Electronic product inspection is the evaluation of conformity of electronic products through observation and judgment, combined with measurement and testing when appropriate.
Today, let's take a look at the key points of electronic product inspection with a comprehensive survey?
The overall inspection of electronic products is to observe, measure, and test according to the technical requirements of the entire machine, and compare the results with the specified requirements to determine the qualification of various indicators of the entire machine.
Detection classification
(1) Full inspection. It refers to 100% inspection of all products one by one. Based on the testing results, make a judgment on whether the inspected individual product is qualified or not.
(2) Spot check. It is the process of extracting some samples from the inspection batch for inspection, and based on the inspection results, determining the quality level of the entire batch of products, in order to draw a conclusion whether the product is qualified.
Testing items
(1) Performance. Performance refers to the technical characteristics that a product possesses to meet its intended use, including its performance, mechanical properties, physicochemical properties, 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 life of the product, Failure rate rate, average maintenance interval, etc.
(3) Security. Safety refers to the degree to which a product ensures safety during operation and use.
(4) Adaptability. Adaptability refers to the ability of a product to adapt to natural environmental conditions, such as temperature, humidity, acidity, and alkalinity.
(5) Economy. Economy refers to the cost of a product and the cost of maintaining normal work.
(6) Timeliness. Timeliness refers to the timely entry of products into the market and the timely provision of technical support and maintenance services after sales.
We will mainly take a look at sample testing of electronic products, including life testing and environmental testing. Life test is an experiment that examines the regularity of product life and is the final stage of product testing. It is a test conducted by simulating the actual working and storage status of a product under specified conditions and inputting a certain sample. During the test, the failure time of samples shall be recorded and statistically analyzed to evaluate the reliability quantitative characteristics of products such as reliability, Failure rate and average life. At the same time, in order to ensure the production quality of electronic complete machine products, it is usually necessary to conduct electrical aging of the entire machine after assembly, debugging, and inspection. Aging test is to continuously operate the entire product for several hours under certain environmental conditions, and then test whether the product's performance still meets the requirements. Aging can reveal potential defects in the manufacturing process of the product. The aging test includes the following factors: 1. Determination of aging conditions: time, temperature 2. Static aging and dynamic aging (1) Static aging: If only the power is turned on and no signal is injected into the product, this state is called static aging; (2) Dynamic aging: When an electronic complete machine product is connected to the power supply and also inputs a working signal to the product, this state is called dynamic aging.
Environmental testing: A method of testing a product's ability to adapt to the environment, which is a test that evaluates and analyzes the impact of the environment on product performance. It is usually conducted under simulated natural conditions that the product may encounter. The content of environmental tests includes mechanical tests, climate tests, transportation tests, and special tests.
1. Electronic products with different mechanical tests will be subjected to varying degrees of vibration, impact, centrifugal acceleration, as well as mechanical forces such as collision, sway, static compliance, and explosion during transportation and use. This mechanical stress may cause changes or even damage to the electrical parameters of internal components in electronic products. The main items of mechanical testing are as follows:
(1) Vibration test: Vibration test is used to check the stability of the product under vibration.
(2) Impact test: Impact test is used to check the adaptability of products to non repetitive mechanical impacts. The method is to fix the sample on an electric shock vibration table and use it at a certain frequency to impact the product several times in different directions. After the impact, check whether the main technical indicators still meet the requirements and whether there is mechanical damage.
(3) Centrifugal acceleration test: Centrifugal acceleration test is mainly used to check the integrity and reliability of product structure.
2. Climate test is a measure taken to check the design, process, and structure of a product to prevent or mitigate the impact of adverse weather conditions on raw materials, components, and overall machine parameters. Climate testing can identify the problems and causes of products, in order to take protective measures and improve the reliability and adaptability of electronic products to harsh environments. The main projects of climate testing are as follows: (1) High temperature testing: used to examine the impact of the environment on products and determine the adaptability of products to work and store under high temperature conditions. (2) Low temperature test: used to check the impact of low temperature environment on products and determine the adaptability of products to work and storage under low temperature conditions. (3) Temperature cycling test: it is used to check the bearing capacity of the product to resist the drastic change of temperature in a relatively short period of time, and whether the material cracks, poor contact of connectors, deterioration of product parameters and other failures are caused by Thermal expansion. (4) Humidity test: used to check the impact of humidity and temperature on electronic products, and to determine the experimental performance of products in working and storage under humid and hot conditions. (5) Low-pressure area test: used to check the impact of Low-pressure area on product performance.
3. Transportation experiments are conducted to test the adaptability of products to packaging, storage, and transportation environmental conditions. The transportation test can be conducted on a test bench that simulates transportation vibration, and the figure shows several simulated transportation vibration test benches. Direct driving tests can also be conducted.
4. Special tests check the product's ability to adapt to special working environments. Special tests include smoke test, dust test, mold resistance test, and radiation test.
Post time: Aug-07-2023