[time-nuts] capacitors for oven controller

[paul swed]

Charles
You had me worried there. My first guess was ceramic at the temperature
involved and for the years of service something may need. But you did
mention it in the end.
I think I have only ever seen ceramics in the ovens.
Regards
Paul.

On Mon, Sep 22, 2014 at 4:23 PM, Charles Steinmetz <csteinmetz at yandex.com>
wrote:

> Corby wrote:
>
>  I'm working to replicate an oven controller and the schematic I have
>> states to check the leakage resistance of the .01uf integration capacitor
>> at 50 degrees C.
>>    *   *   *
>> What would be considered good at that temperature and how would I measure
>> it?
>>
>
> If you CAN measure it, without extraordinary measures, it is probably not
> suitable.  Some bench DVMs (e.g., Fluke 8050A) have conductance ranges that
> measure very low conductances (high resistances).
>
>  Also what type capacitor to use? Polycarbonate???
>>
>
> Polycarbonate is very difficult to find these days.  Of today's common
> dielectrics, it's a split decision between PP (polypropylene) and PPS
> (polyphenylene sulfide).  PPS handles higher temperatures, but PP has
> better insulation resistance at elevated temperatures.  Another possibility
> would be PTFE, if one will physically fit.  Finally, a C0G (NP0) ceramic
> could be a good choice.
>
> Best regards,
>
> Charles
>
>
>
>
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