At 4:10 PM +0000 3/10/10, Mark Sims wrote:
Yes, I replace the standard HP fan with a MUCH quieter one. I get
mine from a local surplus shop. It is made by AAVID. it draws 120
mA at 12V and I run it off the 10V supply (which is somewhat over
10V).
Before getting all whiny about overheating, careful HP engineers
putting that obnoxious hurricane in for a reason, etc... know that
I put several thermocouples all over the guts of the machine and
found no significant changes in cooling. I have had modified
machines running continuously for many years.
It's reasonable to assume that HP engineers put in twice as much fan
as needed by 95% of their customers, to prevent problems with that
last 5% that run the thing in an extreme environment. If the
counter's spec sheet says it will run at 50C, then it's gotta be able
to run for a couple years at 50C without failure. So your 25C office
can use a much quieter fan.
Our telescope at 3500m altitude, on the other hand, needs all the fan
noise it can get since the thin air is only 50% as effective at
cooling as sea-level air is.
--
--David Forbes, Tucson, AZ
http://www.cathodecorner.com/
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
