Hi Another option for cooling the LPRO would be a fan in combination with a heat sink.. That's not my favorite way to go, but it should take care of the cooling.
Bob On Feb 27, 2010, at 6:51 PM, Bruce Griffiths wrote: > For operation at ambient temperatures up to 50C the manual states that a > baseplate heatsink with a thermal resistance of 2C/W or lower is required. > > Bruce > > paul swed wrote: >> I agree that thats not really an effective heat sink. >> >> On Sat, Feb 27, 2010 at 6:12 PM, Bob Camp<li...@rtty.us> wrote: >> >> >>> Hi >>> >>> 1mm is pretty thin for a heat sink made of steel. You might consider an >>> aluminum plate around 4 mm thick and the length and width of the case to act >>> as a heat spreader. >>> >>> The LPRO probably already has the tape on the bottom of it. The tape may be >>> in fine shape. If it's not, scrape off what remains and use a normal thermal >>> grease (heat sink compound) between the bottom of the LPRO and the heat >>> spreader. You also should fill the gap between the heat spreader and the >>> steel case with something. I would use some sort of thermaly conductive >>> epoxy. You don't need the silver loaded stuff. Ceramic loaded should be ok. >>> >>> Bob >>> >>> >>> On Feb 27, 2010, at 5:30 PM, Paul Boven wrote: >>> >>> >>>> Dear time-nuts, >>>> >>>> I've just bought a used LPRO-101 which should get a permanent home inside >>>> >>> an instrument rack. I've also found a very nice 1U high metal case, and a >>> fitting 24V 1U power supply - leaving plenty of room for a distribution amp >>> and a microcontroller to log things like lamp and Xtal voltage. >>> >>>> The rackmount enclosure is 1U high, and seems to be made of 1mm thick >>>> >>> galvanized steel. Would that make a good enough baseplate for the LPRO? >>> Would I need to do anything to improve the thermal contact between the >>> rubidium oscillator and the baseplate, and if so, any recommendations on >>> what to use there? The LPRO "User's guide and integration guidelines" >>> recommend 2degC/W thermal resistance (for up to 50degC ambient), and using >>> some special thermal tape that will probably be very hard to get at these >>> days. If any of you has already put something like this together, I'd be >>> very interested in your suggestions. >>> >>>> Regards, Paul Boven - PE1NUT >>>> >>>> _______________________________________________ >>>> 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. >> >> > > > > _______________________________________________ > 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.