EMC (Electro MagneTIc CompaTIbility)-Electromagnetic compatibility refers to the ability of electronic and electrical equipment or systems to work normally according to design requirements in the expected electromagnetic environment. It is also an important technical performance of electronic and electrical equipment or systems. From a global perspective, the issue of electromagnetic compatibility has become a new discipline, and it is also a fringe science based on electromagnetic field theory, including information, electrical engineering, electronics, communications, materials, structure and other disciplines. It is also a practice. Relatively strong disciplines require product engineers to have rich practical knowledge. The central topic of electromagnetic compatibility is to study how to control and eliminate electromagnetic interference, so that when electronic equipment or systems work in conjunction with other equipment, it will not cause the deterioration or reduction of the performance of any part of the equipment or system. An ideally designed electronic device or system should neither emit any undesired energy, nor should it be affected by any undesirable energy. Of course, before an electronic device or system leaves the factory, the main basis for judging its EMC performance is the FMC test result. These tests are to simulate some harassment and interference in the actual working environment of the product, as shown in the figure. At present, measuring the EMC performance of a product is mainly considered from the following two aspects. Figure some harassment and interference occurred in the actual working environment of the product (1) EMI (Electro MagneTIc Interference)-electromagnetic interference performance. That is, when the equipment or system in a certain environment is operating normally, it should not produce electromagnetic energy that exceeds the requirements of the corresponding standards. Such electromagnetic interference includes: â—Electromagnetic disturbance conducted from the power cord; â—Disturbance conducted from signal lines and control lines; â—The harassment radiated from the product shell (including all cables in the product); â—Harmonic current conducted from the power port (Harmonic); â—Voltage fluctuation and flicker (FluctuaTIon and Flicker) generated by the power port. (2) EMS (Electro MagneTIc Susceptibility)-electromagnetic immunity performance. That is, when the equipment or system in a certain environment is operating normally, the equipment or system can withstand various types of electromagnetic energy interference. This electromagnetic energy interference mainly includes: â—Electrostatic discharge; â—The electrical fast transient pulse group of the power port; â—Electric fast transient pulse group of signal line and control line port; â—Surge and lightning strike on the power port; â—Surge and lightning strikes at the ports of signal lines and control lines; â—Electromagnetic radiation transmitted from space to the product shell; â—Conduction interference from the power port; â—The voltage drop and interruption of the power port. EMC design is the use of certain design skills and additional technical means to improve the EMC performance of the product (including the anti-interference ability of the product and the anti-interference level of the product) in the product design process, and can follow the product design in a certain environment Expect normal operation. In order to measure the EMC performance of the product before it reaches the actual application environment, an EMC test is required. Corresponding to the FMC indicators of the above products, EMC testing usually has the following two aspects. (1) EMI electromagnetic interference test â—Power line conduction disturbance (CE) test; â—Signal and control line conduction disturbance (CE) test; â—Radiation disturbance (RE) test; â—Harmonic current (Harmonic) chanting; â—Voltage fluctuation and flicker (Fluctuation and Flicker) test. (2) EMS electromagnetic immunity test â—Electrostatic discharge (ESD) immunity test; â—Electrical fast transient pulse group (EFT/B) immunity test of power port; â—Electrical fast transient pulse group (EFT/B) immunity test of signal line and control line; â—Surge and lightning test of power port; â—SURGE and lightning test of signal lines and control lines; â—Shell radiation immunity (RS) dam; â—Conducted immunity (CS) test of power port; â—Conducted immunity (CS) test of signal lines and control lines; â—The voltage drop and interruption test (DIP) of the power port. For automobiles and in-vehicle electronic equipment, due to the relatively special electromagnetic environment and power supply environment, the EMC test is also relatively special, but it can also be divided into two categories: EMI test and EMS test. It highlights the importance of ISO, CISPR and SAEJ standards. There are two specific FMC test items. (1) EMI test â—Comply with CISPR25 (corresponding to the national standard of GB18655), CISPR12 (corresponding to the national standard of GB14023), SAEJ551/5 (corresponding to the national standard of GB18387) standard radiation disturbance test; â—Conducted coupling/transient emission disturbance test conforming to CISPR25 (corresponding to the national standard GB18655) standard. (2) EMS test â—Conform to the power line conduction coupling/transient immunity test specified in the 1507637-1/2 standard; â—Conducted coupling/transient immunity test of sensor cable and control cable in accordance with 1507637-3 standard; â—Comply with the radio frequency conducted immunity test specified in 150114527 (corresponding to the national standard GB17619); â—Comply with the radiated field immunity test specified in 15011452-2 (corresponding to the national standard GB17619); â—Comply with 15011452-3 (corresponding to the national standard GB17619) standard for the radiation field immunity test of the transverse electromagnetic wave (TEM) chamber; â—Comply with the large current injection (BCI) immunity test specified in 15011452-4 (corresponding to the national standard GB17619); â—Comply with 15011452-5 (corresponding to the national standard GB17619) for the strip line immunity test; â—Comply with the three-plate immunity test specified in the standard 15011452-6 (corresponding to the font mark GB17619); â—Comply with the electrostatic discharge immunity test of 15010605 standard. EMC design cannot exist alone like hardware circuit design, structural design, software design and other design activities. It is attached to other design activities of the product. If it is necessary to classify EMC design activities, it mainly includes: (1) EMC standards and demand analysis of products; (2) FMC design of the product's mechanical structure, including the design of the cable part of the product; (3) FMC design of circuit schematic; (4) EMC design of PCB; (5) Improvement of problems in the EMC testing process.
USB Flash Drives Compatible iPhone/iOS/Apple/iPad/Android & PC 128GB [3-in-1] Lightning OTG Jump Drive 3.0 USB Memory Stick
1. 3-in-1 OTG USB flash drive for PC, iPhone, Android, Type C
Iphone Ios Usb Flash Disk,Portable 2 In 1 , 3 in 1 Usb Pendrive,Otg Usb Flash Drives,Portable Otg Usb Flash Disk MICROBITS TECHNOLOGY LIMITED , https://www.hkmicrobits.com
2. USB 3.0 + Android + IOS interface;
3. Capacity from 16~128GB;
4. Auto-run Function is optional;
5. Bootable Function;
6. Built-in Password Protection;
7. High speed Performance;
8. Data transfer rate for Read is from 12MB/s to 25MB/s, for Write is 4MB/s to 14MB/s in Dual-channel mode;
9. Data transfer rate for Read is from 8MB/s to 15MB/s, for Write is 2MB/s to 8MB/s in Single-channel mode;
(The rate of performance depends on the different operation system available and various flash adopted).
10. Operation Systems supported: No driver needed in Windows ME, Windows 2000, Windows XP, Mac 9.x or later, Linux Kernel 2.4 or later. Only Windows 98 and Windows 98SE need the enclosed driver;
11. 10 years data retention;
12. More than 1,000,000 times data encryption;
13. Built-in Password Protection is optional (default setting: NO password function);
14. Auto-run Function is optional (default setting: NO auto-run function);
15. Bootable Function is optional (default setting: NO bootable function);
16. ReadyBoost Function under Windows Vista system is optional (default setting: NO readyboost function).