[time-nuts] Power supply for 'Bay FE-5680A?

Fri Jan 6 18:06:02 UTC 2012

I do not understand why this is even discussed. Running at lower  
temperature will extend life and using a fan with temperature control will cost  no 
more than $ 12 and I challenge any of you how I can get for so little money  
more than one order of magnitude improvement. As I reported before I started 
out  with heat sink only and quickly realized that I would not be able to 
measure  aging because the last 2 digits where all over the place and unless 
you have an  environment where your lab is within 0.1C  you are throwing 
away the real  advantage of a Rb.
I did enclose the Rb cell and the OCXO on a FEI 5962B, its modularity lends 
 it self for such testing, it was not worth the effort and the power saving 
was  minimal.
Once my aging tests are completed I will test for 15 V voltage  sensitivity.
Bert Kehren

In a message dated 1/6/2012 11:35:02 A.M. Eastern Standard Time,  
nerd at verizon.net writes:

A heat sink may not be required, per se, although I  would expect that a
larger thermal mass and/or thermal  regulation via a closed loop fan
controller will help smooth  out/stabilize temperature effects.

On 01/06/12, Chuck  Forsberg WA7KGX N2469R<caf at omen.com> wrote:

The Tech  Manual does not call for heat sinking (unless I missed
something).
The top has labels over much of the  surface.
The bottom has a plastic sheet between the circuitry  and bottom plate.
It appears the unit was expected to be  rather hot when running.
I have mine mounted on the out side  of the box using standoffs.
On 01/06/2012 07:39 AM, Bob  Smither wrote:
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> Chris Albertson wrote:
>> On  Thu, Jan 5, 2012 at 6:11 PM,<[1]time-nuts at custodes.info>  wrote:
>>
>>>  l<[2]http://www.freqelec.com/rb_osc_fe5680a.html> says 32W  peak,
but then
>>> also 15-18v at 700mA,  which doesn't make sense.
>>
>> It  will pull 35W for the first five or so minutes then the  current
drops
>> rather suddenly to  about 700mA.
>>
>> I have an  analog amp meter on my power supply and I can see a switch
over
>> after the unit heats up. They must run an  internal oven heater full
tilt
>> at  first then go into regulated mode.
>>
>> Some one else said you can cause the FE5680 to draw more power  in
steady
>> state mode by adding heat  sinking it. Yes that works. Seems the
FE5680
>> wants to be at some set temperature and the heat sink means it  takes
more
>> power to keep at the set  point. I just let the fe5680 rest on a
small
>> aluminum plate.
> Have you measured the case  temperature of your FE5680?
>
> I put  mine on a heat sink and the case temperature stays around 50C.
Without
> the heat sink it was around 60C. Does anyone know  what temperature is
> recommended? The 50C seems a little  hot, but the unit appears to work
well.
>
> - --
> Bob Smither, PhD Circuit  Concepts, Inc.
>
=======================================================================
==
> Government is not healthy for children and other  living things.
> -- Jeff Daiell
>
=======================================================================
==
> [3]Smither at C-C-I.Com [4]http://www.C-C-I.Com  281-331-2744(office)
-4616(fax)
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--
Chuck Forsberg WA7KGX N2469R [8]caf at omen.com [9]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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References

1.  mailto:time-nuts at custodes.info
2.  http://www.freqelec.com/rb_osc_fe5680a.html
3.  mailto:Smither at C-C-I.Com
4.  http://www.C-C-I.Com/
5.  http://enigmail.mozdev.org/
6.  mailto:time-nuts at febo.com
7.  https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
8.  mailto:caf at omen.com
9. http://www.omen.com/
10.  mailto:time-nuts at febo.com
11.  https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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