At 10:13 AM -0700 5/22/09, Tom Van Baak wrote:
One comment, and one idea on airflow...
I'm sure we could discuss for some time what airflow is too much
or too little or where to place the thermal probes or how to take IR
scans or how then interpret them. But it seems to me the bottom
line is not what the temp is inside, but how the unit performs; how
stable the time interval counter is. voltco; tempco; airco?
/tvb
Tom,
The fans in a 5370B have nothing to do with stability; if anything,
they make it worse.
The reason for the fans is to prevent premature failures of the
silicon devices due to thermal degradation. The life of a silicon
chip is halved for every 10C temperature increase, more or less.
In a world of perfect thermal engineering, the chips would be
attached to a metal plate that is kept at a constant temperature. But
that's impractical for cost, weight and maintenance reasons.
Given that many of these ECL chips are no longer made, keeping them
cool for long life is of utmost importance.
--
--David Forbes, Tucson, AZ
http://www.cathodecorner.com/
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