Date：2021-09-14 14:31:39

At present, nondestructive testing (NDT) technology is widely used. The structural integrity and safety of almost all components, especially the most critical components, need to be verified. NDT plays a very important role in it. NDT technology is required in almost all manufacturing, service, maintenance or overhaul inspection fields. Five conventional NDT principles, NDT technology does not damage parts or materials, can be tested directly on site, and has high efficiency. There are five most commonly used NDT methods: UT (ultrasonic testing), RT (radiographic testing) and MT (magnetic particle testing) View >>

Date：2021-09-14 14:24:00

Modern nondestructive testing technology can be simply divided into two categories: surface nondestructive testing and near surface nondestructive testing. Surface nondestructive testing technology is a technology used to detect product surface defects, such as fluorescent penetrant testing. It can effectively locate cracks or other types of defects on the surface. Near surface nondestructive testing technology is used to detect defects below the surface. Including ultrasonic testing, laser testing and radiographic testing. There are many kinds of nondestructive testing methods, most of which can be divided into two categories: surface and internal testing. Surface detection methods are used to detect defects and anomalies on or very close to the surface. The two most commonly used methods are penetration detection and laser shear imaging. View >>

Date：2021-09-14 14:19:07

The test report should be tested by relevant testing institutions. Generally, the testing institutions need to have CMA and CNAs qualifications to produce effective test reports. According to Article 19 of the product quality law of the people's Republic of China, product quality inspection institutions must have corresponding testing conditions and capabilities, and can undertake product quality inspection only after passing the examination by the market supervision and administration department or its authorized department of the people's government at or above the provincial level. Where there are other provisions on product quality inspection institutions in laws and administrative regulations, the provisions of relevant laws and administrative regulations shall prevail. So how to deal with the test report of general electronic components? What are the requirements? View >>

Date：2021-09-13 16:03:00

Now ROHS certification has been upgraded to rohs2 0, not only the EU ROHS has been upgraded, but also China's RoHS has been upgraded to rohs2. There are ten RoHS tests, which can be generally divided into four, six and ten. RoHS1. 0 is the old version 2002 / 95 / EC, rohs2 0 is the current 2011 / 65 / EU, the revision is 2015 / 863, not rohs3 0 EU rohs2 How many items are detected in 0? 2011 / 65 / EC Directive is changed to rohs10 items: lead (PB), cadmium (CD), mercury (Hg), hexavalent chromium (Cr6 +), polybrominated biphenyls (PBBs) and polybrominated diphenyl ethers (PBDEs), di-n-butyl phthalate (DBP), o-benzene View >>

Date：2021-09-13 15:52:00

With the rapid growth of electronic and electrical equipment, a large number of electronic waste is also increasing rapidly. In order to control the pollution of electronic and electrical waste to the ecological environment, different countries or regions have promulgated relevant laws and regulations to control it. Among them, the EU directive rohs2 on the restriction of 10 categories of hazardous substances in motor and electronic products 0. From July 22, 2019, all electronic and electrical products exported to Europe (except medical and monitoring equipment) shall meet this restriction. RoHS is the environmental protection certificate for products and materials entering the EU market. This directive is a mandatory requirement. Products or materials involved in this directive will not be able to enter the market without ROHS environmental protection certificate. RoHS2. The implementation of 0 is related to the interests of electronic and electrical appliance manufacturers exporting to the EU, so let's take a look today View >>

Date：2021-09-13 15:15:00

IGBT is a composite fully controlled voltage driven power semiconductor device composed of bipolar transistor and insulated gate field effect transistor. It has two advantages: high input impedance of MOSFET and low on voltage drop of GTR. View >>

Date：2021-09-13 15:12:00

When a small amount of impurities are doped into a semiconductor, the periodic potential field near the impurity atom is disturbed, forming an additional bound state and generating an additional impurity level in the band gap. The impurity that can provide electron carriers is called donor impurity, and the corresponding energy level is called donor energy level, which is located above the forbidden band and near the bottom of the conduction band. View >>

Date：2021-09-13 11:21:00

Performance test generally refers to function test. It mainly tests the functions of the equipment and whether the fixed parameters meet the regulations. Performance test is to test various performance indexes of the system by simulating a variety of normal, peak and abnormal load conditions through automatic test tools. Both load test and stress test belong to performance test, which can be carried out in combination. Function test is to verify the functions of the product, test item by item according to the function test cases, and check whether the product meets the functions required by users. View >>

Date：2021-09-13 11:14:00

Chip burning is an important link in the production of electronic products. The efficiency is an important aspect of customer concern. How to judge whether the IC has been burned? The burning efficiency is inseparable from the burning speed of the chip. The principle of chip programming is explained. The principle of single chip microcomputer burning is that a burning program already exists in single chip microcomputer. When starting the single chip microcomputer, first run the program to judge the port state. If the state of "to burn ROM" exists, read the data from a port (serial port, SPI, etc.) and then write it into the ROM of the single chip microcomputer. If there is no "to burn ROM" status, go to the user's program and start execution. View >>

Date：2021-09-10 17:16:35

IC is an integrated circuit, referred to as chip for short. All enterprises engaged in the production of electronic products will use IC, but IC is divided into active chips that need to be burned and passive chips that do not need to be burned. In all cases where active chips are needed, IC burning is required. However, if the general chip is not a single chip microcomputer or programming chip, it does not need to be burned. Such chips as single chip microcomputer or arm need to be burned. Let's take a look at the specific introduction. View >>