[volt-nuts] (New to me) 3458A Trivia

John Phillips john.phillips0 at gmail.com
Tue Oct 30 16:07:10 UTC 2012


I think the main thing they do is age and screen.

On Tue, Oct 30, 2012 at 6:48 AM, Bill Gold <wpgold3637 at att.net> wrote:

> Speaking of the 03458-66529 reference board added to the HP 3458A by Fluke
> (before Fluke offered the 8508A), has anyone ever seen a schematic of that
> board or how Fluke could rate that reference at 2 ppm?  One person on this
> forum theorized that by lowering the operating temperature of the LTZ1000A
> to around 70 degrees C, which is what the LTC device specification note
> recommends, this might have what was done to achieve the better drift
> specification.  It was noted that HP was running the LTZ1000A at around 105
> degrees C which might accelerate the aging rate.  I lowered my references
> to around 70 C and they have seemed to be a little more stable when checked
> against the Fluke 732A DC Reference Standard.  But I never started a
> project to follow up on this theory.  Just another project to play with
> when I "get a round toit"
> Bill
> _______________________________________________
> volt-nuts mailing list -- volt-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
> and follow the instructions there.
>



-- 
John Phillips


More information about the volt-nuts mailing list