Reliability analysis national standard for reliability test of electronic products

Date：2022-06-06 15:36:23 Views：1163

Generally speaking, the test to evaluate and analyze the reliability of electronic products is called reliability test. Through the reliability test, the reliability characteristic quantity of electronic products working or stored under various environmental conditions can be determined, providing useful data for use, production and design; It may also expose problems in the design, raw materials and process of the product.

The purpose of an electronic equipment reliability test is usually to:

1. in the development stage, it is used to expose the defects in all aspects of the trial product, evaluate the reliability of the product, and achieve the predetermined indicators;

2. provide information for monitoring the production process at the production stage;

3. determine or accept the reliability of finalized products;

4. expose and analyze the failure rules of products under different environments and stress conditions, as well as relevant failure modes and mechanisms;

5. in order to improve the reliability of products and provide basis for users to select products, formulate and improve the reliability test scheme.

Generally, reliability tests can be divided into five categories:

A. Environmental test B. life test C. screening test D. field service test E. qualification test.

Reliability test standard:

Environmental testing of electrical products Part 2: Test methods Test FC and guiding principles: vibration (sinusoidal) gb/t2423.10-2008/iec60068-2-6:1995.

Environmental testing of electrical products - Part 2: Test methods Fh: broadband random vibration (digital control) and guidelines gb/t2423.56-2006/iec60068-2-64:1993.

Electrical and electrical environmental tests Part 2: Test methods Test fi: vibration mixed mode gb/t2423.58-2008/ec60068-2-80:2005.

Inspection of packaging - basic inspection - Part 7: sinusoidal constant frequency vibration test method gb/t4857.7-2005/iso2247:2000.

Qc/t413-2002 basic specification for automotive electrical equipment.

Military equipment laboratory environmental test methods Part 16: vibration test gjb150.16a-2009.

Gjb367a-2001 general specification for military communication equipment

Gjb322a-1998, general rules for military computers.

Gjb3947a-2009 general specification for military electronic test equipment

Test methods and procedures for microelectronic devices gjb548b-2005.

Electrical and electrical component test methods gjb360b-2009.

Environmental stress screening method for electronic devices gjb1032-1990.

Environmental test for marine electronic equipment vibration test gjb4.7-1983.

Vibration test method for rail transit signal equipment tb/t2846-1997.

Electronic equipment for railway rolling stock gb/t25119-2010/iec60571:2006.

Inspection basis of packaging and transport packaging: Part 23: random vibration test method gb/t4857.23-2012.

Impact and vibration test for railway rolling stock equipment gb/t21563-2008iec6137:1999.

Gb/t6587-2012 general specification for electronic measuring instruments.

Reliability can be divided into three categories:

(1) Intrinsic reliability

Intrinsic reliability is the inherent reliability of a product in design. For component products, the quality of raw materials, manufacturing process and working parameters will affect its inherent reliability. For electronic products, their essential attributes depend on the complexity of the product Selection and use of circuits and components Working parameters, reliability, mechanical structure and manufacturing process of components. In general, the more complex the circuit and structure, the more components used, and the more machining processes, the lower the inherent reliability.

(2) Service reliability

Reliability refers to the influence of use and maintenance personnel on product reliability. Whether the use and maintenance procedures are correct Reasonable equipment selection Whether the operation method is appropriate and other human factors. Reliability depends largely on the user of the instrument. Skillful and correct operation. Timely maintenance and repair can greatly improve the reliability of the product. Application reliability is directly related to man-machine engineering design.

(3) Adapt to the environment

Environmental adaptation refers to the reliability of products, including the natural environment Mechanical environment, electromagnetic environment, etc. to improve the environmental adaptability of the equipment, it is mainly to take various effective protection measures.

Main reliability factors of electronic devices.

Generally speaking, the reliability of electronic products depends on their service life. The longer the average life of electronic devices, the higher the reliability of electronic devices. However, reliability and service life are not the same concept. Electronic products have high reliability, not necessarily long service life, and the reliability of long service life is not necessarily very high, which is related to the use requirements.

The main factors affecting the reliability of electronic products are:

(1) Natural environment

Electronic devices are greatly affected by environmental factors, such as temperature, humidity, salt fog, air pressure, altitude, air pollution particles, etc. Will affect the normal operation of electronic components, reduce their electrical performance, or even damage components and lead to failure.

(2) Mechanical construction

The mechanical structure design of electronic devices should meet the requirements of service conditions. Strong mechanical vibration or collision will cause mechanical damage and deformation to the equipment, and even cause physical damage or failure of electronic components, making them unable to work normally.

(3) Electromagnetic environment

Electromagnetic waves are everywhere in the environment. When electronic products are running, they are always in contact with electromagnetic signals in space. Affected by the electromagnetic wave signal, the noise of the electronic circuit will become larger and the stability will become worse. If the interference is serious, it will even cause equipment operation failure or endanger personal safety.

(4) Assembly process

In addition to component quality and design factors, the manufacturing process will also directly affect the reliability of products. The inconsistency of assembly process will directly affect the firmness, sealing and environmental corrosion resistance of connections, thus affecting the quality and reliability of electronic products.

In fact, in addition to the use reliability, the internal reliability and environmental adaptability of electronic products are determined by the design and manufacturing process, that is, after manufacturing, the main reliability indicators of electronic devices have been determined, and the external environment is only a test of their reliability. Therefore, the key to improving the reliability of electronic products is to improve the design and manufacturing level.