Talk:Preferred number
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[edit] Resistor series
After calculating some numbers on my own, i must say some of these values seem messed up, for example in the capacitor / resistor E24 series, the 12th value is 30, but when calculating it (10*1011/24), you get 28,7, rounded 29.
Are these values incorrectly defined by ISO / IEC, or are they just wrong here in the Wikipedia? --Abdull 15:23, 19 Jun 2005 (UTC)
- I work in the industry and the numbers are right for E24 5% resistors. Your math is also right. Annoying isn't it? You should be able to re-create the series with a simple formula but you cannot. --Ee79 01:19, 13 October 2005 (UTC)
[edit] IEC standard IEC-63
According to one source, The E-series of preferred numbers are standardized in E-63. I'm not sure if the source is accurate, or of the standard has been updated and got a new number. http://www.elfa.se/se/fakta.pdf, page 43. --HelgeStenstrom 12:20, 20 November 2006 (UTC)
