[volt-nuts] Fluke 720a self calibration repair

[Bill Gold]

Charles:

    Mia Culpa!  I had the datasheet also but got caught by the description
that Allied used when I looked them up.  It showed "Cermet" but obviously
Allied & Mouser has these shown incorrectly.  Digikey shows these as
Wirewound.  How interesting.

I stand corrected.

Bill

----- Original Message ----- 
From: "Charles Steinmetz" <csteinmetz at yandex.com>
To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
Sent: Tuesday, September 29, 2015 8:46 AM
Subject: Re: [volt-nuts] Fluke 720a self calibration repair


> Bill wrote:
>
> >I just looked inside my 720A at the 20 turn 5K trimpots.  They are
> >Bourns 3005P-502 printed on them, cermets, standard 3/4", tempco 50 ppm.
> >      *   *   *   Not too sure where the idea of a wirewound pot
> > came from here.
>
> Perhaps from the Bourns 3005 DATASHEET I posted a couple of days ago.
>
> See <https://www.febo.com/pipermail/volt-nuts/2015-September/004504.html>
>
> >Digikey is $14.35 and Mouser is $14.35.  Wow!  Expensive little devils.
> >On the other hand (left) Digikey shows a unit from "TT Electronics/BI
> >Technologies" for $1.40 ea.  Interesting.  Why such a massive difference
in
> >price?
>
> Cermet ($1.40) vs wirewound ($14).
>
>
> Charles
>
>
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