Thanks.. That seems like a good next step. (Just to add to this, all three of the units have functional trim pots and two of three units will easily adjust to the correct frequency.) > > Message: 7 > Date: Mon, 27 Aug 2012 22:24:06 -0400 (EDT) > From: [email protected] > To: [email protected] > Subject: Re: [time-nuts] Datum 1000B's any hints ? > Message-ID: <[email protected]> > Content-Type: text/plain; charset="US-ASCII" > > 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, > [email protected] > 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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