The capacitance value of the nominal resistance of Origin

 
 

About capacitive resistance only know that there are some so-called typical values, contribute to the selection, do not know is how come these values. Today checked, only to find the so-called "E" specifications. "E" represents the "index distance" (Exponential Spacing), the tube 20 of the last century, the times, manufacturers of electronic components in order to facilitate the management and selection component specifications, resistors, standardized mass production requirements, but also to the resistance specifications without too much consultation adopted a unified standard value components of the composition. it is based on a set of error tolerance, and an exponential pitch standard. this standard has been widely adopted in the world, this series of It called nominal resistance value of the resistor.

The nominal resistance of the resistance divided E6, E12, E24, E48, E96, E192 six series, each adapted to allow a deviation of 20%, ± 10%, ± 5%, ± 2%, ± 1% and ± 0.5 % resistor. Wherein the number system used series E24, E48, E96, E192 series of high precision resistance coefficient

E6 series resistor nominal resistance corresponding tolerance is ± 20%, see Table E6 series resistance specifications.

E12 series resistor nominal resistance corresponding tolerance is ± 10%, see Table E12 series resistance specifications.

E24 series resistor nominal resistance corresponding tolerance is ± 5%, see Table E24 series resistance specifications.

E48 series resistor nominal resistance corresponding tolerance is ± 2%, see Table E48 series resistance specifications.

E96 series resistor nominal resistance corresponding tolerance is ± 1%, see Table E96 series resistance specifications.

E192 nominal resistance series resistor, corresponding to 0.5% tolerance of ±, ± 0.25%, ± 0.1% , see Table E192 series resistance specifications.

E6 series of nominal value only: 1.0,1.5,2.2,3.3,4.7,6.8. It represents a valid number of components must be selected from this series, specific values ​​can be enlarged or reduced to an integer multiple of 10. Significant figures such as 2.2, can be obtained amplified 220 ohms nominal value, can be reduced nominal 22 milli-ohms. Other family values ​​are as follows:

E12 Series: 1.0,1.2,1.5,1.8,2.2,2.7,3.3,3.9,4.7,5.6,6.8,8.2

E24 Series: 1.0,1.1,1.2,1.3,1.5,1.6,1.8,2.0,2.2,2.4,2.7,3.0,3.3,3.6,3.9,4.3,4.7,5.1,5.6,6.2,6.8,7.5,8.2,9.1

E48 Series: 1.00,1.05,1.10,1.15,1.21,1.27,1.33,1.40,1.47,1.54,1.62,1.69,1.78,1.87,1.91,1.96,2.05,2.15,2.26,2.37,2.49,2.61,2.74,2.80 , 2.87,3.01,3.16,3.32,3.48,3.57,3.65,3.83,4.02,4.22,4.42,4.64,4.87,5.11,5.36,5.62,5.90,6.19,6.34,6.49,6.81,7.15,7.50,7.87,8.25 , 8.66,9.09,9.53

E96 Series: 1.00,1.02,1.05,1.07,1.10,1.13,1.15,1.18,1.21,1.24,1.27,1.30,1.33,1.37,1.40,1.43,1.47,1.50,1.54,1.58,1.62,1.65,1.69,1.74 , 1.78,1.82,1.87,1.91,1.96,2.00,2.05,2.10,2.15,2.21,2.26,2.32,2.37,2.43,2.49,2.55,2.61,2.67,2.74,2.80,2.87,2.94,3.01,3.09,3.16 , 3.24,3.32,3.40,3.48,3.57,3.65,3.74,3.83,3.92,4.02,4.12,4.22,4.32,4.42,4.53,4.64,4.75,4.87,4.99,5.11,5.23,5.36,5.49,5.62,5.76 , 5.90,6.04,6.19,6.34,6.49,6.65,6.81,6.98,7.15,7.32,7.50,7.68,7.87,8.06,8.25,8.45,8.66,8.87,9.09,9.31,9.53,9.76

E192系列:1.00、1.01、1.02、1.03、1.04、1.05、1.06、1.07、1.09、1.10、1.11、1.13、1.14、1.15、1.17、1.18、1.20、1.21、1.23、1.24、1.26、1.27、1.29、1.30、1.32、1.33、1.35、1.37、1.38、1.40、1.42、1.43、1.45、1.47、1.49、1.50、1.52、1.54、1.56、1.58、1.60、1.62、1.64、1.65、1.67、1.69、1.72、1.74、1.76、1.78、1.80、1.82、1.84、1.87、1.89、1.91、1.93、1.96、1.98、2.00、2.03、2.05、2.08、2.10、2.13、2.15、2.18、2.21、2.23、2.26、2.29、2.32、2.34、2.37、2.40、2.43、2.46、2.49、2.52、2.55、2.58、2.61、2.64、2.67、2.71、2.74、2.77、2.80、2.84、2.87、2.91、2.94、2.98、3.01、3.05、3.09、3.12、3.16、3.20、3.24、3.28、3.32、3.36、3.40、3.44、3.48、3.52、3.57、3.61、3.65、3.70、3.74、3.79、3.83、3.88、3.97、4.02、4.07、4.12、4.17、4.22、4.27、4.32、4.37、4.42、4.48、4.53、4.59、4.64、4.70、4.75、4.81、4.87、4.93、4.99、5.05、5.11、5.17、5.23、5.30、5.36、5.42、5.49、5.56、5.62、5.69、5.76、5.83、5.90、5.97、6.04、6.12、6.19、6.26、6.34、6.42、6.49、6.57、6.65、6.73、6.81、6.90、6.98、7.06、7.15、7.23、7.32、7.41、7.50、7.59、7.68、7.77、7.87、7.96、8.06、8.16、8.25、8.35、8.45、8.56、8.66、8.76、8.87、8.98、9.09、9.20、9.31、9.42、9.53、9.65、9.76、9.88

E系列补充说明:

  E系列也是一种由几何级数构成的数列。E系列首先在英国的电工工业中应用,故采用Electricity的第一个字母E标志这一系列,它是以6√10、12√10 、24√10 为公比的几何级数,分别称为E6系列、E12系列和E24系列。(基本值见下表)。即:

E6系列的公比为6√10≈1.5

E12系列的公比为12√10≈1.2

E24系列的公比为24√10≈1.1

E48系列的公比为48√10≈1.05

E96系列的公比为96√10≈1.02

E192系列的公比为192√10≈1.01


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