Temperature Tests: Investigating a Surprising Result

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SUMMARY

The discussion focuses on temperature tests of electronic equipment, revealing that lower ambient temperatures can lead to a larger temperature delta between the ambient environment and the equipment case. Participants emphasize the importance of specific setup details, such as measurement timing after ambient temperature changes and cooling methods. Key factors include whether the equipment is fan-cooled or passively cooled, as well as the relevance of circuit board temperatures over case temperatures.

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  • Understanding of thermal dynamics in electronic equipment
  • Knowledge of temperature measurement techniques
  • Familiarity with cooling methods, specifically active vs. passive cooling
  • Experience with data analysis in temperature testing
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  • Research thermal dynamics principles related to electronic equipment
  • Learn about temperature measurement techniques and best practices
  • Investigate the differences between active and passive cooling methods
  • Explore data analysis techniques for interpreting temperature test results
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Engineers, electronic equipment designers, and thermal management specialists who are conducting temperature tests and analyzing thermal performance in electronic devices.

grillomartin
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Hi everyone.
I am performing temperature tests on an electronic equipment and I am getting some confusing results. The lowest the ambient temperature, the bigger the delta between the ambient and the equipment case. How is this possible? Is there a law of physics describing this effect?
Thanks a lot
 
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You need to be more specific about your setup, and some actual numbers would be informative.
 
Yes, data would be nice. But i don't see the problem. In general it might be what I would expect (within limits). How long after changing the ambient temperature are you measuring the case temperature? The ambient temperature is probably not enough to cool the equipment as quickly as the heat is being produced. Also the case temperature is not as important as the circuit boards. One more point is the equipment cooled with a fan or is it passively cooled by conduction of heat to the case. If it is fan cooled measure the exhaust temperature of the fan that is closer to the circuit board temp.
 

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