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From: wtm@uhura.neoucom.EDU (Bill Mayhew)
Newsgroups: comp.sys.att
Subject: 3b1 thermal measurements
Message-ID: <1990Mar25.144248.10084@uhura.neoucom.EDU>
Date: 25 Mar 90 14:42:48 GMT
Organization: Northeastern Ohio Universities College of Medicine
Lines: 27

Put this in the "for what its worth" department.

I have a 2 meg 3b1 with a Miniscribe 6085 and a Voice Power board.
The room here at home where the 3b1 sits is regulated to 71 deg. F
with 50%  relative humidity.

I allowed the 3b1 to stabilize.  The outlet air temperature at the
fan grille is 90.7 deg. F.  I allowed the system to stabilize with
the monitor off, and the temperature read 88.1 deg. F.

I am considering measuring temperature rise under an assortment of
ambient conditions.  The thought I have is to build an external
safety deivce.  If the temperature at the fan grille isn't some
amount above ambient, the device could latch a relay open, cutting
power to the 3b1.   If the air flow stopped, the temperature just
outisde the fan grille probably be less than the customary rise
above ambient.  That $20US Radio Shack temperature monitoring
module comes to mind for use as a basis for such a project,  The
Radio shack module can be programmed to generate an alarm if the
temperature is outside a pre-set limit.

Bill
-- 

Bill Mayhew  Northeastern Ohio Universities College of Medicine
Rootstown, OH  44272-9995  USA    216-325-2511
wtm@uhura.neoucom.edu   ....!uunet!aablue!neoucom!wtm