[volt-nuts] Traveling Standards - pictures

[Bob Smither]

Fred Schneider wrote:
> Bob, Is it not better to let it age a bit befor it starts its journey
> ? I have build several standards a few months ago. I have not used
> them since but then I meaured them during two weeks or so and
> yesterday I put them on again. They still are not perfect stable. The
> short time drift took a day or two to get smaller but the long time
> drift still is not perfect. ( i am talking about 40-60 uV for a 1V
> and a 2.5 V standard.)
> 
> Also test it mechanical. See if it reacts on shocks, temp differences
> ect.

Thanks Fred.  Both references (the LM119AH and the MAX6350) have several 
hundred hours on them.  I have left them on for all the time since I put 
together the first bread board.  When I was not working on them, they 
have been powered.  They will accumulate an additional hundred hours or 
so before I actually ship them.

I will do some mechanical tests as well.  The last thing I want to do is 
"cook" the TS for a day or so at perhaps 100C and then see what has changed.

Thanks for the suggestions.

-- 
Bob Smither, PhD                                 Circuit Concepts, Inc.
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