 2691—94
Reinstall 2
Generator calcium mark
Note: When the resistance value is expressed with four effective digits, its mark is as follows: Resistance false
Electric medical value
Code mark
59K04, etc.
Capacitor most code mark example
.0. 15
Capacitor castle
Code mark
Code mark
GE/T 2691—94
Continued Table 3
Code Symbol
Note: When the capacitance is expressed by four significant figures, its symbol is as follows: Capacitance
Capacitance
Code Symbol
68n01, etc.,
Code Symbol
3.1.3 When the letter code or mathematical code is added after the letter of the allowable deviation specified in Article 4, the added letters and numbers should not be confused with the resistance value or the allowable deviation code.
3.2 Resistors
The letters R, K, M, G and T represent the multipliers of the resistance value 1, 10, 105, 10° and 101 respectively, and the unit of resistance value is ohm. 3.3 Capacitors
The letters p, Fm and F represent the multipliers of the capacitance 1012, 10-9, 106.10-* and 1 respectively, and the unit of capacitance is ohm. 4 Letter codes for tolerances of resistance and capacitance 4.1 Tolerances of symmetrical percentages
Tolerances of resistance and capacitance should be indicated by the following letters
These letters should be placed after the resistance and capacitance.
4.2 Tolerances of asymmetrical percentages
GB/T 2691-94
Tolerances of asymmetrical percentages should be indicated by the following letters: Tolerance
4.3 Tolerances of symmetrical fixed values ​​for capacitance below 10pF should be indicated by the following letters:
4.4 Other Tolerances
Tolerances for which no letter code is specified should be indicated by the letter A. When the letter A is used to indicate the tolerance, it should be identified in other documents. 5.1 Two-character code (year/month)
When the year and month of manufacture need to be marked, the following method should be used: year
Note: This whole code represents the year and is repeated every 20 years. Letter
Main code bZxz.net
GB/T 2691--94
December
Example: March 1985 = T3; November 1986 - UN, 5.2 Four-character code (year/week)
When the year and month of manufacture need to be marked, a four-digit code should be used. The first two digits are the last two digits of the year, and the following two digits are the number of the week. The numbering method of the week should comply with ISO Standard R2015: Week numbering. Example: Week 5 of 1985 = 8505.
GB/T 2691—94
Appendix A
Direct marking method
(Examination material)
A1 Direct marking method refers to the marking method of directly marking the main parameters of the product with Arabic numerals and units. A2
The decimal point should occupy the position of one digit. A3 The indirect marking method should not be mixed with other marking methods. A4
The units of the current value and capacitance should comply with the provisions of Table A1, and the allowable deviation is expressed in percentage. Table A1
Unit name
Kilohm
Megaohm
Example:
Unit name
Resistor with nominal resistance of 100n and allowable deviation of ±10% is marked as: 1000±10%
Capacitor with rated voltage of 16V and nominal capacitance of 100μF and allowable deviation of % is marked as: 16V100μF5%.
Additional remarks:
This standard was proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Standardization Research Institute of the Ministry of Electronics Industry. This standard was drafted by the Standardization Research Institute of the Ministry of Electronics Industry. The main drafter of this standard is Huo.
This standard was first issued in December 1981 and revised for the first time in December 1994.
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