On 02/02/14 21:34, Charles Steinmetz wrote:
Magnus wrote:
These days I would assume that heat-pipes would be used to move heat
to a large external heat-sink. It's fairly cheap these days.
I have looked into heat pipes for several projects, and in the end have
never used them. The main problem is that almost every solution is
customized. No trouble if you make PC motherboards or consumer-grade
stereo amplifiers 50,000 at a time. But most instruments are made in
quantities of 5,000 or fewer, and it takes many years to make (sell)
even that number. With production numbers that low, the bean counters
want the design and tooling costs amortized over the first year's
production -- maybe only 100-500 units -- which can raise the retail
price by a factor of 2-10. At least that's what I've found.
Also, most heat-pipe systems are gravity-fed, so if someone turns your
product on its side they can burn it down. (I almost always operate my
"portable" spectrum analyzer (HP8591E) standing on its rear feet with
the screen pointing up. I can foresee someone with limited bench space
setting an SR620 on its side.)
Good point.
The SR620 doesn't "stand" on the back very well, maybe on it's side, but
that helps to close the little air intake there is...
Decided to finally toss the original box for my SIA-3000. It's just big
and messy. Not tossing the SIA-3000 itself, it's a keeper.
Cheers,
Magnus
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