I am not familiar with "vpg" or "vhd" terms. I assume the former is a company (European?) and the latter is a model type? Do you have a URL or other information to get followup information. The 0.1 ppm tracking is exactly what I am looking for and I don't need absolute accuracy.
Thanks, Randy On Fri, Jul 18, 2014 at 12:00 AM, <acb...@gmx.de> wrote: > randy, > re. vpg: they offer an hermetic divider (vhd) with typ. 0.1ppm tracking of > tempco. if you are ok with lowest available abs. accuracy it will be well > priced, I remember having asked them for a price and it was below 50€ for > standard lead time (which can be very long). it is also fair to assume it > would age more homogeneously than two separate resistors, also you dont > need to think about how to keep two resistors at the same temp. make sure > each resistor is loaded with less than 10mw, otherwise aging may be above > what the claim in their collateral. > > > > > Gesendet: Donnerstag, 17. Juli 2014 um 04:40 Uhr > > Von: "Frank Stellmach" <frank.stellm...@freenet.de> > > An: volt-nuts@febo.com > > Betreff: [volt-nuts] Matched resistors > > > > Randy, > > > > resistor matched in T.C. are extremely expensive, as the manufacturer > > (or yourself) would have to select these from a batch of many samples. > > > > reistors with very small T.C. (<1ppm/K) would do the job also, but they > > also need to be stable over time, in shelf life opereation mode, i.e. > > P<10mW. > > > > That means, you need those hermetically sealed VHP202Z from Vishay, T.C. > > is typically < 1ppm/K and they are stable to < 2ppm over 5years. But > > they cost already 80€ each, depending on tolerance. > > > > I made a longterm observation of these and found these parameters > confirmed. > > > > Frank > > _______________________________________________ > > volt-nuts mailing list -- volt-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.