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 [email protected]:
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" <[email protected]>
An: "[email protected]" <[email protected]>, "Discussion of precise
voltage measurement" <[email protected]>
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 <[email protected]>
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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