Analyze the hardware reliability test design with examples

　　From the perspective of hardware, reliability tests are divided into two categories:

　　Reliability testing based on industry standards or national standards. Such as electromagnetic compatibility test, climatic environmental test, mechanical environmental test and safety test.

　　The test items developed by the charger manufacturer based on its product characteristics and obituary knowledge of quality. For example, some fault simulation tests, voltage bias tests, fast power-on and power-off tests, etc.

　　1. Reliability test method based on industry standards and national standards

　　Products will inevitably endure many external stresses during their life cycle. Common stresses include business load, temperature, humidity, dust, air pressure, and mechanical stress. The makers of various industry standards and national standards have given out how much stress a certain type of product will have under which application environment, and standard users should select the corresponding test conditions according to the product’s application environment and quality requirements. Stress level, this selected stress level is essentially the product test specification.

　　In the product testing phase, we must apply the corresponding stress types and stress levels to enough test samples in a laboratory environment to examine the working stability of the product. For communication equipment, common test items include at least electromagnetic compatibility test, safety test, climate type environmental test and mechanical environment test, and the above four types of test items also contain many test sub-items, such as climate type environmental test also includes high temperature Work test, low temperature work test, damp heat test, temperature cycle test, etc. There are many such test items, so I won’t introduce them in detail here. In general, all test items belong to the specification compliance test (that is, PASS or FAIL test). The purpose of the test is to simulate the stress type and stress level of the product during its life cycle, and to examine its working stability.

　　2. Reliability test method designed by charger manufacturer

　　Because the functions of network products are very different, the application scenarios may be various, and the industry standards and national standards related to unreliability testing are generally only given for the test stress conditions of a certain type of product without specifying the tested Under what working state or configuration combination the device is tested, so some test combinations may be missed in the test design. For example, frame-type products, line card types, line card installation positions, message types, and system power configuration can be flexibly matched. This involves more test combinations, and there will inevitably be more extreme test combinations in this test combination. Another example is to verify the system heat dissipation performance of the chassis. The worst test combination is to fully configure the line card board with the maximum power on the heat dissipation condition chassis; if you consider the low temperature working performance of a certain line card board, the more extreme combination is The board with the least configuration on the chassis with the best heat dissipation condition has the least power consumption, and the board is placed in the slot with the best heat dissipation.

　　In short, when the power adapter company is doing test design, it needs to go beyond the limitations of traditional test specifications and test standards, and implement test design from the perspective of product application to ensure that the product’s typical application combination, full configuration combination or extreme test combination A hardware feature and hardware function are fully exposed to various test stresses, and the reliability of the product is guaranteed only when the test in this link is guaranteed.

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