On 12/17/2012 02:21 AM, Bob Camp wrote:
Hi
When you blow on a TCXO you are setting up variable airflow. A fan produces a
constant airflow. A variable flow gives you a variable temperature. A constant
flow keeps things pretty uniform.
Environnemental chambers have pretty massive airflow. TCXO's and OCXO's do
quite well inside them.
The trouble with airflows over a TCXO or OCXO compared to still air, is
that you provide a better connectivity to the ambient air and it's
variations. Hence, I get to monitor the AC in the building or testlab
that way. Just tossing very mild isolation and it is almost quiet in
comparison. A good quality environmental chamber doesn't have drastic
"puffs" of heat-up, where as lesser onces do that. When testing TCXOs I
learned more about the environment chamber in use than on the TCXO itself...
Again, your mileage WILL vary.
Oh, I do know some folks that are looking into the effect of turbulence
of forced air on crystal "noise". I could find some flaws in their line
of reasoning.
Cheers,
Magnus
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