[time-nuts] HP-5370B question

David Kirkby david.kirkby at onetel.net
Tue May 3 17:46:27 EDT 2005

wa1zms at att.net wrote:
> I have an HP-5370B which has a power supply heatsink that
> runs uncomfortably hot to the touch.(about 50C)  The unit
> appears to function just fine and the cooling fan is without
> dust or air blockage.
> Has anyone else noticed this "problem"?  

I only got my HP-5370B today, but after you said, I agree the heatsinks 
do run warm.

My HP-5370B has no rubber feet or similar underneath. They seem to have 
been removed I suspect, as there is there are what appears to be places 
where they mount.

I suspect that lifting the unit 10mm or so off the bench, with feet (if 
you don't have them) would help, as convection cooling would work 
better, whereas it will not work too well if there is no place for the 
air to enter under the heatsink.

I'm only guessing at this. I've never done a full thermal analysis of 
convection currents around a heatsink. But I suspect my situation is not 

If you want a manual, drop me a private email and cc it to drkirkby AT 
medphys DOT ucl DOT ac DOT uk.

Dr. David Kirkby,

Please check out http://www.g8wrb.org/
of if you live in Essex http://www.southminster-branch-line.org.uk/

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