[volt-nuts] Matched resistors

[Andreas Jahn]

http://www.vishaypg.com/foil-resistors/list/product-63036/
http://www.vishaypg.com/doc?63036

Am 19.07.2014 06:07, schrieb Randy Evans:
> 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 <randyevans2688 at 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, <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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