Reliability test: what are the items of product reliability test?

Date：2021-10-25 16:08:00Views：1136

The test to evaluate and analyze the reliability of electronic products is called reliability test. For different products, in order to achieve different purposes, different reliability test methods can be selected. Reliability test is also called product reliability. It refers to the ability of a product to complete specified functions under specified conditions and within specified time. In the process of design and application, the product is constantly affected by its own and external climate environment and mechanical environment, but still needs to work normally. Therefore, it needs to be verified with test equipment. This verification is basically divided into three parts: R & D test, trial production test and mass production sampling inspection.

Classification method of reliability test:

1. If divided by environmental conditions, it can be divided into simulation test and field test under various stress conditions;

2. Divided by test items, it can be divided into environmental test, life test, accelerated test and various special tests;

3. If it is divided according to the test purpose, it can be divided into screening test, test and acceptance test;

4. If divided according to the nature of the test, it can also be divided into destructive test and non-destructive test.

5. However, the commonly used classification method is to classify it into five categories: A. environmental test B. life test C. screening test D. field use test E. test 1 Environmental test is to assess the adaptability of products under various environmental conditions (vibration, impact, centrifugation, temperature, thermal shock, hot tide, salt spray, low pressure, etc.), and it is one of the important test methods to evaluate the reliability of products.

Reliability test mainly includes:

1. Climate and environment test: high and low temperature test, alternating high and low temperature test, rapid temperature change test, low pressure test and protection grade test;

2. Salt spray test: neutral salt spray, acid salt spray, copper accelerated salt spray and circulating salt spray.

3. Mechanical test: vibration test (random vibration, sweep frequency vibration), mechanical impact test and drop test.

4. Mechanical system performance test: tensile performance, bending performance, compression production performance, pendulum impact.

5. Thermal performance test: thermal deformation temperature, Vicat softening point and melting index.

6. Electrical system performance: dielectric strength, insulation material resistance, contact resistance, grounding influence resistance and voltage drop.

7. Material test: Xenon lamp aging test, fluorescent lamp aging test, material shore hardness, pencil hardness, chemical resistance, color difference, gloss, adhesion and adhesion.

Reliability test standard:

1. Working test of lower temperature limit: the test sample shall be powered on and run the test procedure for preliminary test. When the test sample does not work, gradually reduce the temperature in the box to 0 ℃. After the temperature is stable, power on and run the test program for 5h. The function and operation of the test sample shall be normal. After the test, take out the sample after the box temperature returns to room temperature and recover for 2h under normal atmospheric pressure.

Recommended inspection standard: the function and operation of the tested sample shall be normal, and there shall be no obvious deviation in appearance.

2. Low temperature storage test: put the sample into the low-temperature box to reduce the box temperature to - 20 ℃, store it for 16h under the condition that the test sample does not work, take out the sample and return to the room temperature, restore it for 2h, power on and run the test procedure for final inspection. The function and operation of the test sample should be normal without obvious deviation from the outside. In order to prevent the test sample from frosting and condensation during the test, it is allowed to seal the test sample with polyethylene film and install moisture absorbing agent in the sealing sleeve if necessary.

3. Upper temperature limit working test: conduct preliminary test on the tested sample first. When the test sample is not working, gradually raise the box temperature to 40 ℃. After the temperature is stable, power on and run the system diagnostic program for 5h. The function and operation of the test sample shall be normal. After the test, take out the sample after the box temperature returns to room temperature and recover for 2h under normal atmospheric pressure.

4. High temperature storage test: put the sample into the high temperature box to raise the box temperature to 55 ℃, store it for 16h when the test sample is not working, take out the sample and return to room temperature for 2h.

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