[time-nuts] PRS10 rubidium lamp module failure

[Vasco Soares]

I agree with Arthur. It's not possible that such temperature had happened. 
My unit had a severe board and components electrochemical corrosion probably 
caused by a mix of factors as flux residues action and the pcb coating that 
simple dissapear. I think that all together under hot conditions in a small 
enclosure is the most probably reason to that failure. Also, in picture it 
can be seen clearly many spots with electrochemical corrosion.



----- Original Message ----- 
From: "Arthur Dent" <golgarfrincham at gmail.com>
To: <time-nuts at febo.com>
Sent: Tuesday, May 10, 2016 1:06 AM
Subject: [time-nuts] PRS10 rubidium lamp module failure


> ..."apparently got hot enough to create a localized thermal runaway in
> its lead wire."
>
> I don't think that explanation is correct. There are no signs of
> discoloration
> caused by overheating anywhere else in the photo and yet the lead wire
> has apparently melted as you say. That would probably require at least a
> 2000 degree temp which would cause lots of damage. Are there any signs
> of chemical contamination that could have caused this? Not the same but
> In older equipment that had leaky Hg batteries I've seen similar damage.
>
> -Arthur
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