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The E series is a system of preferred numbers (also called preferred values) derived for use in electronic components. It consists of the E3 , E6 , E12 , E24 , E48 , E96 and E192 series, [ 1 ] where the number after the 'E' designates the quantity of logarithmic value "steps" per decade .
Originally meant also as part marking code, this shorthand notation is widely used in electrical engineering to denote the values of resistors and capacitors in circuit diagrams and in the production of electronic circuits (for example in bills of material and in silk screens).
A 2.26 kΩ, 1%-precision resistor with 5 color bands (), from top, 2-2-6-1-1; the last two brown bands indicate the multiplier (×10) and the tolerance (1%).. An electronic color code or electronic colour code (see spelling differences) is used to indicate the values or ratings of electronic components, usually for resistors, but also for capacitors, inductors, diodes and others.
In applications for which the R5 series provides a too fine graduation, the 1–2–5 series is sometimes used as a cruder alternative. It is effectively an E3 series rounded to one significant digit: … 0.1 0.2 0.5 1 2 5 10 20 50 100 200 500 1000 … This series covers a decade (1:10 ratio) in three steps. Adjacent values differ by factors 2 ...
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The percentage of allowed deviation of the measured capacitance from the rated value is called the capacitance tolerance. Electrolytic capacitors are available in different tolerance series, whose values are specified in the E series specified in IEC 60063. For abbreviated marking in tight spaces, a letter code for each tolerance is specified ...
This graph shows how almost any value between 1 and 10 is within ±10% of an E12 series value, and its difference from the ideal value in a geometric sequence. Dutch Deze grafiek toont hoe de waarden uit de E12-reeks (met een tolerantie van 10%) een (nagenoeg) volledige dekking van één decade (1-10) geven.
English: Shows the tolerance, offset and overlap of all values in the E12 series of preferred numbers in relation to an ideal range of 12 values on a logarithmic axis. Svenska: Visar toleranser och avvikelser i E12-serien i förhållande till en ideal placering av 12 värden på en logaritmisk axel.