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

Fri Jan 6 18:15:35 UTC 2012

 What kind of temperature controlled fan did you use?

On 01/06/12, EWKehren at aol.com wrote:

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.
>
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==
> Government is not healthy for children and other living things.
> -- Jeff Daiell
>
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==
> [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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