Hi Typical rule of thumb for a 1U is that under 10 watts - no problem at all / no issues. 10 to 20 watts - things get warm. Above 20 watts - you can't get away without a fan somewhere. In some cases that's a fan in the wall of the rack, but it's still a fan.
Bob On Mar 2, 2010, at 7:31 AM, Roy Phillips wrote: > Paul > I have a professionally manufactured Rb Frequency Standard which is a 19 inch > 1U rack mounted unit. It contains the Datum Rb. unit and a 24 volt, 2 amp. > linear PSU, plus two small interface PCB's. only. This is currently free > standing (not in a rack). After a while the 1U cabinet runs quite warm. > Could be worth bearing in mind. > Roy > > -------------------------------------------------- > From: "Paul Boven" <p.bo...@xs4all.nl> > Sent: Monday, March 01, 2010 11:09 PM > To: "Discussion of precise time and frequency measurement" > <time-nuts@febo.com> > Subject: Re: [time-nuts] Rack-mounting an LPRO? > >> Hi everyone, >> >> First of all, thank you all very much for the many reactions to my query. >> I'd like to clarify a few things (my original posting was a bit too terse, I >> guess). >> >> The LPRO-101 is 1.5" high, 3.7" deep and 5.0" wide. Its height makes it >> ideal to fit inside a 1U rack unit while laying on its baseplate, and the >> manual states it was designed to fit in 1U or 3U VME units. And I happen to >> have a 1U 19" rack enclosure that fits it very nicely, snug between the top >> and bottom cover. "LPRO" stands for 'Low Profile Rubidium Oscillator". >> >> But from many of your reactions, it seems that this proposed setup would >> lead to problems getting rid of the heat generated by the LPRO, and the >> enclosure's baseplate would not be sufficient for cooling. I particularly >> liked the heat-pipe solution that was suggested, but there would be not >> enough height in the 1U enclosure for such a system. There seem to exist >> heatpipes of only 500um thickness these days, but I have no idea where one >> could find one of those. >> >> Scott Mace replied that he has a 1U high Datum Rubidium unit, probably >> something like their Datum-8040 product, and it works fine for him. >> >> As I already have the LPRO, rack-unit and PSU, I will attempt to get this >> combination to work, but will clearly have to put much more effort into >> (passively) cooling things than anticipated. Thanks again for the input, and >> I'll let you know how things turn out in a few weeks. >> >> Regards, Paul Boven - 73 de PEaNUT >> >> _______________________________________________ >> 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. > > > _______________________________________________ > 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. > _______________________________________________ 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.
