Bob Barr wrote :

> (Apologies if I've misattributed this to Olin)
> >Olin Lathrop wrote :
> >
> >> I've never heard of "E12" and "E24"...
> >
> >Is not that numbering system used everywhere ?
> >
> >http://www.logwell.com/tech/components/resistor_values.html
> >
>
> That's the first place that I've ever seen that "E" series of numbers
> used to indicate different precisions of resistors.

Yes, that's a bit confusing, they are not *directly* connected and are
not normaly specified that way.

But on the other hand, there would be no reason to produce 5% resistors
according to the E96 or E192 series, would there ? A number of
values would be overlapping within the tolerance limits.

And the absolutly highest (or lowest ?) tolerance resistors
(that is, with a very low %) are often not made according to
any of these tables, but in some "decade" (10, 20, 50, 100...) series.

> Could this "E" convention perhaps be more commonly used in Europe than
> in the U.S.?

Possibly, together with the "meter", the "kilogram" and other things
that makes life easy for everyone :-) :-)

But, seriously, it would surprice me a lot if not the resistors as sold
in the US, are according to the E-series numbering scheme.

Take one resistor pack at Digikey as an example.
The RS2X-ND, called "KIT RESISTOR 100-976 96 VALUES".
96 different values in one decade (100 ohms to 976 ohms), that's
obviously the E96 series, which is logical since this kit has 1%
metal film resistors.

Anyway, there is no reason, generaly, to use values from a "higher"
E-series, if a value from a lower series would work just as well.
It just makes it harder for anyone to find the "right" values...


Best Regards,
Jan-Erik.

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