[volt-nuts] Fluke 720a self calibration repair

Charles Steinmetz csteinmetz at yandex.com
Tue Sep 29 11:46:48 EDT 2015


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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