How to understand reliability testing? What test items does the reliability test include?

Date：2022-04-11 17:11:53Views：1154

Reliability test, also known as reliability evaluation, refers to evaluating the reliability characteristics of products by using probability statistical method according to the reliability structure, life type and reliability test information of each unit. Software reliability is the ability of a software system to complete specified functions within a specified time and under specified environmental conditions. Generally, the reliability of software system can only be measured by testing it.

Reliability test mainly includes:

1. Climate and environment test: high temperature test, low temperature test, temperature and Humidity Cycle / constant damp heat test, cold and heat shock test, rapid temperature change test, low pressure test, light aging test, corrosion test, etc.

2. Mechanical environment test: vibration test, impact test, collision test and drop test.

3. Comprehensive environmental test: temperature + humidity + vibration / shock / collision, halt / Hass / hasa, temperature and humidity stacking test, high-pressure cooking test.

4. Packaging materials and packaging transportation test: ambient temperature and humidity test, stacking test, packaging compression test, vibration test, impact test, drop test, collision test, horizontal clamping test and low air pressure test.

5. IP protection test: dustproof test and waterproof test.

6. Physical performance test: 100 grid test, wear test, scratch test, plug test, bending test, color fastness test, fire / combustion test; Swing test, key life test, hardness test, drop impact / pendulum impact test, tensile strength / compressive strength / yield strength test, melt index test.

7. EMC environment test: RF performance test, SAR test, OTA test, HAC test, tcoil test, digital TV performance test, audio and video product performance test, satellite navigation product (GPS) performance test, flat panel display performance test, medical device registration test, telecom access license test.

8. Electrical performance test: temperature rise test, withstand voltage test, insulation resistance test, dielectric strength test, contact resistance test, surface resistivity test and grounding resistance test.

9. Failure analysis and testing: surface / polar surface micro measurement and analysis, nondestructive measurement and analysis, electrical performance measurement and analysis, physical performance measurement and analysis, welding process measurement and analysis, PCB / PCBA measurement and analysis, electronic components measurement and analysis, plastic / rubber / polymer materials measurement and analysis, metal materials measurement and analysis.

Classification method of reliability test:

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

2. The test items can be divided into environmental test, life test, accelerated test and various special tests

3. If divided according to the purpose of test research, it can be divided into screening test, identification system test and acceptance test;

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

Reliability test:

1. Lower temperature limit working test: the test sample shall be powered on and run the test procedure for preliminary test. When the test sample is not working, 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 should 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.

2. For 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 is not working, take out the sample and return to the room temperature, and then restore it for 2h. Power on and run the test procedure for inspection. The function and operation of the test sample should be normal without obvious deviation in appearance. In order to prevent the test sample from frosting and condensation during the test, the test sample is allowed to be sealed with polyethylene film before the test. If necessary, moisture absorbing agent can also be installed in the sealing sleeve.

3. The test sample of the upper temperature working test shall be subject to the preliminary test 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 should 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. For 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.

The above is the content of the reliability test project introduced to you. If you don't know anything about it, please come to the official website of Chuangxin testing for consultation. Shenzhen Chuangxin Online Testing Technology Co., Ltd. is a well-known professional testing organization for electronic components in China. It has three standardized laboratories with an area of more than 1000 square meters. The scope of testing services covers: testing and verification of electronic components, identification of IC authenticity, product design, material selection, failure analysis, function testing, factory incoming material inspection, X-ray testing of components, tape braiding and other testing items.