The manufacturers data sheet presents MTBF figures for the LPRO
and they decline considerably with higher temperatures.
Against that the power required decreases with rising temperature,
so that at 19 volt supply and 40-45*C the unit takes much lower
power and has
still has most of its expected life.
cheers,
Neville Michie
On 18/07/2011, at 1:59 PM, Chuck Harris wrote:
For all of this attention to cooling the oven on the Rb standards,
has anyone seen any failures that are attributable to heat?
I sort of doubt it.
-Chuck Harris
[email protected] wrote:
I monitor and fan cool the base plate, stays nice and constant at
45 C
which I can not say with heat sink only. I am considering lowering
the base
plate to 40 C. I have a heat sink on the base plate with the fan
blowing over
it. Makes good heat exchanger. I have experimented with heat pipes
from Lap
Tops but never fit for mechanical reasons. May work with a
LPRO's. Al my
Rb's are Efratom.
A variable speed fan will reduce any ambient temperature
influence. That is
why I chose to use a fan.
Use a dual Op Amp for temp. control. Nothing special. Fans are $
3.00 I
have monitored points inside the Rb's and they are within 1 C over
time.
Bert Kehren
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