Knowledge related to electronic product inspection third party testing organization

Date：2022-02-17 18:08:31Views：1299

Inspection is the conformity evaluation of electronic products through observation and judgment, combined with measurement and trial test when appropriate. Product inspection is an essential means of quality control in the production of modern electronic enterprises. It mainly plays the role of process control, quality control and judging the qualification of products. The product inspection shall implement the "three inspection" system combining self inspection, mutual inspection and full-time inspection.

Detection process

Testing can generally be divided into three stages:

(1) Inspection of assembly equipment. It mainly refers to the inspection of components, parts, outsourced parts and materials before warehousing. Sampling inspection is generally adopted.

(2) Process inspection. It refers to the inspection of one or more processes in the production process, or semi-finished products and finished products, mainly including welding inspection, unit circuit board commissioning inspection, system joint commissioning inspection after the assembly of the whole machine, etc. The process inspection generally adopts the inspection method of full inspection.

(3) Complete machine testing of electronic products. The whole machine is inspected in the way of multi-level and multiple re inspection. Generally, full inspection is adopted for warehousing and random inspection is adopted for outbound.

Electronic product testing items

(1) Performance. Performance refers to the technical characteristics of the product to meet the use purpose, including the use performance, mechanical performance, physical and chemical performance, appearance requirements, etc.

(2) Reliability. Reliability refers to the performance of the product to complete the work task within the specified time and under the specified conditions, including the average service life, failure efficiency, average maintenance interval, etc.

(3) Security. Safety refers to the degree of ensuring the safety of products during operation and use.

(4) Adaptability. Adaptability refers to the adaptability of products to natural environmental conditions, such as the response to temperature, humidity, pH, etc.

(5) Economy. Economy refers to the cost of products and the consumption cost of maintaining normal work.

(6) Timeliness. Timeliness refers to the timeliness of products entering the market and the timely provision of technical support and maintenance services after sales.

Sample test of electronic products

The test is a routine verification of finalized products or products produced for a long time in order to fully understand the special performance of products. In order to truly reflect the product quality, the sample machine for the test shall be randomly selected from the qualified whole machine. The test includes environmental test and life test.

(1) Environmental test

Environmental test is a method to test the adaptability of products to the environment. It is a test to evaluate and analyze the impact of the environment on product performance. It is usually carried out under various natural conditions that may be encountered by simulated products. The environmental test includes mechanical test, climate test, transportation test and special test.

Mechanical test includes vibration test, impact test, centrifugal acceleration test and other items.

Climate test includes high temperature test, low temperature test, temperature cycle test, humidity test and low pressure test.

Transportation test is to test the adaptability of products to packaging, storage and transportation environmental conditions.

Special test is to check the product's ability to adapt to special working environment, including smoke test, dust test, mold resistance test and radiation resistance test.

(2) Life test

Life test is a test to investigate the regularity of product life, which is the final stage of product test. It is a test that simulates the actual working state and storage state of the product under the specified conditions and puts a certain sample into the test. During the test, the failure time of the sample shall be recorded and statistically analyzed to evaluate the reliability quantitative characteristics of the product, such as reliability, failure efficiency, average life and so on.

In order to ensure the production quality of complete electronic products, the power on aging of the whole machine is usually carried out after assembly, commissioning and inspection. The so-called aging of the whole product is to let the whole product work continuously for several hours under certain environmental conditions, and then test whether the performance of the product still meets the requirements. Through aging, the potential defects existing in the manufacturing process of products can be found, and the faults (early failure) can be eliminated before leaving the factory.

Aging is a routine process of an enterprise. Usually, every product must undergo aging before leaving the factory.

1. Determination of aging conditions

The aging of complete electronic products is carried out when the power is connected. The main aging conditions are time and temperature. According to different conditions, the continuous aging time of 8h, 24h, 48h, 72h or 168h can be selected at room temperature. Sometimes, the method of increasing the indoor temperature (sealing the aging chamber so that the working heat of the product itself is not easy to dissipate, or adding an electric heater) and even putting the product into a constant temperature test chamber are adopted to shorten the aging time.

During aging, pay close attention to the working state of the product. If any abnormality is found in individual products, it shall be immediately removed from power on aging and sent to the maintenance department.

2. Static aging and dynamic aging

When aging the whole electronic product, if only the power is connected and no signal is injected into the product, this state is called static aging. If the working signal is also input to the product at the same time, it is called dynamic aging. Take the television as an example. During static aging, there is only a grating on the picture tube, while during dynamic aging, a signal is sent from the antenna input, an image is displayed on the screen, and a sound is emitted from the horn. For another example, the computer only turns on the power supply and does not run the program during static aging, while the test program should be continuously run during dynamic aging. It is obvious that dynamic aging is more effective than static aging.

The above is the relevant content of "electronic product testing" brought by the core creation test. I hope it can be helpful to you. We will bring more wonderful content in the later stage. The company's testing services cover: electronic component testing and verification, IC authenticity identification, product design and material selection, failure analysis, function testing, factory incoming material inspection, tape braiding and other testing items. Welcome to call Chuangxin testing. We will serve you wholeheartedly.