test project

 thermal shock test

       reference standard

      GB/T 2423.22-2012 ，IEC 60068-2-14-2009

       capabilities

 Temperature range: -40℃~150℃ (two boxes);
       600×500×500mm。High and low temperature conversion time: ≤ 10S

Cold and thermal shock test-reliability cold and thermal shock test report. The cold-thermal shock test involves alternately exposing the test specimen to low and high temperature air (or an appropriate inert gas) to withstand the effects of rapid temperature changes. It is used to evaluate the adaptability of a product to rapid changes in the surrounding temperature. It is an identification test for equipment design finalization and a routine test during the batch production stage. It can also be used for environmental stress screening tests. It can be said that the cold and hot impact test chamber is second only to vibration and high and low temperature tests to verify and improve the environmental adaptability of the equipment.

Cold and hot impact tests, also known as temperature impact tests or high and low temperature impact tests, are mainly used to evaluate the adaptability of products to rapid changes in environmental temperature. It is an indispensable test in equipment design finalization identification tests and routine tests in batch production stages. In some cases, it can also be used for environmental stress screening tests. In terms of verifying and improving equipment environmental adaptability, the application frequency of cold and hot impact testing is second only to vibration and high and low temperature testing.

Purpose of thermal shock test:

Verify sample conditions under rapidly changing conditions at high and low temperatures for use and storage.

Principle of cold and thermal shock test:

When the temperature changes rapidly, thermal expansion and cold shrinkage effects cause alternating stresses, leading to material cracking, poor contact, performance changes and other phenomena.

What is the method of cold and thermal shock testing?

(1) Before the test, check the mechanical properties (appearance and internal structure) and electrical properties of the sample under test to ensure that the mechanical and electrical properties of the sample are normal;

(2) The samples should be reasonably arranged in the temperature impact box, and enough space should be left between the samples and the walls of the temperature box to facilitate air circulation;

(3) Select temperature impact test conditions according to the above table;

(4) Select the temperature impact test to start at high temperature, and then press the Start button to start the temperature impact test;

(5) The test automatically stops after the set number of cycles;

(6) After the test is over, remove the sample from the temperature shock box and recover at room temperature until the sample temperature reaches a stable level;

(7) Observe whether the samples after the test have mechanical damage (such as surface warping, fracture, loose parts, falling off, etc.), and check whether the electrical properties are abnormal;

(8) If the above-mentioned mechanical damage or electrical performance indicators of the sample do not comply with relevant specifications and it is believed that the sample is also damaged, the test record form should be filled in detail;

(9) Analyze the weak links exposed in the test and propose improvement measures

(10) Repair or improve the sample. If there is no damage, increase the temperature shock level. Under the temperature impact test conditions in the above table, take a board level made of ordinary parts or a board level made of surface attached parts and continue the test until the specimen is damaged.