[sdiy] how to tell metal film resistors?

[Neil Johnson]

On 28 April 2015 at 09:55, Roman Sowa <modular at go2.pl> wrote:
> It's not only tolerance of selecting values at factory, but the resistor
> must keep its resistance within specified tolerance when  considering aging
> and tempco. That's why there are no 0.1% resistors with tempco higher than
> 100ppm, but 25ppm is more common at that precision.
> And it's very rare to find a carbon resistor with tempco less than 100ppm.

Yes, of course.  And any decent designer would account for that.

What can also be important is the tolerance on that tempco, and how
closely two resistors from the same batch track each other.

Neil
(definitely wandering off topic now :-) )
--
http://www.njohnson.co.uk