[time-nuts] 5680A update

George Dubovsky n4ua.va at gmail.com
Tue Jan 17 11:29:44 EST 2012


Bert,

Since you have been running your unit for a long time, what temperature are
you holding your 5680 to? I suppose more to the point, I attached my unit
to a 1/2" think aluminum plate slightly larger than the 5680 footprint, and
that in turn is attached to a painted surface of a cabinet (no effort to
achieve max temp transfer there). The top (hidden mounting screw) of my
unit stabilizes at 140 F. It locks up just fine, but sometimes, after
several hours, it will unlock and fail to re-lock. I was wondering if I
need to drop the temperature.

geo

On Tue, Jan 17, 2012 at 11:13 AM, <EWKehren at aol.com> wrote:

> After eight weeks of monitoring to 1 E-12, I still se no aging. Waiting for
>  a change so I can do other tests. One thing I clearly se is a 4 Hz filter
> response changing the output by +- 3 E-11. It may be more, will have to
> find a  way to check it more accurately, because of limited response time.
> I
> for one  will fix that problem with a Morion MV 89 and a 100 Hz analog
> filter.
> New  Morion's are available for less than $ 30 the ones I bought seem new.
> That's  also where I got my 5680A
> Have no contact with the seller.
> Bert Kehren
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