Nice ! haven't the curiosity of fast heating up to +60 C after that ?
The most problems comes after a large humidity variations which is
related to temperature change. ( even in climatic chambers )

regards, Vasile

On Tue, 22 Jan 2002, John Hansen wrote:

> Since Roman explored the high temperature end, I thought I would look into
> chilling the chip.  I used some quick freeze that is supposed to take the
> chip down to -45 C (I have no way to verify the actual temperature, but it
> got very very cold).   For this experiment I used a 16F628 (with the
> internal oscillator. )  The result was a decline in speed of about 2.8
> %.  9600 baud serial communication still worked fine, however I have a
> piezo speaker hooked up that beeps when a key is pressed and the pitch of
> the beep was slightly lower, as one might expect.    All of this makes me
> think seriously about doing away with the resonator in this project.
>
> John Hansen
>
>
> At 02:11 PM 1/22/2002 +1100, you wrote:
> >I did a VERY quick test with some 16c505 and internal
> >RC osc at 4MHz. Speed variation between chips was less
> >than 0.5%, and what surprised me was the difference
> >between 27'C and 40'C was only about 0.5% also!!
> >I only measured about 5 or 6 chips, and they were
> >from the same (recent) batch.
> >-Roman
> >
> >
> >Rudy Rudy wrote:
> > >
> > > If anyone tries this, please post your findings.  I am sure that many
> > > people here would love to know the outcome.
> > >
> > > Rudy
> > >
>
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