Controller for an environmental test chamber

Measuring and testing – Simulated environment

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G01N 2500

Patent

active

060239859

ABSTRACT:
An apparatus for performing environmental testing on a device, and a method for controlling the atmospheric conditions of the apparatus are disclosed. The apparatus includes a test chamber and at least one air heater for controlling air temperature within the test chamber. The apparatus further includes at least one liquid heater for disposed in connection with a liquid reservoir for heating the liquid to control humidity within the test chamber. Finally, the apparatus includes first and second controllers for controlling the at least one air heater and the at least one liquid heater, and thus for controlling the temperature and humidity within the test chamber. In accordance with the method, the method includes the steps of beginning a testing cycle at a first temperature and a first humidity, and first elevating the temperature of a test chamber to at least a second temperature (where the second temperature is higher than the first temperature), while maintaining the humidity at a substantially constant level. Then, the method holds the temperature in the test chamber at a near constant temperature for a period of time. Finally, after the temperature has been elevated to its desired (target) temperature, the method elevates the humidity in the test chamber from the first humidity to at least a second humidity (where the second humidity is higher than the first humidity), while holding the temperature at a substantially constant value.

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patent: 4667522 (1987-05-01), Kawahara
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patent: 5469707 (1995-11-01), Dadachanji
patent: 5631429 (1997-05-01), Cutright et al.
patent: 5660103 (1997-08-01), Koopman

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