[time-nuts] FE-5680A thermal management
holrum at hotmail.com
Mon Jun 8 17:16:51 EDT 2009
Almost all rubidium standards DO specify the use of some form of a heat sink. For the FRK and M100 units this can be a heat sink with around 1" fins or just bolted to a metal plate or chassis.
The military freq standard that had M100's in them had the unit mounted to a 5x5x.2" aluminum plate that was in turn bolted to the chassis. My Efratom PTB-100 time bases for the Tektronix TM500 mainframes have a large heat sink mounted to a FRK style oscillator.
LPROs are supposed to be mounted to a metal chassis (they usually come with a thermal pad attached to them). I have seen them lose lock in free air. I saw one mounted in a piece of cell phone equipment. It was bolted to a large heat sink that formed most of the front of the enclosure.
I have also seen FE-5680A's in their native habitat (again, cell phone equipment). They were mounted to a thick (1/8"?) PCB around 6x16". The side of the PCB that the 5680 was bolted to had a solid ground plane. The 5650A's had one side bolted to a metal chassis.
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