![]() ![]() 2.2.1 E12 Series of Overlapping Tolerances The E24 Series The more accuracy (closer tolerance) needed in resistors chosen for a particular purpose, the more values must be in the range chosen (and generally the more expensive each resistor will be).įig. ![]() The E6 range has 6 values, and the E24 range 24 values per decade. Other ranges of resistors such as the E6 and E24 ranges cover wide ranges of values in a similar way and have tolerance values of 20% and 5% respectively. The E12 range with its 10% tolerance therefore has 12 values per decade. ![]() This range of values is called a decade, and the next higher range (decade) in the E12 series covers values between 90Ω (100Ω -10%) and 902Ω (820Ω +10%) and so on. The E12 series is so called because 12 ‘Preferred Values’ of resistor, each having a tolerance range of +/-10% covers all values from 10Ω to 100Ω. 2.2.1 shows how these tolerance ranges are used in the E12 series of resistors to cover (almost) all possible values of resistance between 10Ω and 100Ω. If a resistor of exactly 100KΩ is needed (an unusual situation) a resistor with the exact value can be selected from within this range or (more likely) a resistor with a closer tolerance can be used. Therefore there is no need to manufacture resistors with values between these upper and lower limits. Overlapping TolerancesĪ 100KΩ resistor having a +/-10% tolerance might be any value between 90KΩ and 110KΩ. Instead Resistors are made in a restricted range of values and each value is quoted as a specific number of ohms plus or minus a percentage of the quoted value, this range of possible values is called the tolerance of the resistor. Results should be interpreted to the nearest standard value when a quantization error appears.To manufacture resistors of every possible value would be impractical. Instead of using advanced Javascript functions that would make the script incompatible with older browsers, I elected
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