Common Issues Encountered When Operating Constant Temperature and Humidity Test Chambers

For environmental testing equipment like constant temperature and humidity test chambers, various factors can affect their operation during use. Improper handling of certain issues may even lead to significant losses. If problems arise suddenly during testing, they can cause considerable inconvenience.

Many users recognize when an issue occurs with the test chamber but remain unsure how to resolve it. Below, we provide several solutions for addressing operational interruptions.

Identify the Type of Interruption
When a problem occurs, first determine whether it falls under one of the following categories based on the GJB150 standard:

Tolerance-range interruption (minor deviation within acceptable limits)
Under-test condition interruption (conditions fall below required parameters)
Over-test condition interruption (conditions exceed required parameters)
Only by identifying the specific issue can targeted solutions be applied.
Tolerance-Range Interruption
If the interruption is within the acceptable tolerance range, the error is minor and controllable. In this case, analyze the situation and treat the interruption period as part of the total test duration. The final test results will still be usable with minimal deviation.

Under-Test Condition Interruption
If the test conditions fall below the required minimum, the test may become invalid. To resolve this, adjust the conditions back to the predefined parameters before resuming the test cycle.

Over-Test Condition Interruption
If the test conditions exceed the required limits (e.g., causing sample failure), the results will be invalid. To prevent further interruptions, replace the faulty sample, ensure it meets specifications, and restart the test.

Unexpected Interruptions (Power Outages, Equipment Failures, etc.)
In cases of sudden interruptions (e.g., power or water supply cuts), seal the test chamber door and inspect the sample. If the sample remains unaffected and the equipment can quickly resume operation, handle it as an under-test condition interruption.

Additional Note:

If the interruption lasts less than 2 hours, follow the corresponding GJB150 guidelines for resolution.
If the interruption exceeds 2 hours, the entire test must be restarted.
By following these steps, users can effectively manage interruptions and ensure accurate test results.