The working principle and applicable fields of shunts
In fact, shunts are very common in our lives. Almost every household uses a shunt, such as using a shunt to connect network cables. The function of a shunt is just like its name, it is mainly used to shunt large currents. The principle of making a shunt is very simple. Anyone who has learned middle school physics will understand that it is based on the principle of voltage generated at both ends of the resistor when a large current passes through the resistor. So, how much does a shunt cost? This depends on the type of shunt. If you are interested in how much a shunt costs, you might as well follow me to find out!
Introduction to taps
Network taps (Networkprobe), including commonly used 2.5G taps, 10G taps, 40G taps and test access ports (TAP), are A hardware device that plugs directly into a network cable and sends a copy of network traffic to other devices.
Working principle of the splitter
By inputting data into the network splitter, copying, aggregating, and filtering are performed, and 10G POS data is converted into Gigabit LAN data through protocol conversion. The algorithm performs load balancing output and ensures that all data packets of the same session or all data packets of the same IP user are output from the same interface while outputting.
The function of the shunt
1. General shunts
It is used to measure DC current. It is based on the principle that when the DC current passes through the resistor, a voltage is generated at both ends of the resistor. made. Shunts are widely used to expand the measuring current range of instruments. There are fixed-value shunts and precision alloy resistors, which can be used in communication systems, electronic machines, automated control power supplies and other circuits for current limiting and current sharing sampling and testing.
Ammeters come in many different specifications, but the actual meter is a standard millivolt voltmeter. For example, it is a voltmeter with a full scale of 75mv. So to use this voltmeter to measure a current of, say, 20A, you need to equip it with a shunt resistor that produces a voltage drop of 75mv when 20A current flows, also called a 75mv shunt.
2. Network splitter
It is something similar in nature to a router. Perhaps more accurately, it is a crossed network cable. Generally, network splitters only have a few holes, which are no bigger than an adult's fist. One side is for plugging in the network cable, and the other side is for connecting the computer network cable. It is usually a rectangular box with three to four interfaces on the outside. When you need to use it, connect the network cable directly. Just bad enough.
3. Hydraulic flow diverter
Hydraulic flow diverter combines multiple hydraulic pumps in a flexible and efficient way and is used in multi-circuit hydraulic systems. Each flow divider includes a series of gear pairs, which divide the input oil into several output channels in equal or proportional amounts. The working pressure of each channel can be different from each other, and each channel can be equipped with a safety relief valve.
IV. Wire shunts
Wire shunts have now become the first choice for electrical designers in various design institutes. This is mainly because this product is a national patented product and the conductor material selected for the product is The copper is tin-plated after forming to ensure that the material selected for the product is the same as the cable conductor. The connection of the conductor is surface contact, and the product's protection level reaches IP63. The wire shunt products cover a wide range of products and have various specifications and models, which can fully meet the power distribution methods under various circumstances.
How much does a shunt cost?
It depends on the type of shunt. Splitters used to answer phone calls are very cheap, ranging from a few yuan to more than ten yuan. Splitters used to connect computers are relatively expensive, generally around a hundred yuan. Nowadays, some routers can replace splitters, and some people do not install splitters at home for convenience. When purchasing a shunt, you should also pay attention and try to choose a shunt produced by a large manufacturer. The quality is guaranteed and the after-sales service is relatively timely except for problems.
Note: This price is for reference only! Due to different regions, of course prices will vary. For more relevant price details, please refer to the local dealer!
How to apply the shunt
1. How to select a shunt
(1) Select the rated voltage drop specification of the shunt according to the mV number marked on the dial of the ammeter (or current-voltage meter) used (generally commonly used is 75mV or 45mV ).
If the ammeter used does not have this value, use the following formula to calculate the voltage limit of the table, and then select the rated voltage drop specification of the shunt.
The voltage limit of the meter (mV) = the current at full scale of the ammeter (A) × the internal resistance of the ammeter (Ω) ÷ 1000 (2) Select the rated current of the shunt according to the current range to be expanded Specification.
(3) Connect the two current terminals of the selected shunt to the power supply and load respectively, and connect the potential terminal to the ammeter. It should be noted that the polarity of the terminals of the ammeter must be connected correctly, so the range of the ammeter will be expanded. The current value calibrated on the shunt has been reached.
2. Calculation method of ammeter multiples after using shunts
For motor test measurements, one ammeter is often equipped with multiple shunts to solve the problem of ensuring the required measurement accuracy in a larger measurement range. At this time, it is required that the rated voltage drop of all shunts used is consistent with the accompanying ammeter, such as 75mV. In this way, after the shunt is selected, the full-scale range of the ammeter is the rated current value of the selected shunt. The multiple of the ammeter (that is, the number of currents per grid on its dial scale) is the rated current of the shunt divided by the total number of grids on the dial scale.
Shunts used for DC current measurement are available in slot-type and non-slot-type types. The shunt has manganese-nickel-copper alloy resistance rods and copper strips, and is plated with nickel. Its nominal voltage drop is 60mV, but can also be used as 75, 100, 120, 150 and 300 mV.
Slotted current shunts are available in the following rated currents: 5 A, 10 A, 15 A, 20 A and 25 A. Non-slotted shunts are available in standard intervals from 30 A to 15 kA. All.
Application fields of splitters
Operators are concerned about network data protocol analysis, monitoring and control of VOIP traffic, P2P traffic, monitoring of illegal access of broadband users, intrusion detection system IDS, Burst traffic such as attack and virus monitoring and prevention, network traffic auditing and other fields.
The difference between a splitter and a router
One of the functions of a router is to connect different networks, and the other is to select the route for information transmission. Choosing a smooth and fast shortcut can greatly increase the communication speed, reduce the communication load of the network system, save network system resources, and improve the smoothness rate of the network system, thereby allowing the network system to exert greater benefits.
The router also has a function, which is that a network cable can only be used by one computer. The router can crack the network cable and use it separately for several people. This saves a lot of network fees! Only one person pays. The money you pay for surfing the Internet allows several people to surf the Internet together, but after they are separated, the Internet speed will slow down. Just like a stream, one family has enough water, but if several families use it together, the water will be less!< /p>
The shunt also has the function of shunting. However, it does not have the dial-up function and cracking function of the router. When the router's interfaces are not enough, you can add a few more interfaces by plugging in a splitter. Each interface can be connected to one more network cable, and one more network cable can be connected to more interfaces. Connecting a computer to the Internet is as simple as that. In our jargon, a splitter is called a switch.
AD589JRZ Detailed Specifications
Reference Type: Shunt
Number of Channels: 1
Mounting Type: Surface Mount
Category: PMIC - Voltage Reference
Voltage_Output: 1.235V
Current_Cathode: 5mA
Package__Case: 8-SOIC ( 0.154", 3.90mm wide)
Description: IC VREF SHUNT 1.235V 8-SOIC
Tolerance: ±5mV
Current_Static: -
Supplier device package: 8-SOIC N
Temperature coefficient: 100ppm/°C
Current_output: 5mA
Packaging: Pipe fittings
Manufacturer: Analog Devices Inc
Voltage_input: -
Operating temperature: 0°C ~ 70°C