From: Bill Morrow (penzance_at_icanect.net)
Date: Fri Jul 03 1998 - 02:13:32 EDT
Last year there was an infrared photo taken of a TP, i THINK it was a
770, which showed the hot spots..
not sure of where or when.. :-)
ELIZA wrote:
> Here are some measurements of temperatures that relate to the
> heat generated by the IBM ThinkPad 770 (TP770-1AU model).
>
> ATTN: To be read using an equally spaced font such as courier.
>
> On a *very wise suggestion* from Paul Rubin (phr_at_netcom.com)
> [whom I thank for stimulating discussions during the experiment]
> the TP was located on a blanket (a thick layer of very good
> insulating material). This is a _worst case study_, temperatures
> previously measured using no blanket were about 10 to 20 deg F
> lower.
>
> setup:
> Probe distribution during the measurements
>
> +---------------------------------------+
> | |
> | blanket |
> | |
> | +-----------------------+ |
> | | | | |
> | | bp | |
> | | | |
> | | | |
> -ap| | TP770 | |
> | | | |
> | | | |
> | | fp | |
> | | | | |
> | +-----------------------+ |
> | |
> | tp |
> | | |
> +---------------------------------------+
>
> codes: ap = air probe, not exposed to the
> drafts from the air conditioner
> bp = back probe, inserted between
> the blanket and the TP770
> fp = front probe, also between the
> blanket and the TP770
> tp = table probe, inserted between
> the blanket and the table
> blanket = woolen blanket multiple
> folded to an area of 25 x 20 in,
> and total thickness 5 in.
> probe = thermocouple about 4 in long
> (referenced to a thermistor at
> room temperature in a digital
> multimeter)
>
> results:
> Figures are in degrees F measured
> at the probe locations
> -----------------------------------
> cpu load | bp | fp | ap | tp
> -----------------------------+-----
> nil 110 | |
> ------------------------+ |
> low 121 110 | 81 |
> ------------------------+ to | 92
> medium 125 | 84 |
> ------------------------+ |
> high 131 | |
> ------------------------+----+-----
> NOTE: in all cpu condtions, between
> 0.5 and 1 W were extracted from the
> mouse port to provide power for a
> radio tuner inputed to the TP770
> audio mixer and loudspeakers which
> thus were in use all the time.
> The machine was powered by its AC
> adaptor and in the UltraBay was the
> DVD drive.
>
> jc (Juan-Carlos Lerman)
>
> lists e-mail: elizaw_at_aztec.asu.edu
> personal e-mail: jclerm_at_aztec.asu.edu
-- Happy Trails... :-) ** Bill Morrow ** WEB PAGE: http://thinkpads.com DISCUSSION: http://thinkpads.com:8080/webboard/$webb.exe bill_at_nospam@thinkpads.com, morrow1_at_nospam@compuserve.com 770ED-5AU, 770-1AU(2), 760ED(1), 701C(2), 750C, IBM WorkPad Win95B & Win98-RC2
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