Talk:E series of preferred numbers

Electronics Low‑importance

	Electronics portal This article is part of WikiProject Electronics, an attempt to provide a standard approach to writing articles about electronics on Wikipedia. If you would like to participate, you can choose to edit the article attached to this page, or visit the project page, where you can join the project and see a list of open tasks. Leave messages at the project talk pageElectronicsWikipedia:WikiProject ElectronicsTemplate:WikiProject Electronicselectronic
Low	This article has been rated as Low-importance on the project's importance scale.

Request for historical documents and E1 series

If any one has links to old historical standards for component values prior to 1952, please post a link or expand the history section. Thanks in advance. • Sbmeirow • Talk • 09:34, 11 July 2017 (UTC)[reply]

I have commented out the "E1" series (if it ever existed), since I could not find any historical sources for it (and I never heard of it before).

--Matthiaspaul (talk) 14:30, 1 November 2017 (UTC)[reply]

Does anyone have links or access to IEC 63 1952, 1963, 1967, 1977; or IEC 60063 2015 documents; or earlier documents from 1948 to 1952; so we can validate if E1 series had ever existed.

E1 is shown on page 2 of this PDF file, but this isn't an official standards source.

Everyone is welcome to help! Thanks in advance. • Sbmeirow • Talk • 19:49, 13 November 2019 (UTC)[reply]

I have a couple of older books here.

One is Radio Components Handbook © 1948. In it is a chart titled Composition) Preferred Resistors (Fixed with a list of 24 values, and dots to correlate which are 5%, 10%, and 20%. The chart looks suspiciously like E24, but is not tagged as E anything. It says they can be multiplied by any power of 10 up thru 20 megohms.

The other book is Reference Data For Radio Engineers © 1946. It contains two pages (landscape) of a 3 column chart showing cross-reference between Preferred Values of Resistance (20%, 10%, 5%), a column for Old Standard Resistance Values (which appear to be 50, 75, then multiples of 50, then 100, then 1000), then a column for Resistance Designation (which is the three color scheme to designate each of the previous two columnar values). The 5% values look like the E24 numbers, but I'm not seeing any designation of E anything. Another chart about color codes mentions a 1938 RMA Standard.

Hope this helps.

Cosmicray (talk) 01:20, 3 December 2024 (UTC)[reply]

Article renaming

Please quit renaming the article. Discuss it the talk section, settle on something, then change it. • Sbmeirow • Talk • 03:37, 25 July 2018 (UTC)[reply]

OK, yes, that would have been better. But I took the discussion instead to User talk:Matthiaspaul#E series where we worked it out. If you disagree, let us know. Dicklyon (talk) 05:28, 25 July 2018 (UTC)[reply]

Rounding Rules

The article is mentioning that E24 and below are using different rounding rules than E48 and above. But there are no references, links or other hint to what these rules are or where they are defined. This is problematic, for people trying to implement this algorithmically without having to resort to lookup tables. Please add rounding references if you know it. Jahibadkaret (talk) 13:22, 23 April 2019 (UTC)[reply]

Done. I added the formula. • Sbmeirow • Talk • 21:05, 13 November 2019 (UTC)[reply]

Reason for using letter E in series name?

Does someone have reliable information in regard to the reason for using the letter "E" in the name of these series? While I can guess several possible reasons, I would like to see this tracked down reliably (and then discussed in the article). --Matthiaspaul (talk) 12:23, 6 January 2020 (UTC)[reply]

I'm sure that in an early Practical Electronics issue it was mentioned it is E for Electronics. I'll have to dig through my archives to find the reference. — Preceding unsigned comment added by 208.127.199.228 (talk) 10:48, 19 October 2020 (UTC)[reply]

"E384" listed at Redirects for discussion

A discussion is taking place to address the redirect E384. The discussion will occur at Wikipedia:Redirects for discussion/Log/2020 July 9#E384 until a consensus is reached, and readers of this page are welcome to contribute to the discussion. 1234qwer1234qwer4 (talk) 11:42, 9 July 2020 (UTC)[reply]

you can use this if you like

E3 - E24

E3 (>20%)

E6 (20%)

E12 (10%)

E24 (5%)

1,0 2,2 4,7

1,0 1,5 2,2 3,3 4,7 6,8

1,0 1,2 1,5 1,8 2,2 2,7 3,3 3,9 4,7 5,6 6,8 8,2

1,0 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 4,7 5,1 5,6 6,2 6,8 7,5 8,2 9,1

E48 - E192

E48 (2%)

E96 (1%)

E192 (0,5%)

1,00 1,05 1,10 1,15 1,21 1,27 1,33 1,40 1,47 1,54 1,62 1,69 1,78 1,87 1,96 2,05 2,15 2,26 2,37 2,49 2,61 2,74 2,87 3,01 3,16 3,32 3,48 3,65 3,83 4,02 4,22 4,42 4,64 4,87 5,11 5,36 5,62 5,90 6,19 6,49 6,81 7,15 7,50 7,87 8,25 8,66 9,09 9,53

1,00 1,02 1,05 1,07 1,10 1,13 1,15 1,18 1,21 1,24 1,27 1,30 1,33 1,37 1,40 1,43 1,47 1,50 1,54 1,58 1,62 1,65 1,69 1,74 1,78 1,82 1,87 1,91 1,96 2,00 2,05 2,10 2,15 2,21 2,26 2,32 2,37 2,43 2,49 2,55 2,61 2,67 2,74 2,80 2,87 2,94 3,01 3,09 3,16 3,24 3,32 3,40 3,48 3,57 3,65 3,74 3,83 3,92 4,02 4,12 4,22 4,32 4,42 4,53 4,64 4,75 4,87 4,99 5,11 5,23 5,36 5,49 5,62 5,76 5,90 6,04 6,19 6,34 6,49 6,65 6,81 6,98 7,15 7,32 7,50 7,68 7,87 8,06 8,25 8,45 8,66 8,87 9,09 9,31 9,53 9,76

1,00 1,01 1,02 1,04 1,05 1,06 1,07 1,09 1,10 1,11 1,13 1,14 1,15 1,17 1,18 1,20 1,21 1,23 1,24 1,26 1,27 1,29 1,30 1,32 1,33 1,35 1,37 1,38 1,40 1,42 1,43 1,45 1,47 1,49 1,50 1,52 1,54 1,56 1,58 1,60 1,62 1,64 1,65 1,67 1,69 1,72 1,74 1,76 1,78 1,80 1,82 1,84 1,87 1,89 1,91 1,93 1,96 1,98 2,00 2,03 2,05 2,08 2,10 2,13 2,15 2,18 2,21 2,23 2,26 2,29 2,32 2,34 2,37 2,40 2,43 2,46 2,49 2,52 2,55 2,58 2,61 2,64 2,67 2,71 2,74 2,77 2,80 2,84 2,87 2,91 2,94 2,98 3,01 3,05 3,09 3,12 3,16 3,20 3,24 3,28 3,32 3,36 3,40 3,44 3,48 3,52 3,57 3,61 3,65 3,70 3,74 3,79 3,83 3,88 3,92 3,97 4,02 4,07 4,12 4,17 4,22 4,27 4,32 4,37 4,42 4,48 4,53 4,59 4,64 4,70 4,75 4,81 4,87 4,93 4,99 5,05 5,11 5,17 5,23 5,30 5,36 5,42 5,49 5,56 5,62 5,69 5,76 5,83 5,90 5,97 6,04 6,12 6,19 6,26 6,34 6,42 6,49 6,57 6,65 6,73 6,81 6,90 6,98 7,06 7,15 7,23 7,32 7,41 7,50 7,59 7,68 7,77 7,87 7,96 8,06 8,16 8,25 8,35 8,45 8,56 8,66 8,76 8,87 8,98 9,09 9,20 9,31 9,42 9,53 9,65 9,76 9,88

User:ARTol 12:39, May 26, 2023‎

I don't understand why it should be used, because readers would be forced to use a horizontal scroll bar to see all of the values. • Sbmeirow • Talk • 21:07, 26 May 2023 (UTC)[reply]

It is more compact and fits on one page. ARTol (talk) 21:13, 26 May 2023 (UTC)[reply]

Why not R Series?

Any idea why this series was established for some electronics parts, while others use the Renard series? ◅ Sebastian 00:02, 19 October 2023 (UTC)[reply]

Lots of calculated values don't align with the series

Examples:

Third Resistor in E3 $=\mathrm {round} ({\sqrt[{3}]{10^{2}}})=\mathrm {round} (4.6416)=4.6$ and not $4.7$ .
Fourth Resistor in E6 $=\mathrm {round} ({\sqrt[{6}]{10^{3}}})=\mathrm {round} (3.1623)=3.2$ and not $3.3$ .
Fith Resistor in E6 $=\mathrm {round} ({\sqrt[{6}]{10^{4}}})=\mathrm {round} (4.6416)=4.6$ and not $4.7$ .

However this isn't mentioned in the article. E6isnotrounded (talk) 17:00, 18 April 2024 (UTC)[reply]

You are incorrect, E3 / E6 / E12 are subsets of the E24 group, per E_series_of_preferred_numbers#E24_subsets. I'll try to clarify it to make it more obvious. • Sbmeirow • Talk • 18:00, 18 April 2024 (UTC)[reply]

Done • Sbmeirow • Talk • 23:50, 20 April 2024 (UTC)[reply]