[volt-nuts] Oven thermal insulation

[Chuck Harris]

Bear in mind that the common ordinary styrofoam cup
does just fine when containing boiling water.

Where it has problems is when it is in contact with
the heating elements, and they are allowed to overshoot
the desired temperature greatly.

The answer is to make sure that your heating element is
in good thermal contact with the metal oven, and not in
contact with your insulation... That, and don't get too
aggressive with the delta t component of your PID algorithm.

-Chuck Harris

Randy Evans wrote:
> Frank,
>
> I don't plan on operating at 80C. I just want an insulation that can
> withstand up to 80C so i have a safety margin.  45C is probably too low for
> my environment but 50C might be doable.
>
> Thanks,
>
> Randy
>
> On Tue, Jul 7, 2015 at 12:29 AM, Frank Stellmach <frank.stellmach at freenet.de
>> wrote:
>
>>
>> Hi Randy,
>>
>>
>> 80°C and 'highest stability' is simply a contradiction in itself.
>> Therefore, if you really go for highest stability, please run your voltage
>> reference at < 60°C only, best would be 45°C!
>>
>> In this case, ordinary styrofoam is suitable, higher temperatures require
>> poly sulfone, like used on the HP3458A reference board, or the VALOX(TM)
>> plastic which is used for the LM399.
>>
>> Frank