Monsterously thick will NOT do it. All that does is increase the heat capacity of the HS, not it's ultimate thermal resistance (W/deg).
You need surface area and air flow to cool something. The air flow is needed because there is a "film coefficient" between the HS and the room air. Even minimal air flow drastically reduces the film coefficient, increasing heat flow per square inch. -John ============== > The heat sink requirements are in the LPRO manual that is available on the > net. My recollection is that the sink would require fins unless it was > monstrously thick. The requirement is to keep the base plate less than 70 > degrees C and the manual says this will require a heat sink with a thermal > resistance of less than 2 degrees C per Watt in order to achieve this in > an > environment up to 50 degrees C. > > You can, however, turn it on to check it for a few minutes, without a heat > sink attached. > > Joe > > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of William Zimmer > Sent: Wednesday, September 23, 2009 8:41 AM > To: [email protected] > Subject: [time-nuts] LPRO Heat Sink? > > I am new to the Time-Nuts list and to the time standard area in general, > so please excuse my questions if they has been asked and answered before. > > I just purchased an Efratom LPRO 101 Rubidium frequency standard. As I > understand it, I must mount it on a heat sink. > > > > Question 1: The lamp and chamber operate at a temperature around 100 > degrees C and we must provide sufficient power to heat the unit. If we > are heating the unit, why do we need a heat sink? Doesnt the heat sink > defeat the heating process? > > Question 2: Assuming that there is a reasonable answer to question1 and > a heat sink is needed, how big a heat sink is required? Are fins > required? Is forced air required? In other words, what do I have to do > to mount the LPRO 101 correctly? > > Thank you in advance for your assistance. > > > > Bill Zimmer, N3VTW > _______________________________________________ > 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. > > _______________________________________________ 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.
