[time-nuts] Rack-mounting an LPRO?

[Bob Camp]

HI

Running the LPRO from a supply below 19 volts is a good idea. As you raise the voltage into the unit, a lot of the energy simply goes into heat. Not a good thing when you have  a marginal heatsink in the first place.

Bob
On Feb 27, 2010, at 8:56 PM, Ed Palmer wrote:

> What else is going to be in the rack?  If your 1U enclosure is packed in tight between other devices there might be no cooling at all.  You might need a fan to move some air.
> 
> I don't know if you can find something like this, but I scavenged heat sinks from an old Compaq DL760 server that might fit your situation.  Here's what the heat sink looks like.  The aluminum plate is about 1/4" (6.4 mm) thick.  Notice the heat pipes.
> 
> 
> 
> Here's what it looks like on the LPRO.  You'll have to drill holes in the plate to match the LPRO.
> 
> 
> 
> It's not perfect, but it certainly does the job - particularly if you had a fan blowing through the fins.  The total height is about 1.75" (45 mm).
> 
> But remember, the more you cool the LPRO, the more power it will draw to keep itself warm so you don't want to overdo the cooling.
> 
> Ed
> 
> Paul Boven wrote:
>> Dear time-nuts,
>> 
>> I've just bought a used LPRO-101 which should get a permanent home inside an instrument rack. I've also found a very nice 1U high metal case, and a fitting 24V 1U power supply - leaving plenty of room for a distribution amp and a microcontroller to log things like lamp and Xtal voltage.
>> 
>> The rackmount enclosure is 1U high, and seems to be made of 1mm thick galvanized steel. Would that make a good enough baseplate for the LPRO? Would I need to do anything to improve the thermal contact between the rubidium oscillator and the baseplate, and if so, any recommendations on what to use there? The LPRO "User's guide and integration guidelines" recommend 2degC/W thermal resistance (for up to 50degC ambient), and using some special thermal tape that will probably be very hard to get at these days. If any of you has already put something like this together, I'd be very interested in your suggestions.
>> 
>> Regards, Paul Boven - PE1NUT
>> 
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