Benevolent, no mind, righteous, people way too. - Mencius
"E" represents the "index distance" (Exponential Spacing)
In the last tube era of the 20th century, electronic components manufacturers in order to facilitate the management and selection component specifications, standardized mass production in line with the requirements of resistance, but also to the specification without too much resistance, negotiation is a unified standard components component values.
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 is called the 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 deviation of ± 20%, ± 10%, ± 5%, ± 2%, ± 1% and ± 0.5% resistors. 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 series resistor nominal resistance corresponding to a tolerance of ± 0.5%, ± 0.25%, ± 0.1%, see Table E192 series resistance specifications.
E6 series resistance specifications
E represents the mean interval index, 6 represents only 6 kinds of digital series
E6 series resistor grid error is very large, the provisions of the basic number six: 1,1.5,2.2,3.3,4.7,6.8
| E6 series of values |
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| The basic values |
Tolerance |
Explanation |
| 1.0 |
±20% |
Using the lesser resistance |
| 1.5 |
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| 2.2 |
||
| 3.3 |
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| 4.7 |
||
| 6.8 |
||
E6 is a common ratio coefficient 6
Several series resistance of a predetermined basic coefficients, these coefficients multiplied by (wherein n is an integer), i.e. a specific resistor values.
As × 10 for 1.5 . 1 = 15 [Omega]
Due to large error resistance less used, with some more capacitance can be used for this series of resistors, capacitors, potentiometers, inductors.
E12 series resistance specifications
E represents the mean interval index, 12 represent only 12 digital series
E12 series of resistive grid error is large, the predetermined number of substantially 12:
| E12 series of values |
||
| The basic values |
Tolerance |
Explanation |
| 1.0 |
±10% |
Sometimes used |
| 1.2 |
||
| 1.5 |
||
| 1.8 |
||
| 2.2 |
||
| 2.7 |
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| 3.3 |
||
| 3.9 |
||
| 4.7 |
||
| 5.6 |
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| 6.8 |
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| 8.2 |
||
E12 common ratio coefficient is 12√10≈1.21
Several series resistance of a predetermined basic coefficients, these coefficients multiplied by 10 ^ n (where n is an integer), i.e. a specific resistor values.
The 10 × 1.2 . 1 = 12 [Omega]
Error is greater, less used, it can be used for this series of resistors, capacitors, potentiometers, inductors, etc.
E24 series resistance specifications
E represents the mean interval index, 24 represents the 24 species digital series
E24 series resistance errors moderate size, a predetermined number of base 24, such specifications most commonly used in the resistance:
| E24 series of values |
||
| The basic values |
Tolerance |
Explanation |
| 1.0 |
±10% |
Sometimes used |
| 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 |
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| 4.7 |
||
| 5.1 |
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| 5.6 |
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| 6.2 |
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| 6.8 |
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| 7.5 |
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| 8.2 |
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| 9.1 |
||
E24 is a common ratio coefficient 24 √10 = 1.1007≈1.1
Several series resistance of a predetermined basic coefficients, these coefficients multiplied by 10 ^ n (where n is an integer), i.e. a specific resistor values.
The 1.1 × 10 ^ 1 = 11Ω
Error is, the fixed resistor is widely used in
This series can be used for resistors, capacitors, potentiometers, inductors, etc.
E48 series resistance specifications
E represents the mean interval index, 48 represents the 48 species digital series
E48 series of resistive grid moderate error, the predetermined base number 48, such specifications most commonly used in the resistance:
E48 series resistance spec sheet just fine on their own inquiries.
E48 is a common ratio coefficient 48 √10 = 1.0491≈1.05
Series resistor 48 substantially predetermined coefficients, these coefficients multiplied by 10 ^ n (where n is an integer), i.e. a specific resistor values.
The 1.1 × 10 ^ 1 = 11Ω
Error is small, the application of more fixed resistors, used in the case of higher precision.
Used for this series of resistors, potentiometers
E96 series resistance specifications
E represents the mean interval index, there are 96 kinds of numbers represents 96 Series
E96 series of resistive grid error is small, there are 96 basic numbers, high accuracy such specifications commonly required where
E96 series resistance specification sheet own inquiries.
E96数系的公比为96 √10 = 1.024275≈1.025
系列的电阻规定96个基本系数，这些系数再乘以10^n(其中n为整数)，即为某一具体电阻器阻值。
如 100×10^1=1KΩ
误差较小，主要在固定电阻中应用较多，常用在精度要求较高的场合。
此系列一般用于电阻器。
E192系列电阻规格
E代表指数间隔的意思，E192系列有192种数字
E192系列的电阻格误差很小，有192个基本数，有±0.5%,±0.2%,±0.1% 3种精度，此种规格精度高成本也不会低，多用于对精度有较高要求的场合和部位。
E192系列电阻规格表，有3种精度级别
E192数系的公比为192 √10 ≈1.012
E192系列的电阻规定192个基本系数，这些系数再乘以10^n(其中n为整数)，即为某一具体电阻器阻值。
如 100×10^1=1KΩ
误差很小，主要在固定电阻中应用，用在精度要求较高的场合。[1]
最后总结一句话：我们市面上常用的就是E24系列的。
[1]摘自https://wenku.baidu.com/view/c3c50b10b307e87100f6963f.html