Active Member
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[China]
Contact name:Nancy Shen
Guangdong Sanwood Technology Co.,Ltd |
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Environmental Rapid Rate ESS Chamber Temperature Cycling Chamber
Average vs. Linear Temperature Transitions
In the earlier days of ESS, environmental chambers offered air temperature cycling transition rates on the order of 5°C per minute. This transition rate was often referred to as "average" by most chamber manufacturers. In reality, during an average rate temperature transition, the
air temperature rate of change may vary greatly from the average rate.
For temperature pulldowns with mechanical cooling, dT/dt will be much greater than the average in the early stages of the pulldown and much below the average as the low temperature extreme is approached. When plotted out, the time/temperature relationship is a curve with a steeper slope at the beginning of the pulldown and a flatter slope at the end, but nevertheless resulting in some average transition rate for the complete pulldown.
1. Overview of Environmental Test Chamber:
Developed to help electronics manufacturers detect product defects
and production flaws, ESS is widely used in military and aerospace
applications, less so for commercial products. The tests need not
be elaborate, for example, switching an electronic or electrical
system on and off a few times may be enough to catch some simple
defects that would otherwise be encountered by the end user very
soon after the product was first used. Tests typically include the
following:
Such a chamber can be used:
1) as a stand-alone test for environmental effects on test
specimens
2) as preparation of test specimens for further physical tests or
chemical tests
3) as environmental conditions for conducting testing of specimens
4) Temperature adaptability test under the condition of rapid
change, or gradient for electrical, electronic, instruments and
other products or spare parts, particularly applies to
environmental stress screening test(ESS)
2. What Is Environmental stress screening (ESS)
ESS refers to the process of exposing a newly manufactured or
repaired product or component (typically electronic) to stresses
such as thermal cycling and vibration in order to force latent defects to manifest themselves by
permanent or catastrophic failure during the screening process. The
surviving population, upon completion of screening, can be assumed
to have a higher reliability than a similar unscreened population
3. Standards Implemented and Met
GB10592-89 Technical requirements for high and low temperature test
chamber
GB2423.1-1989 Low temperature test
GB2423.2-1989 High temperature test mode
4. Techinical Parameter:
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Product Catalog:
Rapid Temperature Change Test Chamber.pdf
