The telecom closets and data centers I've visited have a significant amount of airflow. Could it be that there is an assumption that these telecom-rack GPSDO expect some level of air?
/tvb ----- Original Message ----- From: <[email protected]> To: <[email protected]> Sent: Tuesday, December 11, 2012 5:20 PM Subject: Re: [time-nuts] Z3805A cooling requirements? > Stu, > > a fan is about the worst thing you can do for your Z3805 it will > significantly worsen the stability of the output frequency. The oven inside > does get > warm, that's why it is an oven :) > > The power consumption will go down once it heats itself up, the unit is > designed to work without a fan sitting on a desk etc. Just make sure the vent > > holes are not clogged. > > Sounds like your Z3816 had a failure that caused the units power supply to > overheat. > > bye, > Said > > > In a message dated 12/11/2012 16:22:10 Pacific Standard Time, > [email protected] writes: > > This may be a newbie question, but I'm a newbie, so: > > Do the HP telecom GPSDOs (Z38xx) require external airflow for cooling? > They don't have built-in fans, but they sorta look like they depend on a > rack-level cooling fan, which a telecom rack would almost certainly have. > > I ask because I bought a Z3816 awhile back which worked for about a week > and then failed. I traced the failure to an internal power supply brick, > which had a big finned heat-sink attached but nevertheless smelled > overheated and was shorted internally. > > I never found a replacement power brick, and I don't have time to mess with > it right now, so I recently bought a Z3805A. It, too, looks like it's > working, but it started to feel awfully warm after a few hours, so I > unplugged it for now. > > It probably wouldn't take much of a fan to bring the internal temperature > down close to ambient, and the fan could be powered easily enough from the > supply rails. But that might create a temperature gradient where the > designers didn't intend one. Or it might cause problems I don't even know > about yet. > > At the moment, the Z3805A is in a fan-less 19-inch rack with a bunch of > other equipment, in a lab environment. Should it have its own fan? > > Cheers! > --Stu > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
