[volt-nuts] 3458A reference boards on ebay

[Tony Holt]

> Orin,
>
> What do you intend doing with it?
>
> I was thinking about getting one of those, with a view to putting it
> in a box with a couple of terminals to have something to compare with
> my 6.5 digit 3457A.  But what put me off is a lack of knowledge in
> knowing how to convert a 3458A reference board into a boxed unit with
> a known output voltage at the terminals. How would I avoid / control
> thermal EMFs?
>
> I'd be interested to hear what your plans are for it, and how you
> intend tackling those issues.
>
> Do you know what the difference in the reference is between a standard
> 3458A (8 ppm) and the high stability option 002 (4 ppm) model? I'm
> guessing the chips for the option 002 might be the top performing
> ones. I wonder if there's any way to tell from your board if it came
> from a standard 3458A or a 3458A with option 002.
>
> Dave

Take a look at this site for some good info on using the 3458A reference:

http://www.maxmcarter.com/vref/

Tony H