[volt-nuts] Traveling Standards

[John Ackermann N8UR]

Just a quick off-the-cuff thought: has anyone considered building a 
voltage reference into the oven of a deceased OCXO?  That would give you 
a very stable thermal environment for very little work.

John
----

On 8/25/2011 1:14 PM, Bob Smither wrote:
> Fellow voltage aficionados ,
>
> If this has already been discussed - my apologies. I could not find this
> topic in the past several months of list archives.
>
> Like many of us, I have an ever growing collection of voltmeters and
> related instruments. Like the man with two clocks who is never sure of
> the time, I now have enough volt meters to have doubts about all of them.
>
> So - I was wondering if those on this list with really good voltage
> measurement capabilities would be willing to help those of us without.
>
> What I have in mind is creating a small voltage reference circuit based
> on one of the many available IC references that is stable enough in both
> time and temperature to use as a transfer standard. I am thinking that
> the actual voltage is not important, just the stability. Using the ICs
> that I am familiar with the actual reference voltage would be around 5,
> 7, or 10 volts. Said reference would be mailed to a willing list member
> who would record his reading of the reference and mail it back.
>
> I don't have such a reference yet, but have breadboarded a couple and
> the idea seems like it might work.
>
> My first objective would be to obtain a reference that I could use to
> get all my meters to agree. Since the best meters I have are an HP3455A
> (best accuracy about 20 - 40 ppm, and only for 24 hours) and an ancient
> (but very usable) Fluke 883AB (best accuracy is 100ppm), I would be very
> happy to have a reference that I could trust to 10ppm.
>
> So - two questions for the list:
>
> 1. Does this sound feasible? Am I overlooking anything that would keep
> me from being able to transfer a 10ppm known reference?
>
> 2. Any list members that would be willing to help with this? I envision
> mailing a small package with the reference in it along with an enclosed,
> postage paid, return box. I am asking for a member that would take the
> reference, apply power, let it warm up, record the room temperature and
> the reference voltage to within 10ppm, and return it to me. If you
> prefer to respond off-list - smither at c-c-i.com.
>
> BTW - I live in Friendswood, Texas (near Houston). Any fellow nutters
> close enough that I could hand deliver the reference?
>
> Best regards,
>
> Bob Smither
>
>
>
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