Re: cold resistors

[Clarence Bennett <bennett@OAKLAND.EDU>]

> Brian McInnes wrote:
>
> > ... What worries me is the large difference in precision
> > between the initial, mostly 1-digit, data and the 4,3, and
> > 2 digit coefficients that come out of the number-crunching.
>
> For a very large number of randomly selected resistors (not
> a case here) this would be justifiable. Individual fluctuations
> would cancel out and the precision of parameters would
> improve.

If you take a large sample of 20% resistors, most of them will be more than
10% high or low.

The 10% and 5% units are made in the same batch, but are selected out
before labelling.





Clarence Bennett
Oakland University
Rochester, Michigan 48309
248 370 3418
http://www.acs.oakland.edu/physics/staff_info/Bennett.htm