I figured out that VPG is Vishay Precision Group but I have not managed to identify the vhd hermetic divider. Could you point me to the location on the Vishay web site?
Thanks, Randy On Fri, Jul 18, 2014 at 9:00 PM, Randy Evans <randyevans2...@gmail.com> wrote: > 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.