What kind of temperature controlled fan did you use? On 01/06/12, ewkeh...@aol.com wrote: I do not understand why this is even discussed. Running at lower temperature will extend life and using a fan with temperature control will cost no more than $ 12 and I challenge any of you how I can get for so little money more than one order of magnitude improvement. As I reported before I started out with heat sink only and quickly realized that I would not be able to measure aging because the last 2 digits where all over the place and unless you have an environment where your lab is within 0.1C you are throwing away the real advantage of a Rb. I did enclose the Rb cell and the OCXO on a FEI 5962B, its modularity lends it self for such testing, it was not worth the effort and the power saving was minimal. Once my aging tests are completed I will test for 15 V voltage sensitivity. Bert Kehren In a message dated 1/6/2012 11:35:02 A.M. Eastern Standard Time, n...@verizon.net writes:
A heat sink may not be required, per se, although I would expect that a larger thermal mass and/or thermal regulation via a closed loop fan controller will help smooth out/stabilize temperature effects. On 01/06/12, Chuck Forsberg WA7KGX N2469R<c...@omen.com> wrote: The Tech Manual does not call for heat sinking (unless I missed something). The top has labels over much of the surface. The bottom has a plastic sheet between the circuitry and bottom plate. It appears the unit was expected to be rather hot when running. I have mine mounted on the out side of the box using standoffs. On 01/06/2012 07:39 AM, Bob Smither wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Chris Albertson wrote: >> On Thu, Jan 5, 2012 at 6:11 PM,<[1]time-n...@custodes.info> wrote: >> >>> l<[2]http://www.freqelec.com/rb_osc_fe5680a.html> says 32W peak, but then >>> also 15-18v@700mA, which doesn't make sense. >> >> It will pull 35W for the first five or so minutes then the current drops >> rather suddenly to about 700mA. >> >> I have an analog amp meter on my power supply and I can see a switch over >> after the unit heats up. They must run an internal oven heater full tilt >> at first then go into regulated mode. >> >> Some one else said you can cause the FE5680 to draw more power in steady >> state mode by adding heat sinking it. Yes that works. Seems the FE5680 >> wants to be at some set temperature and the heat sink means it takes more >> power to keep at the set point. I just let the fe5680 rest on a small >> aluminum plate. > Have you measured the case temperature of your FE5680? > > I put mine on a heat sink and the case temperature stays around 50C. Without > the heat sink it was around 60C. Does anyone know what temperature is > recommended? The 50C seems a little hot, but the unit appears to work well. > > - -- > Bob Smither, PhD Circuit Concepts, Inc. > ======================================================================= == > Government is not healthy for children and other living things. > -- Jeff Daiell > ======================================================================= == > [3]smit...@c-c-i.com [4]http://www.C-C-I.Com 281-331-2744(office) -4616(fax) > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.5 (GNU/Linux) > Comment: Using GnuPG with CentOS - [5]http://enigmail.mozdev.org > > iD8DBQFPBxXFsmY7BY+CYksRAlutAJ9R9STR0oja4ib1CjKXLEfGe3uXpgCfRW8D > m78FO0Trn+6bIBPKrNs8PVQ= > =FdtA > -----END PGP SIGNATURE----- > > > _______________________________________________ > time-nuts mailing list -- [6]time-nuts@febo.com > To unsubscribe, go to [7]https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Chuck Forsberg WA7KGX N2469R [8]c...@omen.com [9]www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc "The High Reliability Software" 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 _______________________________________________ time-nuts mailing list -- [10]time-nuts@febo.com To unsubscribe, go to [11]https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. References 1. mailto:time-n...@custodes.info 2. http://www.freqelec.com/rb_osc_fe5680a.html 3. mailto:smit...@c-c-i.com 4. http://www.C-C-I.Com/ 5. http://enigmail.mozdev.org/ 6. mailto:time-nuts@febo.com 7. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts 8. mailto:c...@omen.com 9. http://www.omen.com/ 10. mailto:time-nuts@febo.com 11. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ 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.