What Is Pen Multimeter?

What Is Pen Multimeter?

2021-10-25
NOYAFA
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pen multimeter from SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED has withstood the fierce competition in the industry for many years thanks to its high quality and strong functionality. Besides giving the product an aesthetically pleasing look, our dedicated and foresighted design team has also been working hard to constantly improve the product to be higher-quality and more functional through adopting the well-selected materials, the advanced technology, and the sophisticated equipment.All NOYAFA products are highly praised by customers. Thanks to the efforts of our industrious staff and large investment into the state-of-the-art technology, the products stand out in the market. Many customers ask for samples to get to know more details about them, and even more of them are attracted to our company to try these products. Our products bring bigger orders and better sales for us, which also prove that a product that is exquisitely made by professional staff is a profit maker.We will strive to provide customers with something worthful through every service and product including pen multimeter, and help customers perceive Best Cable Tester Supplier in China _ Noyafa as progressive, refined and engaging platform providing values.
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How to Choose Fiber Optical Tester
How to Choose Fiber Optical Tester
Transmitter and receiver jack are fiber optic connectors that measure the power of the transmitter by connecting the test cable to the source and measuring power at the other end. The receiver is the one who disconnects the cable attached to the receiver jacks and measures the output with one meter.Other methods of testing fibre optic connections include starting the cable from the receiving cable and connecting it to an electricity meter. The standard loss test is an installed cable system that includes loss measurement to test the cable connection at each end. If you can, you can measure the loss from a connector connected to a reference cable, a loss fiber connection, or any other connector on the cable you want to test.This allows you to measure the two lost connectors at one end and the loss from cable to cable. The source counter duplicates the transmitter and receiver of the fiber-optic transmission connection, so that the measurements correlate with the actual system loss. The optical return loss (ORL) is expressed in decibels (dB) and affects how the light source or fiber reduces the data transmission speed.The optical time domain reflectionometer (OTDR) is used as a fiber optic cable tester to test optical losses. Using a high intensity laser light that emits a predefined pulse interval and is connected to the cable at one end, the cable is guided through an OTDR to analyze the backscattering of the light returning to the source location. A simple instrument that injects visible light is called a fiber tracer or visual fault locating mechanism.Calibrated optical light sources (OLs) can be used with an optical power meter (OPM) in conjunction with an OPM to quantify the insertion loss of the members during powering on. An important test of loss of input in an installed fiber optic cable system is performed with a light source power meter (LSPM), while an optical loss test kit (OLT) is required as an international standard to ensure that the system has a loss budget for acceptance and installation. The OLT, which uses both optical light sources and power meters, is considered the best fiber test practice to ensure the optical power budget and design specifications.Two devices are required to test the end-to-end performance of a fiber optic system: an OPM test and a light source. The testing of optical fibres requires special tools and instruments to select the appropriate components for the cable system to be tested. The source of the power meter, the optical loss test kit (OLT) and the appropriate device adapter are the cables and equipment you will test.Outside the fiber system, cables with an OTDR are tested for end-to-end losses to ensure that the installation is carried out correctly. The OTDR can also be used for troubleshooting, e.g. Interruptions in places due to excavations. Installers are often asked to use a loss test set up with a source current meter and OtDR to perform bidirectional tests, provide accurate cable documentation and certify their work.This video gives you a clear test procedure for fiber power meters and shows you how to test fiber adoption losses with two fiber optic test devices. Testing light sources of power meters is also known as the One-Jumper method as the most accurate way to measure the end-to-end signal loss in the fiber known as attenuation. If the light source operates at a wavelength of 1310 nm, for example, the optical power meter is set to 1310 for testing.The OLT Optical Loss Test Kit is a mainstay in the testing of fiber optic cables as it provides a precise method for the total loss of a connection as required by industry standards to ensure that the connection meets the loss requirements of a particular application. When fiber optic cables are in the facility, you need to test for continuity and end-to-end losses to resolve problems. Regardless of whether it is a long installation cable or an intermediate cable, you want to verify every single connection with an OTDR, because this is the only way to ensure that each one is good.Knowing how to select, install and maintain fiber optic cables is important to optimize system results. Combines fiber spectroscopic analysis systems to achieve optimal performance and results. Inline and flexible fiber-optic process analyzers and systems enable the user to place measuring probes at several points on one instrument, thereby reducing costs.Patented fiber constructions with emphasis on high-quality materials and spectroscopically guided waves are designed for high transmission efficiency and durability. The significant increase in the number of applications supporting data centres has resulted in more cable connections being established than ever before, and available space is a priority. Fusion splicing is used for FTTH applications to install connectors. Drop cable customers can use the new splice connector technology for fall cable fusion splicers.For example, expensive 10G certified Cat6A cables can be used instead of duplex fiber-optic cables, which require expensive transceivers. As a result, high-density solutions such as MTP / MPO connectors and multi-fiber cables, which require less wire space than single duplex cables, are becoming increasingly popular. While some manufacturers offer locally installed MTP and MPO connectors, many data center managers opt for Multi-Fiber Trunk Cable (MTP) or MPO (Factory Terminated End Fusion Splicing) or pre-terminated MTP (MPO) or Multi- Fiber LC Pigtails.They combine a fiber optic cable with a transceiver and eliminate the connectors. Fiber optic cables, also known as fiber optic cables, transmit data in light pulses through flexible pure fibers, glass or plastics. Thanks to their high data transmission speeds over long distances, they have become a popular choice for Ethernet networks and telecommunications applications.With thousands of connections, excessive slack leads to a lot of congestion, which restricts the proper airflow and cooling. An alternative is the purchase of multi-fiber pigtails that can be spliced into a multi-fiber cable. Sharp bends of 1.5 cm radius should be avoided, as they strain the fiber and cause optical losses.
Cable Fault Test Procedure
Cable Fault Test Procedure
When using cable fault tester (echo method) to test cable fault, the following procedures shall be followed: â‘´ multimeter, megger or judge the nature of cable fault from the cable pre-test results. (2) select the appropriate test method according to the nature of cable fault: the pulse method is best used for low resistance fault and open circuit fault. Of course, the flashover method can also be used for low resistance fault. Flashover method (impulse l method) is best used for leakage high resistance fault, and direct flashover method can also be used for some leakage high resistance faults, but this is usually not done. Direct flashover method is best used for flashover high resistance fault, or both methods can be used to measure and compare each other to improve the accuracy of judgment. (3) select the working grounding point, and lead out two grounding wires respectively from the selected grounding point, one to the ground of the instrument and the other to the ground of the high-voltage equipment. The selection principle of working ground wire is to ensure that the test phase and it form a closed loop, so that the instrument can obtain the correct test waveform. It should also be noted that the working ground wire must be connected with the system to make the human, instrument ground, high-voltage equipment ground and the tested cable ground in the same position. To ensure personal safety and integrity of instruments and equipment. If the cable is in phase to phase fault, the working ground wire must be one of the phase wires, and the phase wire as the ground wire must be connected with the system ground. For the cable with lead-free bushing, most of the faults are discharged to the earth or space during the high-voltage flashover test. Theoretically, the fault also forms a closed loop relatively to ground or space, but in fact, the equivalent impedance in the loop is quite large, so the correct test waveform can not be obtained on the instrument. In case of this situation during the test, the method of directly fixing the suspicious fault point can be adopted to solve it. No matter what ground wire, its grounding point must be reliable. (4) test the total length of the cable with the pulse method to calibrate the radio wave transmission speed of the tested cable. (5) rough test the fault point according to the selected test method. (6) fix the fault point after rough measurement.
Introduction to the Use of Cable Fault Finder
Introduction to the Use of Cable Fault Finder
Due to the cable fault caused by cable laying, the location of cable fault varies with the cable laying mode, and the location increases gradually. Among them, the laying side in bridges, tunnels and trenches is relatively simple, and the direct burial method is difficult to locate. When the nature of the fault is simple, a special cable fault finder is used, and it takes 4-5 days or even longer to locate the equipment within dozens of minutes. When using echo method to locate cable fault, sometimes by transferring fault phase and wiring mode, complex fault will often be transformed into simple fault to quickly determine fault location. It is of great significance for the power supply user department to win time for the emergency repair of on-site lines. Low voltage power cables are generally multi-core cables. When faults occur in continuous use after laying, they generally show two core and multi-core phase to phase or phase to ground short circuit faults. Sometimes when it is detected that the fault waveform collected by one core is not ideal, it can be considered to convert the wiring to other fault cores for fault waveform detection, which often has unexpected effects, The collected and detected waveforms will become more typical and regular, so the specific location of cable fault point can be determined quickly. During the long-term on-site measurement of cable customers, it is found that the fault of small section copper core directly buried power cable (35mm2 and below) and aluminum core cable may be accompanied by short circuit and wire breakage at the same time. During on-site detection, converting short-circuit fault into broken line fault measurement according to the different fault nature of each fault core will often double everything with half the effort. For the medium voltage direct buried power cable with extruded armor as the inner lining, the fault is mostly caused by external mechanical damage. When the insulation core fails, the inner lining may have been damaged. When the cable insulation fault is special and it is difficult to collect the waveform with a professional cable fault tester, the acoustic method can be considered, When the high voltage pulse is directly applied between the steel strip and copper shielding layer of the cable, it will often be fixed quickly. Using the cable fault finder in the field measurement process, we also found that when using the acoustic method to locate the fault of low-voltage cable. When the high-voltage line and ground wire are connected between the bad phase and the metal shield or armor, due to the low resistance metal connection state of the insulation resistance of the two, the sound is very small, so the probe can not be used to listen to the fixed point, and the effect is not ideal. Through the actual listening side on the site for many times, it is found that the distance between the discharge ball gaps is appropriately increased. At the same time, if the high voltage and grounding wire are connected between the two faulty phases, the discharge sound will become louder and the fault point will be determined quickly.
How to Diagnose and Solve Cable Leakage with Cable Fault Tester
How to Diagnose and Solve Cable Leakage with Cable Fault Tester
How can the cable fault tester diagnose and solve the cable leakage? As the main cable fault, when the power cable leaks to the earth, it will produce a strong to weak directed electric field gradient around the fault point on the ground. The amplitude and direction of the signal can be measured by Bao Shun Tong cable fault measuring equipment along the cable path. Before and after the fault point, the direction pointed by the galvanometer pointer is opposite, so as to find the fault point of the cable and achieve the purpose of accurate positioning. 1. Cable fault diagnosis depends on the nature of the fault. Cable fault can be divided into low resistance grounding or short circuit fault, high resistance grounding or short circuit fault, wire break fault, wire break and grounding fault and flashover fault. Cable fault diagnosis can determine the type and severity of cable fault, and it is also convenient for testers to test it with different test methods according to different fault types. For example, for high resistance faults, the impulse flash method can be used to locate the fault location. 2. Cable fault location. Cable fault location is also called rough measurement. There are two rough measurement and location methods: electric bridge method and wave reflection method. At present, wave reflection locator is more popular. However, several cable faults are difficult to find by wave reflection method, such as insulation defect points of high-voltage cable sheath, steel tape armored low-pressure cable, PVC cable and short cable can not be located. In addition, some high breakdown points cannot be broken down under impulse voltage and are difficult to locate. 3. Cable fault point. It is also called precise measurement. The cable fault can be accurately fixed through the methods of acoustics, electromagnetism, electronic signal processing and electronic cancellation theory. The LCD can display the sound pulse, magnetic pulse and the distance between the fault point and the probe test point at the same time. At present, the cable fault can be accurately fixed by the following four methods: (1) Acoustic measurement method: the high-voltage pulse generator discharges the fault cable, the fault point generates an arc and generates a discharge sound. When the cable is directly buried, it generates a seismic wave. The acoustic probe of the pointing instrument picks up the seismic wave signal and amplifies it and outputs it through the headset or meter head. (2) Step voltage method: it is mainly aimed at the fixed point of outer sheath grounding fault with requirements for cable outer sheath insulation. Now, step voltage method can also be used for the fixed point of some directly buried unarmored low-voltage cables and wire core grounding fault. (3) Electromagnetic method and audio method: fix the point with electromagnetic wave or audio method, that is, determine the fault point by using the change of electromagnetic wave signal or audio signal at the front and rear points of cable fault. (4) Acoustic magnetic synchronization method of cable fault tester: it is the comprehensive application of acoustic measurement method and electromagnetic wave method. Then, according to the above operation methods, we believe that the fault point can be found soon, and we can quickly repair and restore the normal operation of power.
How to Select Cable Fault Test Equipment
How to Select Cable Fault Test Equipment
Recently, many friends have consulted about the selection of cable fault detection equipment. Whether the matching of cable fault detection equipment is correct will directly affect the use effect of the equipment. It is only necessary to select the corresponding supporting equipment according to the cable condition of the unit to ensure the reliability and convenience of the test work. Now let the cable recognizer manufacturer introduce how to select the type. Generally, cable testing equipment can be selected according to the following principles: first, selecting perfect service is the primary factor; In recent years, due to the increasing popularity of cable test equipment faults among domestic users, domestic manufacturers and dealers are also increasing. Choosing reliable manufacturers and whether they can provide high-quality services should be the only correct choice for users to choose cable test equipment at present. 2、 Products with advanced performance are the best choice; Since it came out in the 1970s, the cable fault tester has undergone years of continuous improvement, especially the application of computer technology and high-speed sampling technology in the 1990s, which has revolutionized the performance of the instrument. By transforming analog test technology into digital test, the test waveform can be permanently saved or printed. Wave storage problem: due to the rapid development of microcomputer technology in recent years. Due to the adoption of new electronic components and new technologies, cable fault detection technology has developed greatly. The previous single waveform detection has been gradually replaced by a series of waveform processing technologies such as multi waveform display, waveform superposition and waveform comparison. Modern new cable fault tester generally has waveform storage function. Due to different models, the number of stored waveforms is also different. Generally, there should be at least two groups of waveform storage in use for comparison when analyzing waveforms. The advanced test instruments currently designed have on-site protection function. No matter when you start, you can reproduce the last test waveform. In this way, it plays an important role in summarizing and summarizing data in the office after the on-site test. In the design of old-fashioned instruments, the memory will be cleared after startup for test preparation. The test waveform will be lost and no data will be retained in the instrument. Automatic identification of waveform: the cable fault tester mainly collects and displays the waveform of cable fault discharge in the test process, and generally needs to analyze and judge the collected waveform manually. Therefore, the analysis level of the operator is required to be high, and the inexperienced operator is often unable to correctly judge the fault waveform, resulting in the query cable fault can not be handled correctly. And the existing new cable instrument has the function of automatic identification.
How to Use Network Cable Tester_ Application Method of Network Cable Tester
How to Use Network Cable Tester_ Application Method of Network Cable Tester
Now cables are used in all aspects of people's production and life, so mastering the operation method of network cable tester is the most basic requirement for cable users. So how to use network cable tester?Application method of computer network cable tester1. Insert the two ends of the network cable above the main and auxiliary survey lines respectively, and you can insert any head at will;2. Then turn on the switch of the line measuring instrument;3. Observe whether the indicator lights of 1-8 on the main and auxiliary line measuring instruments are on, and the order of lights is correct.4. For example, 1 light on the main survey line instrument should be on, and 1 light on the auxiliary survey line instrument should also be on. If the 1 light on the main line measuring instrument is on and the 2 light on the auxiliary line measuring instrument is on, it indicates that there is a problem with the network cable and it can not be used normally;5. Among the eight lights, as long as the lights 1, 2, 3 and 6 are on, the network cable can be used, because the data is transmitted through these four lines, and the other four lines are not used to transmit data.There are two standards for the order of network cables:1: The standard of t568-b is orange white, orange, green white, blue, blue white, green, brown white and brown.2: The standard of t568-a is green white, green, orange white, blue, blue white, orange, brown white and brown.The first standard is generally used.Second, insert the crystal heads at both ends of the network cable into the RJ45 port of the main tester and the remote test end respectively, and turn the switch to "on" (s is slow gear). At this time, the indicator heads of the main tester and the remote test end should flash one by one.Test of direct connection: when testing the direct connection, the indicator lights of the main tester should flash one by one from 1 to 8, and the indicator lights of the remote test end should also flash one by one from 1 to 8. If this is the case, it means that the connectivity of the through line is OK, otherwise it has to be redone.Test of interleaved lines: when testing interleaved lines, the indicator lights of the main tester should also flash one by one from 1 to 8, while the indicator lights at the remote test end should flash one by one in the order of 3, 6, 1, 4, 5, 2, 7 and 8. If so, the connectivity of interleaved lines is OK, otherwise it will have to be redone.If the line sequence at both ends of the network cable is incorrect, the indicator lights of the main tester still flash one by one from 1 to 8, but the indicator lights of the remote test end will flash one by one according to the order of the line numbers connected with the main test end. In other words, the remote test end cannot flash in the order of the above steps.Phenomenon of wire open circuit testWhen one to six wires are open circuit, the indicator lights of the corresponding wire number of the main tester and the remote test end are not on, and other lights can still flash one by one.When 7 or 8 wires are open circuit, the indicator lights at the main tester and remote test end are not on.Phenomenon of wire short circuit testWhen two wires are short circuited, the indicator lights of the main tester will still flash one by one in the order from 1 to 8, while the indicator lights corresponding to the two short circuits at the remote test end will be lit at the same time, and other indicator lights will still flash one by one in the normal order.When three or more wires are short circuited, the indicator lights of the main tester still flash one by one from 1 to 8, while the indicator lights corresponding to all short circuits at the remote test end are not on.
Pulse Flashover Method for Fault Detection of High Voltage Cables
Pulse Flashover Method for Fault Detection of High Voltage Cables
Cable has a very important application scenario in our daily life. It can be said that we can't live without cable. In order to ensure the normal use of the cable, it is necessary to regularly detect and maintain the cable. In case of cable failure, the fault point shall be found out in time for maintenance. There are many cable fault maintenance methods. Today, I mainly introduce one of the high-voltage cable fault detection methods, pulse flashover method. For high resistance fault, due to the large resistance at the fault point, the reflection coefficient at this point is very small or almost equal to zero. When measured by low-voltage pulse method, the reflected pulse amplitude at the fault point is very small or there is no reflection, so the instrument can not distinguish it. There are two common high voltage flashover measurement methods, namely DC high voltage flashover measurement method (direct flashover method for short) and impulse high voltage flashover method (impulse flashover method for short). 1、 DC high voltage flashover method (referred to as direct flashover method) when the fault resistance is very high and a stable resistance channel has not been formed, the gradually increased DC voltage can be applied to the tested cable. After reaching a certain voltage value, the fault point is preferably broken down to form flashover. The flashover arc is used to form a short-circuit reflection on the added voltage, and the reflected echo is formed by a high resistance source at the input end to form an open circuit reflection. In this way, the voltage will be reflected many times between the input and the fault point until the energy is exhausted. 2、 Impulse high voltage flashover method (impulse flashover method for short) when the fault resistance is reduced and a stable resistance channel is formed, the DC high voltage cannot be added due to the limitation of equipment capacity. At this time, it is necessary to use impulse voltage test. The DC high voltage charges the cable through the ball gap until breakdown, and still generates short-circuit reflection with the flashover arc formed by it. The measuring inductance L shall be added at the cable input end to read the echo. The radio wave is reflected by short circuit at the fault point and l at the input end, and multiple reflections will be formed during this period. Due to the self induction phenomenon of inductance L, it begins to show open circuit reflection due to the current blocking effect of L, and shows short-circuit reflection after a certain time with the increase of current. The whole circuit consists of capacitor C and inductance L, which constitutes a large process of L-C discharge. Therefore, the wave process at the line input is a nearly attenuated cosine curve superimposed with fast pulse multiple reflection wave. 3、 High voltage cable fault detector is generally used. High voltage cable fault is high resistance fault, and high voltage flashover method is used to measure the distance of fault point. This method uses st-330b cable fault locator as experimental equipment. 1. Wiring mode: firstly, complete the wiring of high-voltage flashover as required; Then, connect the sampler with the ranging host with a double clamp test line, and then place the sampler next to the grounding wire of the high-voltage capacitor. 2. Equipment operation (1) start up, select the sampling method as flashover, the pulse width is the default, the cable type is the physical type, and the reading accuracy is the default. (2) Use the high-voltage equipment to discharge the cable, and then click the orange sampling button on the right to start sampling until the waveform is collected. Press the sampling key again to stop sampling. (3) Study the waveform, move the vernier ruler to the starting point and ending point of a waveform, read the waveform, and the distance of the fault point will be automatically measured in the upper left corner.
Cable Tester, Cable Tester Software
Cable Tester, Cable Tester Software
The introduction of cable testerTo reduce the costs of content development, some companies require their writers to do the same thing they do for clients. They test the quality of the content produced by both internal and external writers.Tips for cable testerThe cable tester is responsible for testing all the cables of a home or network. These testers are usually used to test whether a cable is working correctly or not. In most cases, the cable tester uses basic tools like voltmeter and ohmmeter to check the electrical connection but sometimes they also need other tools like earphones and headphones.How to use cable tester?Cable splitter is a device used to split an HDMI cable into two cables. It can be used to split HDMI cables into three different cables, four cables, five and so on.The specifications of cable testerAn expert in his field is a better source of information than a layman. A good cable tester knows what he is talking about and can therefore point out issues with cables.The product instructions of cable testerIn order to test the product, a tester needs to watch a video. The person who tests the product needs to know what the visuals look like. They need to know what is visible and what is not in order to understand if this is a good or a bad product for them.The application of cable testerA cable tester is an application that uses some artificial intelligence techniques to test the quality of the cables. These artificial intelligence techniques are designed to ensure that cables don't break or give out during a long run, and catch any faulty cables.The application of cable tester in a production environment is not easy, as it involves a lot of manual work as well as advanced testing procedures. It also requires communication between multiple people to make sure that all the tests are done correctly. There are also a lot of problems with this scenario which makes it more problematic for companies to consider it for their production environments.
Do You Know How to Choose a Suitable Cable Fault Tester
Do You Know How to Choose a Suitable Cable Fault Tester
Cable fault tester is one of the common equipment to detect cable fault. It has stable performance, can quickly and accurately find out the fault point, and the maintenance personnel can quickly carry out maintenance work, which greatly provides work efficiency. The purchase of cable fault tester is also a problem valued by many friends. Next, we will focus on the precautions for purchase. Another situation of the power supply analysis of the damage of the cable fault tester in recent years, 80% of which is due to the poor wiring or wrong wiring during high-voltage impulse flash, resulting in the damage of the instrument. If the battery is used for power supply, even if the high-voltage is connected in series, it will not form a loop to the earth and can only cause the common mode effect, so as to completely avoid the occurrence of machine damage accidents. Problems of collector and notebook computer: the test scheme of collector notebook is a design scheme proposed by the company in 1996 and put into practice. In 1997, the cable fault test and management system was launched. Through several years of market use, it seems that it does not adapt to China's national conditions. At that time, the principle considered in the design was to give users a good tool and strong data processing ability. But for the following reasons. At present, it has been discontinued. Reasons why notebook collector is not suitable for on-site cable fault test: 1. The on-site environment is not suitable for the use of notebook computers. Generally speaking, notebook computers are relatively delicate and suitable for office or business travel. However, most of the cable fault tests are in substations or outdoors, with large dust, large interference and complex environment, which will greatly shorten the service life of notebook computers. And the sampling waveform is not good. 2. Generally, the switching power supply of notebook computer can only be used when the impact of power grid is small. When the high-voltage impulse flash of cable fault is carried out, the power grid fluctuates greatly, which is very easy to cause damage to the power supply of notebook computer. Therefore, when testing the high-voltage impulse flash of notebook computer, it is emphasized to disconnect the charging power supply and test with the internal battery. 3. In the cable fault test, the high voltage string into the tester is a common problem due to the wiring problem. The impact resistance of the notebook computer is very weak. High voltage enters the notebook computer through the test line collector, which will eventually lead to the damage of the notebook computer interface. Such lessons have been encountered in several cases in our customers. Although current sampling can improve the safety of equipment at present, current sampling is chaotic for short-range fault waveform and difficult to identify, so it is often misjudged when testing short-range fault. 4. Computer viruses will affect the normal use of the equipment. Such problems seem to have nothing to do with our equipment, but users will inevitably make the computer impacted by various computer viruses when using the computer. When there is a problem with the cable, there will be various problems when taking it out for use, and it will not work normally. This results in delayed power supply. At present, the cable fault tester with advanced performance should be equipped with an interface for communication with the computer. Select the cable fault tester with computer interface and test with the cable fault tester on site. After the test, the test waveform needs to be saved and uploaded to the laptop or other computers for archiving, analysis, production of test reports, etc. It should be the best procurement scheme.
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