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

[Anton Moehammad]

Hi All,
in the Vishay web I found "a better in spec" resistor than  vha512, could somebody give a comment ? 
http://www.vishaypg.com/docs/63120/hzseries.pdfThey also offer non standard value, anybody has experience in Vishay non standard value ?

Thank You




     Pada Senin, 18 Mei 2015 3:25, "acbern at gmx.de" <acbern at gmx.de> menulis:
   

 hi andreas,

yes, it was a vha512 (maybe 516, but dont think so, dont have data handy). I ordered it from their berlin area based distributor (powertron). I ordered a couple, but different values, so it was single piece price. was some time ago, so price may have increased by now.

adrian



> Gesendet: Sonntag, 17. Mai 2015 um 22:00 Uhr
> Von: "Andreas Jahn" <Andreas_-_Jahn at t-online.de>
> An: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
> Betreff: Re: [volt-nuts] Bls:  How accurate is a fluke after 9 years
>
> Hello Adrian,
> 
> which actual type of resistor did you use.
> And from where did you order it?
> For which quantity is the 40 usd price? (single piece?)
> 
> I guess it was one of the hzseries of vishay. right?
> Perhaps a Y4725 (VHA512Z?)
> http://www.vishaypg.com/docs/63120/hzseries.pdf
> Was it including PMO?
> 
> With best regards
> 
> Andreas
> 
> Am 17.05.2015 um 18:16 schrieb 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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