From: ELIZA (elizaw_at_aztec.asu.edu)
Date: Thu Jul 02 1998 - 22:25:56 EDT
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
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