[volt-nuts] Traveling Standards

[Andreas Jahn]

> I can't afford precision, low tempco resistors either. I would also use
> metal films, but I would ovenize as per your off-the-cuff, and HOPE the 
> heat
> blows off the humidity. I would build an aluminum plate "coffin" around 
> all
> components except the LTZ1000 (is it also position sensitive like 
> LM399s?),

Hello,

I do not think that you can get good results with standard metal film 
resistors.
Perhaps you can use them for the 70K-values but the current setting
and temperature setting resistors should be at least precision
wire wound types. (UPW50 or Riedon USR2).

the LTZ is much less position sensitive.
Frank measured around 1ppm for the LTZ in September 2010 in this list.
My measurement was around 0.3ppm in November 2011.
(tilting LTZ1000)
But the LTZ1000 is much more sensitive to common mode noise and RF.
So you have to take much more effort to shield and filter on a LTZ1000.

With best regards

Andreas