0欧电阻究竟有什么作用呢

0欧电阻究竟有什么作用呢 We often see the resistance of the 0 ohm in the circuit. For the novice, it is always confused: since it is the resistance of 0 ohm, that is the wire. Why should we install it? Are there any such resistors available on the market? In fact, the resistance of 0 ohm is still very useful. About the following functions: Use as jumper. The utility model has the advantages of beautiful appearance and convenient installation. In digital and analog hybrid circuits, two separate and single point connections are often required. We can connect these two places with a 0 ohm resistor, not directly together. The advantage of this is that the ground wire is divided into two networks and will be much more convenient when handling copper in a large area. By the way, such occasions are sometimes connected by inductors or magnetic beads. Work as a fuse. Because the fuse current on the line of PCB is larger, it will be difficult to fuse if there is a fault such as short circuit, over-current and so on, which may lead to greater accidents. The 0 ohm current capability is relatively weak (in fact, 0 ohm also has a certain resistance, is very small, only) when the flow on the first 0 ohm resistor fuse, the circuit is disconnected, prevent the occurrence of more accidents. Sometimes a small resistance with zero resistance or a few ohm is used as a fuse. However, this is not recommended, but some vendors will use it in order to save costs. Position reserved for debugging. You can decide whether to install, or any other value, as needed. Sometimes it is marked by *, indicated by debug decisions. Use as configuration circuit. This function is similar to the jumper or dial switch, but is fixed by welding, thus avoiding the modification of the configuration by the ordinary user at will. By installing resistors at different locations, you can change the function of the circuit or set the address. 0 Ohm's resistance is not only sold, but also different specifications, usually in terms of power points, such as 1/8 watts, 1/4 watts, and so on. Other answers Use as jumper. The utility model has the advantages of beautiful appearance and convenient installation. In digital and analog hybrid circuits, two separate and single point connections are often required. We can connect these two places with a 0 ohm resistor, not directly together. The advantage of this is that the ground wire is divided into two networks and will be much more convenient when handling copper in a large area. By the way, such occasions are sometimes connected by inductors or magnetic beads. Work as a fuse. Because the fuse current on the line of PCB is larger, it will be difficult to fuse if there is a fault such as short circuit, over-current and so on, which may lead to greater accidents. The 0 ohm current capability is relatively weak (in fact, 0 ohm also has a certain resistance, is very small, only) when the flow on the first 0 ohm resistor fuse, the circuit is disconnected, prevent the occurrence of more accidents. Sometimes a small resistance with zero resistance or a few ohm is used as a fuse. However, this is not recommended, but some vendors will use it in order to save costs. Position reserved for debugging. You can decide whether to install, or any other value, as needed. Sometimes it is marked by *, indicated by debug decisions. Use as configuration circuit. This function is similar to the jumper or dial switch, but is fixed by welding, thus avoiding the modification of the configuration by the ordinary user at will. By installing resistors at different locations, you can change the function of the circuit or set the address. 0 Ohm's resistance specifications, usually divided by power, such as 1/8 watts, 1/4 watts, and so on. 1, analog and digital single point grounding As long as it is, we must finally get together, and then into the earth. If not put together is "floating ground", there is pressure difference, it is easy to accumulate electricity, causing static electricity. The ground is referenced to the 0 potential, and all voltages are derived from the reference ground. The ground standards shall be consistent, so the ground shall be shorted together. It is believed that the earth can absorb all the charges and always remain stable, and is the ultimate ground reference point. Although some boards do not take the ground, the power plant is grounded, and the power on the board will eventually return to the power plant. If the analog and digital large area directly connected, will lead to mutual interference. There are four ways to solve this problem: connect it with magnetic beads; connect with a capacitor; connect with an inductance; connect with a 0 ohm resistor. The equivalent circuit of magnetic equivalent bandstop limiter, only to a certain frequency noise significantly inhibited, the need to use pre estimated noise frequency, in order to choose the appropriate model. For frequencies that are uncertain or unpredictable, magnetic beads are incompatible. The capacitor passes straight through to make a floating ground. The inductance is large, and the stray parameters are unstable. The 0 ohm resistance is equivalent to a narrow current path, which can effectively limit the loop current and suppress noise. Resistance is attenuated on all frequency bands (0 ohm resistance also has impedance), which is stronger than magnetic beads. 2, when the jumper for current loop when the electrical ground plane segmentation, shortest path signal caused by the reflux fracture, at this time, the signal loop had to detour to form a loop area of great influence, the electric field and the magnetic field becomes strong, easy interference / interference. A 0 ohm resistance across the split section can provide a shorter recirculation path to minimize interference. 3, configuration circuit in general, products do not appear jumper and dial code switch. Sometimes users will tamper with settings, easily lead to misunderstanding, in order to reduce maintenance costs, the use of 0 ohm resistors instead of jumpers and other welding on the board. The vacant jumper is equivalent to the antenna at high frequencies and is good with patch resistors. 4, use wiring cross line debugging / testing: at the beginning of design, to a series resistor is used for debugging, but can not determine the specific value, with such a device to facilitate the subsequent circuit debugging, debugging if the results do not need to add resistance, just add a 0 ohm resistance. Temporary replacement of other patch devices as a temperature compensation device, more often due to the needs of EMC countermeasures. In addition, the 0 ohm resistance is smaller than the parasitic inductance of the vias, and the vias also affect the ground plane (because holes are to be dug). 1, there is no function in the circuit, just for the sake of debugging convenience or compatibility design on the PCB. 2, you can do the jumper, if a section of the line does not use, do not directly paste the resistance can (without affecting the appearance) 3, when the parameters of the matching circuit are uncertain, 0 ohm is used instead of the actual debugging time, Determine the parameter, and then replace the element with the specific value. 4, when you want to measure the current consumption of a part of the circuit, you can remove the 0ohm resistor and connect the ammeter, which is convenient for measuring the current consumption. 5, in wiring, if the cloth does not pass, you can also add a 0 ohm resistance 6, acting as an inductor or capacitor under high frequency signals. (with respect to the characteristics of external circuits) inductance is used primarily to solve the EMC problem. Such as ground and ground, power supply and IC Pin 7, the single point grounding means the protection of the ground, the work, the ground, the DC ground, and the equipment are separated from each other, and each becomes an independent system. 8 fuse action "Compensation resistance" is used on many occasions, and its function is very different. However, the more common is the "temperature compensated resistor"". The utility model is mainly used for compensating the influence of the environmental temperature change when measuring, and measuring the error produced by the component itself (the voltage signal measured is changed). Because the resistance of many conductors increases with the temperature, the electrical signals produced by the measuring elements are affected by the measurement and transmission process. In order to compensate the measuring element voltage signal change with temperature compensation method can be used to bridge, the principle is the three bridge arm bridge with three standard resistor placed in constant temperature, and compensation resistance with a change of resistance with temperature change for another arm bridge the. In this way, when the temperature changes, both ends of the bridge will produce a certain voltage, and if designed well, this voltage can be exactly equal to the change of the voltage signal produced by the temperature change of the measuring element. By compensating the signal of the compensating bridge and the measurement signal, the effect of temperature change can be compensated. In order to reduce the temperature coefficient of resistance of transmission lines, can be connected in series with a "negative temperature coefficient" compensation resistance in a transmission circuit (the resistance decreases with increasing temperature), parameter selection is good, can just keep total resistance of transmission line without change of temperature change, that is to keep the total resistance the transmission line is constant. As far as other compensation resistors are concerned, the principle is approximately the same, and it will not go into details.