Date：2022-04-20 17:43:09

Nondestructive testing is a test method to check the surface and internal quality of the inspected parts without damaging the working state of the workpiece or raw materials. Use the acoustic, optical, magnetic and electrical characteristics to detect whether there are defects or non-uniformity in the tested object, give the information such as the size, location, nature and quantity of defects, and then determine the general name of all technical means of the technical state of the tested object (such as qualified or not, remaining life, etc.). In order to help you have an in-depth understanding, this paper will summarize the relevant knowledge of weld nondestructive testing. If you are interested in what this article will cover, read on. View >>

Date：2022-04-20 17:30:00

Weld quality standard I. guarantee item 1. The welding materials shall meet the design requirements and the provisions of relevant standards, and the quality certificate and baking records shall be checked. View >>

Date：2022-04-20 15:38:46

Switching power supply chips can be divided into AC / DC power supply chips and DC / DC power supply chips. DC / DC converters have been modularized, and the design technology and production process have been mature and standardized at home and abroad, and have been recognized by users. However, the modularization of AC / DC has encountered more complex technical and process manufacturing problems in the process of modularization due to its own characteristics. Power chip is an indispensable component of electronic equipment. If the power chip is damaged in the circuit, the electronic equipment will stop working. How to detect the quality of power chip? If you are interested in what this article is about to cover, you might as well read on. View >>

Date：2022-04-20 15:00:00

Generally, when evaluating electronic components, its safety performance should be considered from the following aspects: 1 Withstand voltage (electric strength) - prevent electric shock injury 2 Insulation resistance - prevent electric shock injury 3 Grounding resistance - prevent electric shock injury 4 Leakage current - prevent electric shock injury View >>

Date：2022-04-19 15:14:09

Before the electrical system and electrical equipment are put into use, the electrical test is to test the insulation performance, electrical characteristics and mechanical properties of each electrical equipment in the electrical system item by item according to the relevant provisions of standards, procedures and specifications, so as to timely find and eliminate the defects, errors and quality problems of electrical equipment during manufacturing and installation, and ensure that the electrical system and electrical equipment can be put into normal operation. View >>

Date：2022-04-19 15:00:00

Recently, the Ministry of ecology and environment issued the notice on the key work related to the management of enterprise greenhouse gas emission report in 2022, and updated the power generation facilities of enterprise greenhouse gas emission accounting methods and reporting guidelines (revised version in 2022) in the form of an annex to the notice. View >>

Date：2022-04-19 14:16:00

The development of modern science and technology is based on integrated circuits. The most direct goal of integrated circuit development is to integrate more transistors in unit area or unit volume. Integrated circuit technology includes chip manufacturing technology and design technology, which is mainly reflected in the ability of processing equipment, processing technology, packaging and testing, mass production and design innovation. It is represented by the letter "IC" in the circuit. Most applications in today's semiconductor industry are silicon-based integrated circuits. View >>

Date：2022-04-19 14:00:00

Electromagnetic compatibility test EMC (electro magnetic compatibility) refers to the ability of equipment or system to meet the requirements in its electromagnetic environment and not produce intolerable electromagnetic interference to any equipment in its environment. EMC test includes two aspects: test the electromagnetic disturbance intensity sent to the outside world to confirm whether it meets the limit value requirements specified in relevant standards; The sensitivity test shall be conducted under the electromagnetic environmental conditions with specified electromagnetic disturbance intensity, so as to confirm whether it meets the immunity requirements specified in relevant standards. View >>

Date：2022-04-18 15:17:10

In the circuit, the components working in the state of high voltage, high current and high power undoubtedly bear great pressure and have great possibility of damage. At the same time, they are also the key components and functional components of the circuit. The core of electronic equipment is the circuit board, which is welded and assembled by various types of electronic components. If the equipment fails or has a short circuit, most of the reasons will be caused by the failure or damage of electronic components. How to check the quality of components? Share the skills of detecting the quality of circuit board components. View >>

Date：2022-04-18 15:13:50

The components damaged by overvoltage can not see obvious specific changes from the surface, but the parameters have changed. When it is more serious, the circuit board around the components turns yellow and black. Devices are the most easily damaged items, but their faults are regular. General faults are divided into two types: electrical parameter damage and physical damage. Then the damage of electrical parameters includes the damage caused by voltage and current exceeding the rated value. Physical damage includes fracture, deformation, resistance parameter change and other manifestations. What are the phenomena of component damage? The life of electronic components is not only related to its own structure and properties, but also closely related to its service environment and its role in the circuit. View >>