Guide to Buy Single Mode Fiber Tester in NOYAFA

Guide to Buy Single Mode Fiber Tester in NOYAFA

2021-10-24
NOYAFA
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single mode fiber tester produced by SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED has passed multiple certifications. A professional design team is working to develop unique patterns for the product, so as to meet the high demands of the market. The product is constructed of durable and eco-friendly materials, which ensures a sustainable long-term use and causes little harm to the environment.These products have gradually expanded the market share thanks to the high evaluation of customers. Their extraordinary performance and affordable price promote the growth and development of NOYAFA, cultivating a group of loyal customers. With the huge market potential and satisfying reputation, they are perfectly ideal for enlarging business and generating revenue for customers. Most of the customers regard them as favorable choices.We guarantee to provide a warranty for single mode fiber tester at Best Cable Tester Supplier in China _ Noyafa. If there is any defect found, never hesitate to request an exchange or a refund. Customer service is always available.
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What Are the Functions of the Cable Identifier
What Are the Functions of the Cable Identifier
1. Left and right direction indication: the left and right arrows show the cable position, which is convenient and intuitive. 2. Tracking error prompt: the innovative patented technology of AC signal direction measurement is used to eliminate the ground wire return and induced current interference of adjacent and cross pipelines. When correctly tracking the cable to be tested, the pointer points to the front; When tracking to the adjacent cable, the pointer will be backward and a question mark will be displayed to prompt the tracking error. 3. High anti-interference: the unique digital processing method can completely suppress the power frequency and harmonic interference of adjacent operating cables. 4. Sound prompt: when it is very close to the top of the cable, there is a sound prompt. 5. Single key measurement of pipeline depth and current intensity: it can directly read the depth value and the current carried by the cable. 6. Multiple detection methods: in addition to the traditional sound peak method and sound Valley method, innovative and accurate methods are especially provided. The sensing range of the traditional sound peak method is too large, which is not conducive to accurate detection. Although the sound Valley method is accurate, it can not distinguish the parallel cable. The accurate method has a very narrow response range, is very accurate, and can distinguish the parallel cable. It is a better way to find the path in the complex area of the pipeline. 7. Two active detection frequencies: 1kHz, suitable for basic off-line detection; 15KHz is suitable for special situations. 8. Passive detection: it can directly detect the running cable without connecting the signal generator, and can also be used to detect other pipelines. 9. Historical curve display: the screen displays the historical curve of signal amplitude to visually judge the signal change. 10. Uniqueness identification: the detection caliper is used to identify the uniqueness of the cable. Through the combined signal sent by the detection generator, the amplitude and direction of the current on the cable can be accurately measured, and the identification results can be clearly given. 11. Built in battery for easy replacement: built in Ni MH battery provides reliable charging mode. Rechargeable batteries and dry batteries can be used interchangeably and can be replaced easily. Even if the battery fails, it can be easily replaced without repair, and it is conducive to emergency use without timely charging. 12. Low power consumption and long battery life: the instrument can work continuously for more than 30 hours by using a fully charged Ni MH battery or a new alkaline battery. 13. Automatic shutdown function: when the instrument does not operate within 30 minutes, it will automatically shut down to reduce battery consumption; When the battery is under voltage, the instrument will also shut down automatically to protect the battery. 14. The casing is durable, light and easy to carry.
What Are the Precautions for High Voltage Test
What Are the Precautions for High Voltage Test
1. The first type of work ticket shall be filled in for high voltage test. Fill in a work ticket when an electrical connection part has maintenance and test at the same time. However, before the test, the permission of the person in charge of maintenance shall be obtained. After the work ticket for high voltage test is issued in the same electrical connection part, it is prohibited to issue the second work ticket. If the disconnection point between the pressurizing part and the maintenance part has enough safety distance according to the test voltage, and there is a short circuit on the other side, the series resonance can be tested on one side of the disconnection point, and the other side can continue to work, but at this time, a "stop, high voltage danger!" sign shall be hung at the disconnection point, and a special person shall be assigned to monitor it;2. There shall be no less than two persons for high-voltage test, and the person in charge of the test shall be an experienced person. Before the test, the person in charge of the test shall arrange the safety precautions in the test in detail for all test personnel;3. If the equipment connector needs to be disconnected due to the test, it shall be marked before disassembly and checked after connection;4. The metal shell of the test device shall be reliably grounded, the high-voltage Lead shall be shortened as far as possible and firmly supported with insulating materials when necessary. The power switch of the test device shall make the double knife switch obviously disconnected. In order to prevent false closing and switching, an insulating cover can be added on the knife edge. There shall be two series power switches in the low-voltage circuit of the test device, and an overload automatic switching device shall be installed;5. A barrier or fence shall be installed on the test site, a "stop, high voltage danger!" sign shall be hung outward, and someone shall be assigned to guard it. When both ends of the tested equipment are not in the same place, someone shall be assigned to guard the other point;6. Before pressurization, it must be carefully checked that the test wiring meter, the magnification, the zero position of the voltage regulator and the starting state of the instrument are correct. Inform relevant personnel to leave the tested equipment and obtain the permission of the person in charge before pressurization. There shall be monitoring and singing during pressurization. The staff of high voltage test shall concentrate on all pressurization and shall not chat with others, Be alert to abnormal phenomena at any time. The operator shall stand on the insulating pad;7. When changing the wiring or after the test, first disconnect the test power supply, discharge and short-circuit the high-voltage part of the booster equipment to the ground;8. The tested equipment of the large fuse without ground wire shall be discharged first and then tested. During the high voltage DC test, the equipment shall be discharged to the ground several times and short circuited to ground at the end of each paragraph or end;9. At the end of the test, the tester shall remove the self installed grounding short circuit, inspect the tested equipment and clean the site;
This Paper Briefly Introduces the Fault Detection Method of High Voltage Cable
This Paper Briefly Introduces the Fault Detection Method of High Voltage Cable
The discovery and fixed-point work of cable faults has always been a big problem in the electrical measurement industry, mainly because most cables are deeply buried underground, the laying distance ranges from a few meters to a few kilometers, and the on-site environment is complex. In addition to the high quality requirements for cable fault test equipment, the comprehensive quality of technicians is also very strict. There are three common types of cable faults: low resistance fault, high resistance short circuit grounding fault and flashover fault. For different types of cable faults, the fault point detection methods are also very different. The following is a brief introduction to the fault detection method of high-voltage cable. There are two kinds of traditional fault detection methods for high voltage cables: bridge method and pulse method. 1、 Electric bridge method is a classical method for ranging power cables. This method is relatively simple, but it needs to know the data such as cable length in advance, and it is only suitable for low resistance and short circuit faults. However, in actual operation, faults are often high resistance and flashover faults. Due to the high fault resistance, the bridge current is very small, so it is difficult for general sensitivity instruments to detect. 2、 Pulse method 1. Pulse current method this method is safe, reliable and simple. The method is to break down the cable fault point with high voltage, collect and record the current traveling wave signal generated by the fault click through with the instrument, and calculate the fault distance according to the round trip time between the current traveling wave signal at the measuring end and the fault point. In this method, the pulse current is coupled with a transformer, and the waveform is simple and safe. This method also includes direct flash method and impulse flash method. Different from the pulse voltage method, which uses resistance and capacitor voltage dividers for voltage sampling, the pulse current method uses linear current couplers placed parallel to the low-voltage geodesic and has no direct electrical connection with the high-voltage circuit. It is particularly safe and convenient for recording instruments and operators. So people usually use this method. 2. Pulse voltage method this method can be used to measure high resistance and flashover faults. Firstly, the cable fault is broken down under the DC or pulse high voltage signal, and then the distance is measured by recording the time required for the discharge pulse to go back and forth between the measuring point and the fault point. An important advantage of pulse voltage method is that it does not have to burn through high resistance and flashover faults. It directly uses the instantaneous pulse signal generated by fault breakdown. The test speed is fast and the measurement process is simplified. 3. For low resistance and open circuit faults, the pulse echo method uses the low-voltage pulse reflection method to measure cable faults. Compared with the above bridge method, it is simple and direct. It only needs to observe the time difference between the reflection and transmission pulses at the fault point to locate the fault. During the test, a low-voltage pulse is injected into the cable. When the pulse propagates to the fault point, it will be reflected, and the pulse is reflected and sent back to the measuring point. The time difference between the transmitted and reflected pulses is recorded by the instrument, and the distance of the fault point can be calculated only by knowing the pulse propagation speed. This method is simple and intuitive. It does not need to know the original data such as cable length. It can also identify the position of cable joint and branch point according to the reflected waveform.
Why to Choose a Cable Continuity Testers for Your Home
Why to Choose a Cable Continuity Testers for Your Home
TCB360K1 Cable Prowler (tm) Pro Test Kit Full-color high-end cable length gauge with the ability to determine connection status and connectivity for POE detection. Klein Tools VDV501-823 VV Scout (r) Pro 2 Tester Kit Test Voice (RJ11-12) and Data (RJ45) via Video-to-F connector or coaxial connection. Before testing, make sure you remove the cable from your computer, modem or router.A cable tester checks the electrical connection between signal and cable and confirms that everything is wired correctly at both ends of the cable. With the HOSA CBT 500 you can test your cable gigging quickly and easily.Check that the cable connection you want to test is ready for analysis and that the tester is not electrocuted or that the device breaks. Test your network cables as with a network cable tester and run the test. If you connect both ends of the cable, a network cable tester will do the job for you and get an accurate reading of whether your cable is working or not.If you need to test voltage and current continuity, you should get an electric tester. With these testers you can test the cable against volts, current and ohms to check if the circuit is short-circuited through the cable. The testers can measure both AC and DC voltage and current in seconds.Continuity tests help to verify and reverse electrical circuit connections. For example, when two wires melt in a sheathed cable, a continuity detector lights up when you touch one probe with the black wire and the other with the white wire. Continuity testers are also excellent for checking if the wires are running smoothly and to see if the circuit is complete.Continuity checks can also be used to detect problems with cold soldering between wires or wire products. In addition, this type of electrical testing can also be used to check connection pads and traces on printed circuit boards (PCBs ).The most common and basic method to perform a continuity test with the help of a resistance tester is a simple multimeter function. Specialized continuity testers are available, but the most basic is an inexpensive light bulb that lights up when electricity is flowing. A digital multimeter continuity test can be used to test switches, switches, fuses, electrical connections, conductors and other components.A continuity tester consists of a battery, a housing, a probe connected to one end of the housing and a test wire connected to the other end with an Alligator clip. A continuity test on an electrical circuit is performed when it is not switched on by using a tester. To use a continuity tester, first pull the device off the connector and disassemble it to get to the component you want to test.Continuity testers are easy to understand: they consist of a battery housed in a housing, a cover, a probe for testing the wire, a tensed end of the battery in the housing and an alligator clip for the second end.A continuous tester is an electrical tester used to determine whether an electrical path has been created between two points [1] where an electrical circuit is produced. Its user-friendliness is determined by the fact that it is a power switch to determine whether an electrical device maintains a flowing current flow in its body. If this is not the case, it is used to find out the root of the problem within the device.Testers are excellent for checking whether a device is working properly, such as a single-pole switch, or for checking lamp wiring to see that electrical paths are intact. Make sure you turn off the power for the circuit or the device you are testing. These test tools allow network technicians to isolate cabling problems and network protocols to solve problems.This works with any coaxial cable with a special tester, whether you are using a VDV512 or 007. Like James Bond, the tester will spy on the cable and help you identify and label the right cable.A continuity tester is a special electrical device used to check the continuity of cables and wires in a circuit. A network tester calculates the signal and power transmitted from one end of a connection to the other in a twisted pair. If the cable is continuous, this means that all voltages applied to the cable are in the same place.If you want to check the quality of your cables, use a standard tester. Professional network testers are used in commercial environments and are used by certified professional cable installers to get the job done.Test tools do not provide bandwidth readiness information for high-speed data communication. Certification audits are a way for installers to ensure that the cable fed into the network meets TIA and ISO requirements. These tests are performed by professional network testers and certified installers.To help you find the best network and cable tester for your use, I have compiled a list of test products that work well. The LinkIQ cable network tester is easy to use as explains Eric Webb, Flukes Network Product Manager, in the video below. It shows the settings to use and how to use them to perform cable tests, save the results and upload them to linkware where they are available.I came across the Elegiant Network Cable Tester while working on establishing a LAN connection for a local company. With my extensive experience as an electrician, I can say that this is the best tool for testing cable connections.Selecting, selecting and purchasing a suitable network cable tester can be a complicated and challenging task. In this article, a great effort has been made to show you how to test the continuity of circuits and how a good continuity tester will handle your situation. This article examines which tools are best suited for normal cables, which are best suited for coaxial cables, which are to be used and which cable types are to be considered when measuring the limit values.
5 Tips on How to Use and Maintain Electric Screwdriver
5 Tips on How to Use and Maintain Electric Screwdriver
An Electric screwdriver is what we generally call power screwdriver. It is widely used in automobile assembly, household appliances, consumer electronics, LED and so on. Power screwdriver works on the basis of ordinary screwdriver driven by power. It can improve working efficiency. Today, I would like to share with you seven tips on using and maintaining electric screwdrivers.Five tips on Maintenance Power ScrewdriverRead the instructions and operate the power screwdriver according to the specificationsThe use of the process should pay attention to the motor size of power screwdriver. Dont operate blindly in case of excess of workload and damage to the power screwdriver. For example, like this screwdriver with torque control its torque range is 3070 kf.cm. It can only tighten objects within 3070 kg but not 80 kg. Because its torque value does not meet the requirements, which will damage the power screwdriver and reduce its life. [caption4. During the using can not be directly adjusted from the lowest torque to the highest torque or from the highest torque to the lowest torque, this is easy to cause clutch and torque thimble off. Thus reducing the service life of electric screwdrivers. Before using the power screwdriver you should tighten the fixing ring (or torque sheath) of. Both ends of the power cable should be symmetrical with the socket hole of the power supply and the electric driver and tighten the nut of the power cable.6, power screwdriver should be kept well, do not allow the corrosive liquid to enter5. Please keep the repair card of the power screwdriverBrushless vs. power screwdriverThe carbon brush life of the electric screwdriver is about 1000 hours. Of course using the original carbon brush, in addition to the power screwdriver to maintain. I suggest buying a brushless electric screwdriver, which is maintenance-free. Brushless power screwdriver will not produce an electric spark, strong anti-interference abilityAlthough the power screwdriver and common screwdrivers are the same, the operation method is simple, but the use of skill is not in place, can cause certain damage to the power screwdriver, so should ensure correct use method and maintenance skill, increase its service life. Brushless power screwdriver will not produce an electric spark, strong anti-interference ability. Brushless motor without carbon brush can reduce noise and wear.
Three Preventive Measures for Cable Leakage in Cable Fault Detection
Three Preventive Measures for Cable Leakage in Cable Fault Detection
It is very troublesome to solve the problem of the cable leakage, and the general cable fault tester is not equipped with the corresponding treatment equipment. In the specific operation, if a part of the cable joint end leaks, it can be applied again only by cutting off how many meters of the front-end development. If the reading of a cable has leaked, the foundation can not be used at this stage, so it can only be charged. Therefore, avoiding cable leakage is the appropriate choice, so as to take preventive measures. First, the cable joint shall be sealed. The sawn cable edges, whether stacked or laid, shall be sealed with plastic, and the special sealing sleeve for cable shall be selected to avoid the penetration of moisture and moisture. The fabrication of cable joints shall be carried out immediately after cable laying. Second, when purchasing cables, be sure to select manufacturers with solid quality. Because the residue and air outlet hole in the insulating layer are the starting point of water tree generation, the quality of cable is particularly important to avoid water tree embrittlement. Third, improve the management method of cable head production and processing technology. Once the cable leaks, the cable joint is usually the first to penetrate. Therefore, if the cable head is made well, it can increase the overall service life of the cable. For example, when the cable is separated from the semiconductor material layer, draw several vertically on the semiconductor material layer, and then peel off the semiconductor material like Gan Shu peeling. However, when cutting with a knife, if it is too deep, it will hurt the cable sheath and create opportunities for water supply and drainage trees. In addition, when the solder wire is used, because the switching power supply cannot be found, the gas furnace will be used to melt the solder wire immediately. At this time, the flame will destroy the copper shielding layer and cable sheath. Therefore, to avoid this kind of situation, UPS can be equipped. Since the time required for the solder wire is generally only 10min, the output power is 500W. PVC plastic PE corrugated pipe is selected, which has corrosion resistance, clean and bright inner cavity The compressive strength and ductility are excellent. Therefore, when the cable is buried and laid, the damage of the cable outer sheath can be greatly reduced. Design scheme of cable trench (pipe) and cable well. Due to the limitation of the standard, the cable laying adopts the method of buried or cable trench, and most of them are buried. If it belongs to the rainy area in the coastal area, there is water stored in the cable trench or cable well for a long time. Because the depth of the cable trench or cable well will exceed the depth of the sewer pipe, the drainage pipe is very difficult. Therefore, in the overall planning, harmony should be carried out, which is conducive to the drainage pipe of the cable trench (well). If it is impossible to ensure that there is no water in the cable well, the middle connector in the cable well shall be lifted with a support frame.
How to Ensure the Correctness of Cable Identification by Live Cable Identification Instrument
How to Ensure the Correctness of Cable Identification by Live Cable Identification Instrument
In the 21st century, with the rapid development of railway, the speed per hour is faster and faster, and the marshalling operation is more and more intensive, it is necessary to ensure the normal operation of electrical service system. How to ensure the correctness of cable identification by live cable identification instrument, we will discuss and explain this problem below. In the electrical service support, the fault and construction of signal cable shall be tested and identified quickly. If the identification is wrong, it will have a very serious impact and cause train accidents. So let's talk about the identification of electrical service system. 1、 Current situation and disadvantages of signal cable identification in telecommunication system target cable identification is required in field work such as emergency repair, relocation and replacement of signal cable. Since there is no suitable instrument, most of our signal cable maintainers use the following methods to identify. First, wait for the skylight point, and remove the signal cable sheath when the skylight point; Secondly, two core wires are selected as the identification wire, and the two core wires are also found at the end; Finally, use the blade to cut the skin of the selected two core wires for short connection, and use the external meter to measure whether the selected two core wires are short circuited at the end. If they are short circuited, it means that the identification is accurate, otherwise, the identification is wrong. However, there are many disadvantages in using this method for identification: 1. Generally, such work is rush repair, which must be completed in the skylight point. If it takes up the time in the skylight point for identification, the rush repair time will be greatly reduced, and some even need to apply for two skylight points to complete a work; 2. After the selected two core wires are short circuited, the two core wires found at the end may not correspond, resulting in wrong results; 3. The outer skin and copper shield of the cable shall be broken. After identification, this place shall be restored. In the future, this place is a joint and a potential fault point. 4. The most important thing is that this identification often produces wrong results, resulting in operation accidents. 2、 Current status of cable recognizer 1. Current status of identification equipment (identification and attached identification): status of identification 1: conventional cable recognizer is designed for power cable identification and is widely used in the power field. Whether imported or domestic, it has two service conditions: 1) it has high requirements for the loop resistance of the target cable, Generally, it shall not exceed 50 ohms. If it exceeds the range of this circuit resistance, the equipment will not work normally, which is beyond the range of equipment use; 2) Disconnect at least one end of the outer armor grounding (same as shielding grounding) at both ends of the target cable, so that the applied signal cannot return from the target cable. Therefore, this power cable identification instrument is not suitable for the identification of electrical signal cables. Identification status II. When promoting digital path tester, some manufacturers publicize that the equipment has identification function. In fact, when using the digital path tester to identify, if the receiver touches the identified cable, which signal is the strongest, that is the identified cable. This recognition method has a single judgment basis in recognition, only the signal size, no signal direction, and can not be used as the final judgment. Moreover, such equipment has great attenuation on the signal cable, and the identification of long-distance signal cable can not be done at all. 2. Conclusion: the use conditions of power cable identification instrument and digital path tester determine that these two types of equipment are not applicable to the signal cable of electrical service system. 1) For the signal cable of electric service. The cable is very long, with a length of more than 5km, and some can reach more than 20km; The wire core is very thin, generally 1mm ² , The resistance is 23.5 Ω per kilometer, and the cable body resistance of more than two kilometers has reached the critical value of equipment test, so the loop resistance problem has become a hard wound of the conventional identification instrument. 2) In the electrical service system, it is very inconvenient to open the outer armor grounding (the same as shielding grounding) of the signal cable. The regulations of each Railway Bureau and railway line are inconsistent. Some cannot be opened, some must be opened in the skylight point, and must be restored before the end of the skylight point. Based on the above two points, the conventional cable identifier and Pathfinder can not meet the requirements of signal cable identification of railway electrical service system. 3、 During the test of railway signaling cable identifier, the requirements for loop resistance can reach 1000 Ω, and there is no requirement for armored grounding or ungrounded of the target cable. The utility model solves the difficult problem of identifying the signaling cable. The railway communication cable is specially designed and can be used online. It has the characteristics of micro power transmitting signal, has no crosstalk and interference to the data transmission of adjacent cables, and accurately finds out the required cable. The size double jaw configuration can not only identify the cable, but also identify the wire pair in the cable. Color large screen LCD, live voice prompt, friendly intelligent man-machine interface, and its unique intelligent orientation can indicate the signal direction, which makes the operation simple and practical. It is especially suitable for field use. Even untrained personnel can use it quickly. Through live measurement, it is not necessary to apply for night skylight time to cut off and repair cables. Workers in the front-line electrical service workshop can measure during the day, including when high-speed rail / Bullet train passes, which improves the timeliness and operability of detection.
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.
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