[time-nuts] Rack-mounting an LPRO?
bruce.griffiths at xtra.co.nz
Sat Feb 27 23:51:31 UTC 2010
For operation at ambient temperatures up to 50C the manual states that a
baseplate heatsink with a thermal resistance of 2C/W or lower is required.
paul swed wrote:
> I agree that thats not really an effective heat sink.
> On Sat, Feb 27, 2010 at 6:12 PM, Bob Camp<lists at rtty.us> wrote:
>> 1mm is pretty thin for a heat sink made of steel. You might consider an
>> aluminum plate around 4 mm thick and the length and width of the case to act
>> as a heat spreader.
>> The LPRO probably already has the tape on the bottom of it. The tape may be
>> in fine shape. If it's not, scrape off what remains and use a normal thermal
>> grease (heat sink compound) between the bottom of the LPRO and the heat
>> spreader. You also should fill the gap between the heat spreader and the
>> steel case with something. I would use some sort of thermaly conductive
>> epoxy. You don't need the silver loaded stuff. Ceramic loaded should be ok.
>> On Feb 27, 2010, at 5:30 PM, 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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