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Bill_Higdon
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Re: Too cool, literally?
Bill_Higdon   9/4/2013 7:54:39 PM
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I worked at Moxtek in Orem Utah for a period of time in the lat 90's, they build low noise JFETs, assemblies containing the JFETs and other items for XRF (X-ray Fluorescence) equipment. When the JFET assemblies are operating they're cooled to a temperature close to liquid nitrogen the only reason they're not at the same temperature as the liquid nitrogen is they have a tiny heater that keeps them at their optimal operating temperature. When  not operating & turned off their temperature gets very close to the tempo of the liquid nitrogen. One of the tests I had to run was on some Honeywell Mil-Spec IR LEDs, was simulating the cold /hot cycles the equipment would go through. The diodes had to with stand being dunked into liquid nitrogen for a specified number of times. I looked at putting together a mechanical dunker for the tests, and decided I could get it done faster by doing it by hand. While the Diodes passed with flying colors any temperature color shift didn't make them visible.

Bill


kfield
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Blogger
Too cool, literally?
kfield   9/4/2013 3:50:02 PM
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I really appreciate the irony in this comment on his website "When overclocking desktop processors one should be careful not to cool capacitors below 0°C even if it would require additional heating." 



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