[time-nuts] Datum 1000B's any hints ?
EWKehren at aol.com
EWKehren at aol.com
Tue Aug 28 02:24:06 UTC 2012
without any EFC I would expect it to be 1 Hz low. If less than 5 Volt will
get it on frequency I would use a 78L12 from your main supply followed by a
TI REF02. Worked for me.
Bert Kehren
In a message dated 8/27/2012 10:13:35 P.M. Eastern Daylight Time,
mspencer12345 at yahoo.ca writes:
Wondering if anyone has any practical suggestions as to the operation of
stand alone Datum 1000B's. Over the last 6 months or so I've acquired 3
of them and I haven't been that impressed with their performance. I've got
a nicely running FTS 1050 and an 8600 series bva along with time lab and
some HP5370's so I'm reasonably confident in my references and test setup.
I've been powering them from stand alone linear power supplies with
separate supply and return leads for the oven and electronics and have left them
alone for several weeks at a time. I haven't touched the efc input yet
and am wondering if leaving that floating could be causing issues. I also
tried running one of them from my stand alone 24 volt battery system which
didn't seem to help.
They all seem to be gradually getting better over time but I'm thinking
either I have three duds or there is something basic I'm missing (ie. perhaps
I need to connect the efc input ?). I'm also wondering what if anything
to connect the case ground to.
The most promising of the bunch from an adev perspective is also off
frequency by approx a hz or so but seems to be slowly drifting towards the
correct value.
Any comments would be appreciated.
Regards Mark Spencer.
Sent from my iPad
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