Re: Capacitor with 105 degree celsius ?


"John Fields" <jfields@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:gjkd5112fk5577upjghkl1v8oe08n38p5p@xxxxxxxxxx
> On 8 Apr 2005 07:09:46 -0700, mowhoong@xxxxxxxxxxx (mowhoong) wrote:
>
> >Capacitor with a range of 105 Celsius & life 8000 hours? I am curious to
know
> >who will design a circuit put under such high temp. & only last for eight
thousend
> >hours, other component like plastic will also deform due to high temp.Do
you think
> >it make sense ? Can any person know the reason. Thanks.
>
> ---
> _Only_ 8000 hours? Downhole equipment is routinely expected to not
> only survive, but to work in environments in excess of 200°C, so that
> 2000 hours gets eaten up pretty quickly.
>
> --
> John Fields
> Professional Circuit Designer

Besides the heat of drilling, what is the temperature at say 4000 feet?


.

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