How to choose the temperature change rate of the rapid heating and cooling test chamber?

The rapid heating and cooling test chamber is often used in the environmental stress screening test (ESS). Due to the different test requirements, the selected temperature change rate is also different. Let's take a look at the selection method of the temperature change rate in the rapid heating and cooling test chamber experiment.

1. The temperature change rate has a great influence on the temperature cycle screening effect, and this rate should be accelerated as much as possible. It is generally stipulated that the rate for screening equipment or components is not less than 5°C/min. This rate refers to the average rate of change in air temperature in the test chamber. Due to the thermal inertia of the screened product itself, the actual temperature change rate is much lower than 5°C/min, depending on the thermal inertia of the screened product itself and the capacity of the test chamber.

2. When the rate of change of the temperature test chamber is less than 5°C/min, and when quantitative screening is not planned, temperature shock (two-box method) can be used, but it should be noted that thermal shock may cause additional damage to the product and introduce faults . Products that do this should avoid temperature shock screening. Temperature shock screening is very effective at the component, module level.

3. During the quantitative screening and adjustment process, the selected rate can be adjusted according to the quantitative requirements and the number of failures observed in the screening to ensure that the quantitative target is achieved.

For the temperature change rate, there are generally three conventional rate options: 5°C, 10°C, and 15°C. You can visit the official website of "Huanyi Instrument" to learn about the parameters of the rapid heating and cooling test chamber.