MV89 may not be the best, I have better, but specs say 2 E-12 for 1 second
and tests have shown they consistently brake the 1 E-12 barrier at 1
second. The reason I mention it is it's cost. With unlimited funds many things
are possible but my challenge is lowest cost. That is why I started
On Tue, Jan 17, 2012 at 8:13 AM, ewkeh...@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
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
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
I am using a fan that holds it within .1 C Its been month since I measured
it but I did report it here and I think it is 42.7C.
Bert Kehren
In a message dated 1/17/2012 11:30:07 A.M. Eastern Standard Time,
n4ua...@gmail.com writes:
Bert,
Since you have been running your unit for a long
OK, I remember the fan controller discussion; don't know why I didn't find
it just now when I was searching this topic. Thank you very much, Bert.
geo
On Tue, Jan 17, 2012 at 11:38 AM, ewkeh...@aol.com wrote:
I am using a fan that holds it within .1 C Its been month since I measured
it but I
There is already to much clutter on the list if you want more info contact
me off list.
Bert Kehren
In a message dated 1/17/2012 11:42:23 A.M. Eastern Standard Time,
n4ua...@gmail.com writes:
OK, I remember the fan controller discussion; don't know why I didn't find
it just now when I
On Tue, Jan 17, 2012 at 8:38 AM, ewkeh...@aol.com wrote:
I am using a fan that holds it within .1 C Its been month since I measured
it but I did report it here and I think it is 42.7C.
0.1C is very good for just using a fan. What is the fe5680
mounted to? just the heat sink or is there a
I am, as I reported previously using a SMD LM335 away from the fan and held
down with a screw and a small bracket and I get consistent .1 C. I do not
think that I would get 1 E-12 over weeks when my lab has seen more than 5
C temperature changes if my temperature readings are not correct.
to Chris
What I've seen is that holding 0.1 C AT the SENSOR is pretty easy,
(Lady Heather will hold the TBolt's sensor to 0.01 deg using just a fan),
AND if you blow a lot of air around, then keeping the air gradients inside a
closed 'oven box' below 0.1 deg is also NO problem.
to Bert
Have
: Tuesday, January 17, 2012 4:02 PM
To: beale; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 5680A update (temperature stabilization)
Well done.
You have answered a couple of questions for me. The heat sink inside is
small so its easy to see why all sides of the case
Warren if you look close I did put a thermal barrier on the bottom and have
a large heat sink on the top with by my standards a large fan. All this
because I wanted it up and running with in an hour. I realize the sides also
radiate but putting a sensor at center on the bottom I am within
.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of paul swed
Sent: Tuesday, January 17, 2012 4:02 PM
To: beale; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 5680A update (temperature
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