I just got back from running an other test on my 5680 and for 24 days now it has been reading consistently 9.99999999944 MHz! I average over 1000 seconds because feeding two Tbolts into a Tracor 527E I do see up to +_2 E-11 changes off and on, and one runs all my instruments. I am waiting for aging changes before I modify the C field circuit. Bert Kehren In a message dated 12/27/2011 11:52:27 A.M. Eastern Standard Time, [email protected] writes:
After a few days of fooling around it appears my $38.00 Rb frequency standard is meeting its specs except for the current draw on the 5 volt supply. The attached plot shows phase readings between the Rb and a ThunderBolt made by a Racal-Dana 1992 counter read out by Fedora Linux 16 and a National Instruments PCI GPIB interface. I entered various frequency offsets with my own comms software downloadable from omen.com. The "transients" are manual slewing events where I set an offset of 0 until the phase swings around to 180 degrees. The last such event covered 360 degrees in about 100 seconds; the result agrees with the specified resolution of 1e-12. The Rb seems to be meeting its 10-11/day spec. If I did the math correctly, that corresponds to measuring the distance to the Moon within tenths of an inch. My next step is to leave it alone for a day or two. -- Chuck Forsberg WA7KGX N2469R [email protected] 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 -- [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.
