[volt-nuts] Precision resistors

[Pete Lancashire]

Since R is quite tied to E, i found this paper to be quite interesting

... Pettis was also the resistor expert who worked with Bob Pease in his
last project trying to push the state of the art at the time for special
resistors needed on the project.
The invention of Evanohm ....

http://www.edn.com/design/analog/4427151/The-last-half-century--Wirewound-resistors-Part-one

http://www.edn.com/design/analog/4427940/1/The-last-half-century--Wirewound-resistors-Part-two





On Thu, Aug 6, 2015 at 1:44 PM, Richard Moore <richiem5683 at gmail.com> wrote:

> Check with Edwin Pettis at Ultrohm in Grand Junction, Co. H ewinds superb
> ww resistors using Evanohm wire with tempcos under 3ppm/degC, with 0.01%
> tolerance for around $14 each. I’ve bought some and have been extremely
> pleased. Don’t know the largest he can make or at what price…
>
> pettiseng at q.com
>
> Dick Moore
>
>
> > Message: 1
> > Date: Thu, 6 Aug 2015 16:25:54 +0100
> > From: "David C. Partridge" <david.partridge at perdrix.co.uk>
> > To: "'Discussion of precise voltage measurement'" <volt-nuts at febo.com>
> > Subject: [volt-nuts] Precision resistors
> > Message-ID: <5D9EFA13BAB94DCA901607C1EDEA4911 at APOLLO>
> > Content-Type: text/plain;     charset="UTF-8"
> >
> > Looking for a set of precision resistors for calibration purposes.
> >
> > I need the following values to calibrate the ohms ranges on my meters:
> >
> >       100
> >       1k
> >       2k
> >       10k
> >       20k
> >       100k
> >       200k
> >       1M
> >       2M
> >       10M
> >       20M
> >
> > The crucial factor isn't that they be *exactly* the values above, so I
> don't necessarily need 0.001% parts.  Low TCR is important, and I will need
> to know that actual values to 10ppm or better.
> >
> > I'm looking for suggestions on the best choice of parts and pricing?  I
> believe the Vishay HZ series may fit the bill for the lower values but they
> may be rather expensive.
> >
> > Regards,
> > David Partridge
>
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