Odp: [sdiy] really basic question .. tolerance

[Roman Sowa]

Some resistor manufacturers claim that every resistor going onto
the reel is measured. This way it's easy to guarantee that all
resistors on that reel fit within given tolerance.
This way they probably select 1% and 0.5% from the same
production run I guess.
OTOH if others don't measure every resistors before packing
they can only guarantee some statistical parameter like "2-sigma
or whatever" depending on stability of manufacturing process.

I never worked in resistor fab, I just assume that reading
datasheets.
Yeah, I'm so geekily twisted I even read resistor's datasheet

Roman

----- Original Message -----
From: Ian Fritz <ijfritz at earthlink.net>
To: harrybissell <harrybissell at prodigy.net>; John L Marshall
<john.l.marshall at gte.net>
Cc: diysynth <diy_list at analog-synth.de>; <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, January 19, 2003 12:59 AM
Subject: Re: [sdiy] really basic question .. tolerance


> Um ... I still have a question.
>
> When I buy a 1% resistor is its value guaranteed to be within 1%, or is it
> just that some point on the statistical distribution ( the 2-sigma point or
> whatever) is at 1%?
>
> I've always assumed the former, but is
> this correct?
>
>    Ian
>
>
> At 04:34 PM 1/18/2003, harrybissell wrote:
> >Yep... I'm in
> >
> >H^) harry
> >
> >John L Marshall wrote:
> >
> > > We all agree. I think.
> > >
> > > Take care,
> > > John
> > > www.sound-photo.com
>