[volt-nuts] Bls: How accurate is a fluke after 9 years

[acbern at gmx.de]

I have VPG hermetic foil resistors that drifted 0.2ppm/year (verified in cal lab). temp co. arround room temp <0,2ppm/k. my personal opinion, they are the best resistors for stability that you can purchse as a standard list item. Mine were < 40usd (4-wire, 0.1%, in reality they are better 0.01%). 2-wire types are probably cheaper.
you cannot use standard foil resistors, they drift due to humidity, some 10 ppm easily pa.
I would think Edward Petties do drift as well, most likely onsiderably more than the heremtic resistors, but probably less than vpg epoxy foil,(there is no drift spec against time from him), since his are not hermetic. And also, typically his temp drift is worse (1-3ppm/K versus <0,5).

Adrian

> Gesendet: Sonntag, 17. Mai 2015 um 03:40 Uhr
> Von: "Anton Moehammad via volt-nuts" <volt-nuts at febo.com>
> An: "Ken.Peek at DiligentMinds.com" <Ken.Peek at DiligentMinds.com>, "Discussion of precise voltage measurement" <volt-nuts at febo.com>
> Betreff: [volt-nuts] Bls:  How accurate is a fluke after 9 years
>
> Hi All,What about Edward G Pettis resistor are they include in *THAT ARE PROPERLY WELDED* 
>  
> 
> 
>      Pada Minggu, 17 Mei 2015 2:11, Ken Peek <ken.peek at diligentminds.com> menulis:
>    
> 
>  IMHO:  Vishay metal-foil resistors are very good, but *ONLY* if you get
> them in a hermetic package.  Depending on where you are in the world,
> this can be rather expensive [more or less].  Precision wire-wound
> resistors made with with low TCR Evanohm wire *THAT ARE PROPERLY WELDED*
> are the next best thing, and they don't cost you your first born...
> 
> 
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