[time-nuts] FE-5680A Results so far

[Chuck Forsberg WA7KGX N2469R]

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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