esd grounding

climate, but the daily life of the ESD phenomenon also occurs frequently. With the progress of network equipment chip technology, the speed and function of the chip can be improved, but the chip becomes more fragile. A not too high ESD voltage can penetrate the transistor, a not too large ESD current can fuse the connection. Since static electricity is the invis

compatibility standards. To protect each device from any electromagnetic interference, the cost will be very high. This is the first step in the design to determine the level of protection required and evaluate the electromagnetic environment of the equipment. Radiation The time-varying Charge Distribution and current will generate electromagnetic waves. All electrical and electronic devices and systems contain wires that support time-varying currents and voltages. Therefore, more or less elect

On printed circuit boards, power cords and ground wires are the most important. The main method to overcome electromagnetic interference is grounding. For the dual panel, the ground line layout is particularly exquisite. By using the single point grounding method, the power supply and ground are connected from both ends of the power supply to the printed circuit board. The power supply is one point, one poi

really do the whole screen. At the same time, shielded cable shielding layer of low frequency magnetic shielding effect is poor, can not resist such as motor and other equipment produced low-frequency interference. Therefore, the use of shielded cable can not completely eliminate electromagnetic interference. Theoretically speaking, in order to reduce the outside world, shielding measures can be used to shield both electrostatic shielding and magnetic shielding. The principle of shielding is t

the low-frequency magnetic field and cannot resist the low-frequency interference caused by equipment such as motor. Therefore, shielding Cables cannot completely eliminate electromagnetic interference. Theoretically, in order to reduce the external world, shielding measures can be used to shield static shielding and magnetic shielding. The shielding principle is that the interference current is short-circuited to the ground after the shielding layer is grounded. Therefore, it is very important

capacitance, and C is the capacitance of the transmission medium (cable or PCB cabling) unit length. The preceding figure shows the functional relationship between the minimum device spacing and the distributed media and the total load resistance. Figure 7 shows this relationship graphically. Figure 7: Relationship between the minimum node spacing and the device and the transport medium capacity. The load capacitance includes the capacitance of the Line Bus pin, the contact capacitance of th

interference and frequency low amplitude interference of the General Electric apparatus. Safety inspection of integrated wiring grounding system When the integrated wiring system adopts shielding measures, it must have a good grounding system and conform to the following regulations: (1) Protection ground grounding resistance value, the separate

silicone three-part, and some buttons between the key cap assembly and the bracket with a light-shielding paper to prevent light transmission between the keys. Stent material according to the key thickness, can be used PC or ABS injection molding, thickness in 0.8-2.0mm; You can also use PC sheet directly blanking, thickness of 0.5, 0.6 or 0.7mm; When the key thickness is not enough, the bracket material with 0.15mm thick stainless steel sheet, but considering the

In our DIY long "levy Machine" on the road, there has been the disaster of static electricity, I was deeply affected by static electricity, hard to explore, to find the way to eliminate static electricity, the following article on how I eliminate static electricity "suffering" experience, I hope to give you a little help. Remember the computer just assembled back, the use is very normal, once accidentally touched the chassis rear panel (chassis in addition to the rear panel bare, the other part

be worse than that provided by the unshielded system. Part 1 installation of the shielded Cabling System The installation of the shielded wiring system mainly involves two aspects: the floor wiring room and the work area shielding cable terminal and system grounding. In view of the particularity of the shielding system, it is necessary to ensure that the Screen Layer of the cable is in good contact with the Screen Layer of the module and the distribu

security. For a shielded cabling system, we need to pay attention to the following two points during design and construction: 1. The function of the shielded cabling system requires that all connected hardware use shielded products, including transmission cables, distribution frames, modules, and jumpers. 2. The shielded cabling system must be correctly and properly grounded. If the shielding layer of each connection element of the transmission channel is discontinuous or poorly grounded, the t

In the first year as an electronic engineering student, you've been told repeatedly that electrostatic discharge (ESD) is a phenomenon of electrical transients and poses a serious threat to electronic circuitry. The most common reason for electrostatic generation is that the friction between the two different materials causes the charge to accumulate on the friction surface. The use of handheld and wearable electronic devices continues to grow, involv

of lightning disasters Lightning strikes can generate different forms of damage. The International Electrotechnical Commission has called lightning disasters a "major environmental hazard in the electronic age ", transient overvoltage, such as lightning strikes, inductive lightning strikes, and power sharp waves, has become the culprit in damaging electronic devices. From the analysis of a large number of lightning strikes on communication equipment, experts believe that lightning electromagnet

classification and prevention of lightning disasters Lightning strikes can generate different types of damages. The International Electrotechnical Commission has called lightning disasters a "major environmental hazard in the electronic age ", transient overvoltage, such as lightning strikes, inductive lightning strikes, and power sharp waves, has become the culprit in damaging electronic devices. From the analysis of a large number of lightning strikes on communication equipment, experts belie

classification and prevention of lightning disasters Lightning strikes can generate different types of damages. The International Electrotechnical Commission has called lightning disasters a "major environmental hazard in the electronic age ", transient overvoltage, such as lightning strikes, inductive lightning strikes, and power sharp waves, has become the culprit in damaging electronic devices. From the analysis of a large number of lightning strikes on communication equipment, experts belie

shielding, grounding theory and product line, to provide the most complete, most comprehensive cable, components and end-to-end total shielding solutions to meet the growing needs of today's network. Of course, the current industry on the shielding wiring system, some of the controversy may also make the user is not very understanding of shielding system. The shielding principle of the FTP cable is different from the balance cancellation principle o

to consider electrical characteristics such as EMI, EMC, ESD, and signal integrity, as well as the heat dissipation of mechanical structures and high-power chips, on this basis, consider the appearance of the circuit board. Therefore, PCB layout is an art, specifically an art of door compromise. Before learning to explore PCB wiring, you may see a variety of PCB wiring rules in a variety of reference books, even if many rules have the same meaning to

Sender: gdtyy (gdtyy), email area: embeddedQuestion: How to Improve easyarm2200 Hardware DesignMailing station: shuimu community (Mon Jun 25 23:42:42 2007), within the station Several improvements to easyarm2200 Hardware Design I recently used easyarm2200 to learn about arm development and found some problems and many improvements to this board. HopeThese suggestions can help you turn the Development Board into a product. ====* Hole *====Four installation holes of easyarm2200 are incorrect. The

. Some buttons also add a shadow paper between the keycap component and the bracket to prevent transmission between the buttons. The bracket material is determined based on the button thickness. It can be injection molded with PC or ABS, with a thickness ranging from 0.8 to 2.0mm. Alternatively, it can be directly punched out with PC sheet with a thickness of 0.5, 0.6 or 0.7mm; when the button thickness is not enough, the bracket material is made of 15mm mm thick stainless steel, but considering

Commission has called the Lightning Disaster "the electronic era of a major public nuisance," Lightning, induced lightning, power supply, such as sharp wave of instantaneous overvoltage has become the culprit of electronic equipment damage. From a large number of communications equipment in the Lightning case analysis, experts believe that: Lightning induction and lightning wave intrusion caused by the Lightning Electromagnetic pulse (LEMP) is the main reason for the damage of communications eq