[time-nuts] FE-5680A Results so far
EWKehren at aol.com
EWKehren at aol.com
Wed Dec 28 03:04:51 UTC 2011
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,
caf at omen.com 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 caf at omen.com 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
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