1. Concept of accelerated testing
Accelerated testing refers to the process of enhancing test conditions to accelerate the failure of the tested product, while ensuring that the failure mechanism of the product is not changed, in order to obtain necessary information in a short period of time to evaluate the reliability or lifespan indicators of the product under normal conditions. Through accelerated testing, the cause of product failure can be quickly identified and the reliability indicators of the product can be quickly evaluated.
 
2. The purpose and characteristics of accelerated testing
The purpose of conducting accelerated testing can be summarized as follows:
(1) To adapt to the increasingly competitive environment;
(2) Put the product into the market as quickly as possible;
(3) Meet the user's expected needs.
Accelerated testing is a method of obtaining more information within a given test time than under normal conditions (possible information). It achieves this by adopting a testing environment that is more harsh than the environment that the device experiences in normal use. Due to the use of higher stress, attention must be paid not to introduce failure modes that would not occur in normal use during acceleration testing. In the acceleration test, the acceleration factor should be used alone or in combination, mainly including: higher frequency power cycles; Higher vibration levels; High humidity; More stringent temperature cycling; Higher temperatures.
 
3. Accelerated test classification
Accelerated testing is mainly divided into two categories, each with a clear purpose:
(1) Accelerated Life Test - Estimating Life;
(2) Accelerated stress testing - identifying (or confirming) and correcting weak links.
The differences between these two types of accelerated tests, although subtle, are important, mainly manifested in the following aspects: the basic assumptions used as the basis of the test, the models used in constructing the test, the testing equipment and venues used, the implementation methods of the test, and the methods of analyzing and interpreting the test data.

4. It is important to clarify whether the product level for accelerated testing is equipment level or component level. Some acceleration methods are only applicable to part level tests, while others can only be used for higher-level assemblies (equipment), and only a few methods are applicable to both part level and assembly (equipment) levels. The basic assumptions and modeling methods that are very suitable for the part level may not hold true when testing higher-level equipment, and vice versa.

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