Test FAQ
Questions are divided in categories. Click on the subject you are interested in to display answers.
| Acceleration test and lifetime evaluation |
| Q1. |
What is the calculation method to obtain the acceleration factor? |
| Q2. |
How to determine Ea (Activation energy)? |
| Q3. |
To how many years under ambient temperature and humidity conditions does correspond a test at 120ºC/ 85%rh performed during 100 hours in a HAST? |
| Q4. |
To how many hours of Thermal cycling test does liquid thermal test correspond to? |
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| Temperature cycling |
| Q1. |
When performing a Temperature Cycling Test to evaluate the solder joints reliability, does the fact of taking the specimen out and in of the test area has an impact on the test results? |
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| HAST・PCT |
| Q1. |
A specimen did not failed under a test at 131ºC/ 85%rh, but failed when performing a test at 121ºC/ 100%rh in a shorter period. Does this mean that even under lower temperature, the pressure saturation is a greater stress on the specimen? |
| Q2. |
According to the literature on PCT (Pressure Cooker), because of sudden change of temperature/ pressure after the test, the vapor contained in the specimen boil and re-radiate, thus inducing mechanical damages on the specimen. Is this phenomenon really happen? |
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| Solder |
| Q1. |
Where is the deterioration of solders usually determined? |
| Q2. |
What is the cause of solder cracks generation? |
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| Moisture resistance test |
| Q1. |
What is the water consumption of a Temperature & Humidity Chamber (Platinous K Series) when operated at 85ºC/ 85%rh.? |
| Q2. |
Between a test at 60ºC/ 95%rh and 85ºC/ 85%rh, which one is the most severe? |
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