Why should electronic products be tested for reliability? What is the purpose?

Date：2021-11-23 14:38:20Views：2206

Why should enterprises conduct reliability testing on electronic products? What is the purpose of reliability testing? The so-called reliability is the ability of the product to complete the specified functions under the specified conditions and within the specified time. In the process of design and application, the product continues to be affected by its own and external climatic environment and mechanical environment, but still needs to be able to work normally. Therefore, it needs to be verified with test equipment. This verification is basically divided into R & D test, trial production test There are three parts of mass production sampling inspection. In short, reliability refers to the ability to complete the specified functions within the specified time and under the specified conditions.

For products, the higher the reliability, the better. Electronic products with high reliability can work normally for a long time (which is what all consumers need). Generally speaking, the R & D and production costs will be higher, but the later maintenance costs will be less; Generally speaking, for products with low reliability, the R & D and production costs will be low, but the later maintenance costs will be high. In professional terms, the higher the reliability of the product, the longer the time the product can work without failure.

The reliability of the product in actual use is called working reliability. Working reliability can be divided into inherent reliability and use reliability. Inherent reliability is the reliability that product designers and manufacturers must establish, that is, the reliability established in accordance with the reliability planning, from the selection of raw materials and parts, through design, manufacturing and test, to each stage of product production. Service reliability refers to the reliability of produced products affected by packaging, transportation, storage, installation, use, maintenance and other factors.

The elements of electronic product reliability definition are:

Specified conditions (environmental conditions, load conditions, working mode);

Specified time (time to keep the product in good working condition and product life;

Specified functions (realization of product functions and product commitment to functions).

1. Reliability test is an activity to ensure that electronic products maintain functional reliability in all environments such as expected use, transportation or storage within the specified service life.

2. It is to expose electronic products to natural or artificial environmental conditions to withstand their effects, so as to evaluate the performance of electronic products under the environmental conditions of actual use, transportation and storage, and analyze and study the influence degree and action mechanism of environmental factors.

3. By using various environmental test equipment to simulate the high temperature, low temperature, high temperature, high humidity and temperature change in the climatic environment, accelerate the reaction of the product in the service environment, so as to verify whether it meets the expected quality objectives in R & D, design and manufacturing, so as to evaluate the overall product to determine the reliability life of the product.

Generally, the purpose of reliability test for electronic products is as follows:

(1) In the development stage, make the product reach the predetermined reliability index

In order to make the product reach the predetermined reliability index, it is necessary to carry out reliability test on the samples in the development stage, so as to find out the problems existing in the raw materials, structure, process and environmental adaptability of the product and improve them. After repeated test and improvement, the reliability indexes of the product can be continuously improved to meet the predetermined requirements.

(2) Conduct reliability appraisal during product development and finalization

During the development and finalization of new products, identification tests shall be carried out according to product standards (or product technical conditions), so as to comprehensively assess whether the products meet the specified reliability indicators.

(3) Control the quality of products in the production process

In order to produce products stably, it is sometimes necessary to conduct reliability test for each product according to the items specified in the product technical conditions. In addition, reliability sampling test shall be carried out batch by batch or within a certain period. The stability of product quality can be understood through the reliability test of products. If the product quality drops due to poor quality of raw materials or out of control of process flow, it can be reflected in the product reliability test, so that corrective measures can be taken in time to restore the product quality to normal.

(4) Screen the products to improve the reliability of the whole batch of products

Reasonable screening can eliminate the early failure products caused by various reasons (such as defective raw materials, improper process measures, negligence of operators, failure of production equipment and lax quality inspection, etc.), so as to improve the reliability level of the whole batch of products.

(5) Study the failure mechanism of the product

Through the product reliability test (including simulation test and field use test), we can understand the failure mode and failure law of the product under different environments and different stress conditions. Through the analysis of failed products, the internal causes (i.e. failure mechanism) and weak links of products can be found out, so that corresponding measures can be taken to improve the reliability level of products.

This article is introduced here. I believe that by reading the above contents, we have a preliminary understanding of electronic product reliability testing. At the same time, we also hope that we can make a summary in the learning process, so as to continuously improve our professional level.