[volt-nuts] Traveling Standards - pictures

[Fred Schneider]

Ok, i did not know. I used brand new references. Do not cook them, they do not taste well ;-)
I mean more the shocks from transport, the mechanical stress. Or pack the TS in a soft foam box in that case the shocks will be absorbt.
Nice build in that tube by the way.

Fred PA4TIM

Op 6 sep. 2011 om 20:59 heeft Bob Smither <smither at c-c-i.com> het volgende geschreven:

> 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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