[volt-nuts] Matched resistors

[Randy Evans]

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, <acbern at 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.stellmach at freenet.de>
> > An: volt-nuts at 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
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