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E series

Discussion in 'General Electronics Discussion' started by dcac, Apr 20, 2015.

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  1. dcac

    dcac

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    Jul 10, 2013
    Hi

    does anyone know where is the magic behind the E series rounding?
    Some number correspond to Renard/geometric series other rounded up others are rounded down?

    for example 10^(6/12)=3.1623 in E12 this number corresponds to 3.3. Does anyone know how the rounding works?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Your reference to Renard series is a near hit. Read more here. The magic is in the tolerances such that within one series no gaps exist between adjacent numbers including the tolerances.
     
  3. dcac

    dcac

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    1
    Jul 10, 2013
    I guess the only way is to memorise the numbers because there are no easy way to calculate because of this tolerance they must to obey.
     
  4. davenn

    davenn Moderator

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    Sep 5, 2009
    and that is dead easy

    1, 1.2, 1.5, 1.8, 2.2, 2.7, 3.3, 3.9, 4.7, 5.6, 6.8, 8.2

    and times 10 for each step up the scale

    10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68, 82

    etc :)

    Dave
     
  5. BobK

    BobK

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    Jan 5, 2010
    Well, that is the E12 series, what about E96? :)

    Bob
     
  6. davenn

    davenn Moderator

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    Sep 5, 2009
    he was only asking about the E12 which is the common one ;)

    Even I have never bothered memorising any of the other series ... not worth the effort
     
  7. dcac

    dcac

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    Jul 10, 2013
    Yeah not worth, but my lecturer wants me to know, kinda annoying in the way
     
    Last edited: Apr 23, 2015
  8. davenn

    davenn Moderator

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    Sep 5, 2009
    well I gave you the E12 range as I said ... pretty easy to memorise :)
    have fun
     
  9. KJ6EAD

    KJ6EAD

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    Aug 13, 2011
    I almost have a complete E24 series at work and I almost have it memorized. :cool:
     
  10. davenn

    davenn Moderator

    13,617
    1,881
    Sep 5, 2009

    ohhh that take a little more effort :)
     
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