Rapid temperature change test - Reliability Test

Date：2021-11-05 15:00:00 Views：1409

Rapid temperature change test is a kind of environmental test. The rapid temperature change test chamber is used to set a certain temperature change rate for the rapid transition between high temperature and low temperature. It is used to determine the adaptability of products to storage, transportation and use in the climate environment with rapid changes of high temperature and low temperature. The severity of the rapid temperature change test depends on the high / low temperature range, the change time, and the number of cycles. The test process generally takes normal temperature → low temperature → low temperature residence → high temperature → high temperature residence → normal temperature as a test cycle. Verify the change of functional characteristics of the sample after temperature change or continuous temperature change environment, or the operation functionality in this environment.

Rapid temperature change test is usually defined as the temperature change rate ≥ 3 ℃ / min, which changes between a certain high temperature and low temperature. The faster the temperature change rate, the larger the high / low temperature range and the longer the time, the more strict the test is. Temperature impact usually has a more serious impact on the part close to the outer surface of the equipment. The farther away from the outer surface, the slower the temperature change, and the less obvious the impact. Transport cases, packaging, etc. will also reduce the impact of temperature impact on closed equipment. Sharp temperature changes may temporarily or permanently affect the operation of the equipment.

Purpose of rapid temperature change test

Rapid temperature change test is a necessary test in aviation, automobile, household appliances, scientific research and other fields to assess and determine the parameters and performance adaptability of electrical, electronic, automotive electrical appliances, materials and other products after the impact change of temperature environment in high and low temperature test.

Rapid temperature change test temperature range: - 60 ℃ ~ 150 ℃, temperature rise and fall speed: 8 ~ 10 ℃ / min, load power: 20kW

Evaluate the storage or working adaptability of the product under the condition of temperature change. The purpose of qualification test is to check whether the product meets the requirements of relevant standards; The improvement test is mainly used to evaluate the durability, reliability and adaptability of products under the condition of temperature change.

Rapid temperature change test items include

High temperature test, low temperature test, rapid temperature change test, cold and heat shock test, temperature cycle test, damp and heat test, low pressure test, salt spray test, composite salt spray test, xenon lamp aging test, ultraviolet aging test, solar radiation test, waterproof test, dustproof test, shell protection grade test, ozone test, mold test, gas corrosion test High pressure cooking test, condensation test, etc.

Scope of application

The rapid temperature change test is mainly suitable for military industry, research institutes, factories, schools and other units. It is the test and assessment required by scientific research, automobile, household appliances and other fields, and determines the parameters and performance adaptability of electrical, electronic, automobile electrical appliances, materials and other products after the impact change of temperature environment in high and low temperature test.

Reference standard for rapid temperature change

GB/T2423. 34 < < environmental testing Part 2: Test methods Test ZAD: combined cycle test of temperature and humidity >

IEC 60068-2-38 < environmental testing Part 2: Test methods Test ZAD: Combined temperature and Humidity Cycle Test >

GJB150. 5 < < environmental test methods for military equipment temperature shock test >