Messages in this thread | | | From | "Albert D. Cahalan" <> | Subject | Re: temperature standard - global config option? | Date | Fri, 8 Jun 2001 23:52:07 -0400 (EDT) |
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John Chris Wren writes:
> coupling to the CPU that is about as bad as it can get. You've got an epoxy > housing of an inconsistent shape in contact with ceramic. The actual > contact point is miniscule. There's no thermal paste, and often, I've seen > the sensors not quite raised high enough to contact the chip (you should be > able to rack a business card across the empty socket and feel a slight > "bump" as you touch the sensor. If not, you need to bend it up slightly, to > give better physical contact to the CPU). > > But in spite of all this, you're not really measure the critical > temperature, which is junction tempature. Yes, case tempature has *some*
There are processors with temperature measurement built right into the silicon.
> For the record, in the course of a normal day, I see my temperatures > fluctuate from 48C with the house A/C set to 73, to 56C when I open the > doors, and let it get up to 76 in the house. That's 8C (14.4F) over a 3F > change in ambient.
This makes sense. Heat increases resistance, which generates heat. At some point, a tiny increase will cause thermal run-away.
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