3b1 thermal measurements
Bill Mayhew
wtm at uhura.neoucom.EDU
Mon Mar 26 00:42:48 AEST 1990
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 at uhura.neoucom.edu ....!uunet!aablue!neoucom!wtm
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