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Shop Best Hd Cctv Tester in NOYAFA

2021-10-22
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What Are the Methods of Cable Fault Detection
What Are the Methods of Cable Fault Detection
The fault types of power cable mainly include parallel fault and series fault. Series fault refers to the disconnection of multiple or one conductor in the cable. Usually, it is difficult to detect the series fault before disconnecting a conductor in series. It is easy to find the series fault only when there is a real short circuit. Parallel fault is caused by external insulation aging caused by cable overload operation for a long time, and then partial discharge, resulting in parallel fault. The cable fault different from the length difference and resistance value is broken down, and the cable fault can be divided into high resistance type, low resistance type and open circuit fault. So what are the methods of cable fault detection? Bridge method: bridge method is a traditional method of cable fault detection, which can achieve very ideal results. This method is convenient and fast with high detection accuracy. It belongs to a common cable fault detection method. However, due to the low bridge voltage difference and galvanometer sensitivity, it is only suitable for fault detection with small cable resistance. Moreover, it is difficult to detect the open circuit fault of equipment and cable with high resistance. High voltage bridge method: high voltage bridge method is a common fault detection method in cable fault detection. Its detection principle is that in the high-voltage bridge, when the constant current power supply pierces the cable, it will ensure a large bridge current to a certain extent, so as to form a certain potential difference on both sides of the overall bridge, so as to count the fault points on the basis of coordinating the bridge. This method is suitable for high voltage constant current power supply, and can effectively expand the detection range of high resistance of bridge. Relatively speaking, the result is more convenient and accurate. In addition, for the research theory of bridge method, the characteristics of cable centerline resistance and proportional distribution of the whole line can promote the formation of bridge detection system. Impulse high voltage flashover method: impulse high voltage flashover method is widely used in some methods of cable fault detection. The detection principle of this method is to apply impulse high voltage at the beginning of the faulty cable, so that it can quickly puncture the place where the fault occurs, and record the data information of voltage sudden change at the moment of the fault place. Through the analysis of wired fault point and wired initial data information, the time distance is tested, so as to obtain the fault location and uncertain countermeasures. Low voltage pulse reflection method: when low voltage pulse emission method is used to detect cable fault, low voltage pulse shall be injected into the damaged line. When the pulse is transmitted along the cable to the fault point, when the inappropriate impedance is encountered in the process of transmitting current, the reflected pulse is displayed on the detection device and reflected through the data record of the device, and then the round-trip time difference of the output pulse and the cable wave speed are calculated, so as to obtain the distance between the fault point and the test point. This method is very simple and can make the test results particularly significant. When it is difficult to determine the fault data, it can be detected directly. However, it also has disadvantages, that is, it is not suitable for high resistance fault and flashover fault. Secondary pulse method: for the secondary pulse method, it is effectively applied to form the impulse high-voltage pulse at the moment of the integrated high-voltage generator and introduce it to the cable fault location. On the premise of effectively piercing the fault location, it can prolong the uninterrupted time of arc formation at the fault location after breakdown. Obviously, it must be clear that at the same time, a trigger pulse can trigger the automatic trigger device of the secondary pulse and the operation of the cable detection instrument. On the basis of starting the automatic trigger device of the secondary pulse, two low-voltage pulses are transmitted. Through the device of forming the secondary pulse, the cable is effectively transmitted on the fault detection cable, so as to break down the cable. Using the cable fault detector, observe the floating characteristics of voltage waveform and the reflection wavelength in the whole process of forming arc, comprehensively and systematically record the screen of detection equipment, and distinguish various current fluctuations, one of which reflects the actual length of cable and the other reflects the actual distance of short-circuit fault.
LC Duplex Fiber Connector for High-density Cabling
LC Duplex Fiber Connector for High-density Cabling
Due to its small size, LC connector is the mainstream fiber optic connectors and is widely used in optical communication networks, data networks, and cable television networks. In daily application environment, LC duplex connector used more often because of its cabling space saving. LC duplex fiber optic connector is two simplex LC connectors encased in a common housing. Compared with LC simplex connector, the installation steps are reduced, saving time and money.HYCs LC duplex connector is superior to traditional LC duplex connector, providing an innovative solution for quick unlocking. Compared to the traditional two single connectors, this duplex connector only needs one press to achieve double releasing. As shown in Figure 2,3, the design of this two-core connector has two advantages, one is the longer clip and another is a lower clip. The extended longer latch on top of the connector body makes it easier to disengage from the adapter, even in high-density packaging. If you have the experience of releasing LC duplex connectors in patch panels in high-density cabling, you may know why this is important. Because in the cabling case, thumbs and forefingers are not ideally suited to operate the release lever and pulling the connector. The handle portion of a conventional duplex connector will be slightly higher than the adapter, which will take up more space during the cabling installation. The lower clip design of this LC duplex connector can save more space. In the high-density environment of the data center, the space saved by multiple connectors is combined to have a great advantage.Another important advantage is the ability to reverse polarity. In the optical signal transmission, the optical signal is divided into a receiving end and a transmitting end. The optical fiber link transmitting signal (Tx) at one end of the optical cable must be matched with the corresponding receiver (Rx) at the other end, and the matching is called polarity.Conventional LC fiber jumpers have significant limitations in achieving polarity switching. It is necessary to pay special attention to the direction of polarity transformation to avoid the failure of termination and face the possibility of replacing the jumpers and re-cabling. The ability to switch the polarity of this LC duplex connector makes this operation easier, saving a lot of time and wiring costs by easily switching polarity without any tools.With the rapid application of 5G, how to provide a high-density, low-cost, easy-to-manage, and highly reliable network cabling system for data centers has become an increasingly important requirement. The LC duplex fiber optic connector is a high-reliability, low-cost, high-density cabling solution. Originally published at wordpress. com on April 27, 2019. RELATED QUESTION What is the pipe schedule, pipe class, and which kind of pipes are used? Pipe schedule always signifies the wall thickness of pipe /pipe fittings ,In simple words how thick the pipe is given by schedule , According to Asme standard For butt weld fittings B16.9 std gives you schedulePipe class refers to the material specifications of pipe ,it gives you the grade of pipeFor eg A403 Grwp gives austenite stainless steel pipe classA234 Grwp is for wrought carbon steel pipeDifferent types of pipes1.MetalsA.weldedB .Seamless2.Non metals3.HdpeWhat is the pipe schedule, pipe class, and which kind of pipes are used?.
Cable Tracker to Find Cable Companies in Your Area
Cable Tracker to Find Cable Companies in Your Area
The introduction of cable trackerToday's cable television is a mix of digital and traditional TV. Cable companies are going to lose their dominant position if they don't adapt and cater to the changing needs of their subscribers.Tips for cable trackerTo be successful, you must strive for perfection. You must be able to get all the right information and convince your audience of its importance. However, there is no such thing as perfect information and content. There are always going to be surprises that will catch your audience by surprise and make them unhappy with your work.Don't let this happen to you! Make sure that you get the right information on time and use it properly so that it gets noticed by the audience, not ignored.How to use cable tracker?You can get a cable tracker from an Internet browser. It is an extension that helps you to identify websites and apps that you are interested in. You can use this extension to find cable companies' websites and apps in your area or even find the best deal for your next TV or broadband subscription.If you have a low-end TV, it may be very expensive to have cable company installed in your house. The reason is that it takes time for the cables to get connected, so they need money to be invested on the installation of its network in your home. It is worth knowing that there are many ways of getting this technology installed at lower cost - using a rental service, for example, since it costs less than buying one.This method will save you money because if you decide to buy aThe specifications of cable trackerSmart TV’s can be used for many purposes such as:The product instructions of cable trackerThis article provides a comprehensive overview of the product instruction of a cable tracker.The product instruction is the first thing every customer sees on any cable set-top box. The instructions are usually written by engineers, so it's easy to miss important details. That's why we need a concise and accurate overview so that customers can easily find what they're looking for.The application of cable trackerCable tracker is a marketing tool used by many advertisers to track the progress of their ads across different platforms. It gives the advertiser a real-time view on the performance of their targeted advertisements.
Working Principle of Live Cable Identification Instrument
Working Principle of Live Cable Identification Instrument
As the running live cable is not allowed to damage any grounding wire and other connecting wires, nor is it allowed to directly add the output signal of the live cable identifier transmitter to the cable phase line with high voltage. Two difficult problems need to be solved for live cable identification. One is how to couple the cable identification signal to the cable; Second, the coupled signal is generally small, and the operating cable may have 50Hz power frequency electromagnetic interference composed of 50Hz unbalanced current, induced 50Hz interference current, cable distributed capacitance current, etc. the high-sensitivity receiving caliper has the problem of how to resist 50Hz power frequency interference. The charged cable identification instrument developed by US adopts single chip microcomputer coding and decoding technology and PSK technology widely used in the field of communication. The phase coded signal with an average value of 0 is transmitted on the transmitting caliper, and the single chip microcomputer in the receiving caliper performs phase identification after filtering the received signal by hardware and software. When the receiving caliper cards the cable according to the current direction, the identified cable ammeter deviates to the right, accompanied by audible and visual indication. The current direction of other cables is opposite to that of the identified cable, and the ammeter pointer deviates to the left. No audible and visual indication. This reflects the uniqueness of the identified target cable. It is easy to distinguish the identified cable from multiple cables. In addition, since the signal current strength on the identified cable is the same throughout the line, the electromagnetic signal strength received by the receiving caliper along the cable is the same. In principle, the identified cable is not limited by the length of the identified cable. Dear customers: Hello, our company is a high-quality development group with strong technical force, providing users with high-quality products, complete solutions and superior technical services. The main products are high voltage cable fault tester, cable fault tester, underground cable fault tester, etc. The enterprise adheres to the tenet of building a business in good faith, keeping the business with quality and developing the business with enterprising. It continues to climb new peaks with a firmer pace and make contributions to the national automation industry. New and old customers are welcome to buy their favorite products at ease. We will serve you wholeheartedly!
How to Choose the Right Bnc Coax Cable Tester
How to Choose the Right Bnc Coax Cable Tester
This type of cable supplies power to the device in question and transmits the video signal to the output. The prefabricated Siamese cable is available in various lengths to keep most camera cables at a distance. The optical cable tester includes a plug for visible light sources that is compatible with the optical cable installation.A cable tester is a microcontroller that displays and automates the test process and displays the test results for multi-wire cables. It connects to the end of the cable separately with a display of the current source portion to allow the injection of test current from one end of a cable to detect the results from a remote end.To check a USB cable, you can perform simple USB tests by connecting the cable end to the appropriate port on the cable tester. You can also check your cloud services, data communications and data transmission by testing connection stability with network cable testers.There are a number of methods to test coaxial cables to obtain a reliable signal frequency. Following are the steps to test a coaxial cable with the help of a multimeter probe. This is a reliable method to test the coaxial cable without signal loss.A network cable tester is a revolutionary device designed to test the reliability and capability of cable connections. It is a necessity for network technicians, network testers, cable testers and other related work in this field. Cable network testers are not only reliable, but also able to fix problems and help you identify cable problems and connection problems.The coaxial cable RG-179 uses a 7.5 Ohm BNC connector and can be used in high temperatures. RG-6 coaxial cable is the "coaxial cable for the Internet" - it is used to transmit the signal over the Internet connection (the Internet signal runs at a higher frequency than traditional analog video). It can be operated up to a distance of RG-59 without loss of the video signal, but it is a thick and rigid cable that is not comfortable to work with.The RG-174 coaxial cable uses the 50 ohm BNC connector and is thin enough for wide applications such as GPS navigation antennas for cars and many vehicles. RG58 coaxial cables use the 50 ohm BNC connectors and are versatile due to their performance. The RG-59 coaxial cable is used to transmit video signals from a CCTV camera to a monitor in another room.Although 75 Ohm coax is likely the impedance found in most of today's applications, it is important to note that all components of a coaxial cabling system must have the same impedance to avoid internal reflections at connecting points that can cause signal loss and poor video quality. High-capacity cables can distort the transmission of digital signals by reducing the distinction between graduated peaks and sinks. 75 ohm coaxial cables are therefore of great benefit for digital transmission, and their lower capacity than 50 ohm cables ensures that all digital transmission passes through the wire with minimal losses or distortions.Digital Signal 3 signals (DS3 signals), which are used to transmit data traffic to the control panels, are called T3 lines and use coaxial cables comprising 7.5 ohms (type 735) and type 734. Type 735 cables are used for distances of up to 6.9 metres, while type 734 cables can be used for distances of up to 13.7 metres.There are various types of adapters for BNC connectors, including T connectors, cylinder connectors and terminators. They can be plugged into any type of connector or SDI signal transport connector.Choosing the right cable is a major problem that plagues most companies and teams. Choosing the right BNC connector for the cable for your project comes at a price. To avoid problems with your network, use BNC connectors instead of compressing or bolting cables.This guide to cabling security cameras provides a practical explanation of the cable types of surveillance cameras and termination cables for easy installation. Siamese cables for surveillance cameras are a two-wire solution with a cable assembly that enables easy video and power transmission to the BNC camera. Curveball Cat5E and Cat6 cables are used to send the video signal to the camera using a video balun adapter.When using a video balun network, the cable does not tip over and requires the lead wire to be exposed by removing the outer layer of the wire at each end.Connect one end of the coaxial cable tester to the socket and bring the other end to a point where several coaxial signal cables meet. The video signal and power supply are transmitted via a single network cable, similar to how Siamese cables work. Another method for network cables is to crimp the RJ45 connector and plug it into the socket of a video power baloon.When you touch the multimeter probe on the end of the right coaxial cable, the meter reads 0 but you will see different readings on the other cables.If your coaxial cable is on the wall, connect an end of the coaxial cable tester to the wall plate and point the other end to the tester to facilitate assembly of the entire cable. To find the right cable, touch the cable one way or the other and a beep will be generated. If it is the antenna on your roof, you can use a multimeter with an aluminum coil to track the right end of a particular coaxial cable.Once you traced and identified the coaxial signal of the cable that you want to test with a multimeter, the next step is to figure out how to perform the task. Touch the center of the conductor end of your coaxial cable with the multimeter probe.Confirm that the shielding patency at both ends of your coaxial cable is in good condition. A second test should be performed on the coaxial cable to determine the status of the screen continuity.
Brief Introduction of Intelligent Handheld Cable Tester
Brief Introduction of Intelligent Handheld Cable Tester
Intelligent handheld cable tester Handheld cable tester generally adopts pulse reflection method. Judge the fault point according to the returned waveform. The waveform returned during each test will be different due to some external reasons. Therefore, the requirements for the working experience of users are relatively high. In view of this situation, TFN launched an intelligent handheld cable fault tester. The intelligent handheld cable fault tester is equipped with AGC (digital gain automatic control) system; Digital waveform automatic recognition technology; ARM CPU with FPGA technology. The machine automatically recognizes the waveform and judges the fault point. There is also waveform comparison function, which can make you learn waveform recognition faster. Instrument introduction: D131 series cable fault obstruction intelligent rangefinder is suitable for automatically measuring the precise position of core wire obstacles such as broken wire, mixed wire and ground gas of power cable and communication cable. The d131 series is characterized in that it can automatically test many typical faults. The specific features are as follows: 1) DAGC (digital gain automatic control) system: digitally adjustable gain. Eliminate the waveform distortion of the original instrument of the same type due to the potentiometer knob. It can also be used for pure linear adjustment, which is conducive to manual testing. 2) Digital waveform automatic recognition technology: rely on the machine to automatically recognize the waveform that is difficult to judge manually. 3) Using ARM CPU and FPGA technology, it can quickly carry out various complex operations and accurately judge the fault waveform. 4) Waveform comparison function is convenient to compare the test waveforms of fault line and normal line, and clearly locate the fault point. 5) Large screen color LCD display, humanized interface menu design, fast digital buttons, convenient for users to operate. 6) High energy lithium battery can be used for up to ten hours (charging with a special charger). 7) Wave speed memory, power on after power off, and the wave speed is automatically set to the wave speed at the last power off. fqj
HYC Exclusive Patented Design  Polarization Maintaining(PM) Optical Fiber Connector
HYC Exclusive Patented Design Polarization Maintaining(PM) Optical Fiber Connector
What is Polarization Maintaining(PM) fiber?Theoretically, the fiber is a circular core which should not produce birefringence, and the polarization state in such a fiber will not change during transmission. In practice, there is always some external forces or other reasons which makes the fiber uneven or curved, and will cause a small amount of birefringence. When the fiber is subject to any external interference, such as wavelength, bending of the fiber, temperature and other factors, the polarization state of light will become chaotic when transmitted in polarization-maintaining fiber. Polarization Maintaining Optical Fiber (PM Fiber) is such a specialty fiber with strong birefringence that is generated by the design of optical fiber geometry. It can effectively solve the problem of polarization state change by eliminating the effect of stress on the polarization state of incident light. If the polarization of the light incident on the fiber is aligned with one of the birefringence axes, the polarization state will remain even if the fiber is bent. This polarization maintaining feature is extremely important for some special applications that require a polarized light input.How does the polarization maintaining (PM) patch cord work?Polarization maintaining(PM) patch cord maintains the coupling alignment of two Polarization modes by precise connector keys. Compared with the traditional optical fiber patch cord, the PM optical fiber patch cord has the advantages of polarization-maintaining optical fiber transmitting polarized light signal, keeping the direction of linear polarization unchanged, improving the coherent signal-to-noise ratio, and realizing high precision measurement of physical quantity. The polarization maintaining connector is an important component of two polarization maintaining fiber coupling, which ensures that the polarization mode of two PM optical fibers maintain the original polarization state of polarized light, and maintains a high extinction ratio for transmission. This requires precise docking of the slow or fast axes of the two fibers to minimize the angle error. By aligning the polarization direction of the polarized light with one of the axes, the polarization component assigned to the other axis is small, thereby maintaining the polarization state of the transmitted light. The polarization Angle and extinction ratio reflect the degree of polarization.360 ferrule rotation adjustable Polarization Maintaining(PM) optical fiber connectorTo meet the requirements of some special applications, HYC has developed a new type of polarization maintaining connector. HYCs exclusive patented design of this polarization-maintaining connector has a 360 ferrule adjustable. During the process of assembling, the polarization axis of fiber is aligned with the connector key by rotating the ferrule until the polarization axis is aligned with the connectors keyway. Compared with the traditional fiber adjustment method, it takes a shorter time to operate, which greatly improves the assembly efficiency. The polarization maintaining angle can be controlled within 1, and the high extinction ratio is maintained above 25dB. PM fiber patch cord products have the advantages of high precision, low loss, ultra-high extinction ratio, convenient manufacturing technology, high efficiency, higher maneuverability and patent protection, etc. They are widely used in many fields such as aerospace, navigation, unmanned driving system, communication, highly sensitive interferometer, poly-deviation wavelength division multiplexer, and other fields.HYC Co.,LtdHYCis a national Hi-tech optoelectronics company engaged in R&D, manufacture and marketing of fiber optical products. Providing professional product and service for fiber connectivity,WDM, PLC splitter and high density datacom cabling. HYC products and solutions widely applied in 4G/5G, Data Center and Cloud Computing industry
Precautions for Use of Cable Fault Tester
Precautions for Use of Cable Fault Tester
The tester adopts low-voltage pulse method and high-voltage flashover method to detect various faults of cables, especially the flashover and high resistance faults of cables can be tested directly without burning through. If equipped with acoustic method pointing instrument, it can accurately determine the precise position of the fault.Precautions are as follows:1) First of all, it is necessary to list the possible causes of the fault and the basic situation of the cable, such as whether the fault is caused by operation or pre-test, whether it is a new cable or a cable with long operation time, the approximate length of the cable, whether there is a joint in the middle of the cable, whether the cable has failed before, whether the cable is directly buried or laid in the cable trench, and the type of cable, etc.2) Make sure that the cable is tested only when there is no power. Both ends of the cable of the cable fault tester must be disconnected from other lines to ensure that the cable is dead and the surrounding environment of the cable is in a safe state.3) The tester must pay attention to the operation safety. Before wiring with the cable each time, connect each phase line of the cable to the ground with a short line for discharge. During discharge, one end of the short line must be grounded and the other end must be connected to each phase line of the cable for discharge. For other electrical appliances, such as capacitors, test transformers, etc., pay attention to discharge before wiring and removing the connecting wire. In short, we should form operation habits and be not afraid of trouble. Before each operation, first pay attention to whether the operating electrical appliances are connected with the circuit, and then discharge before operation.4) When testing the cable fault tester, first use the low-voltage pulse function of the flash tester to test the full length of each phase of the cable respectively to see whether the test waveform is consistent during the three relative tests. For most high resistance faults, the test waveforms of each phase are consistent. For low resistance fault and high resistance fault with open phase fault, the fault phase test waveform is inconsistent with the total length of the tested cable, so the fault distance can be measured directly with low-voltage pulse.5) When the high voltage flashover method is used for testing, whether the cable fault is high resistance fault or low resistance fault, the high voltage impulse flashover method can be used for testing. For the low resistance or broken line fault that can directly test the fault distance with low-voltage pulse, it is generally necessary to use high-voltage impulse flash for verification test and accurate location of fault point.
How to Better Find the Fault of Buried Cables in Rural Areas
How to Better Find the Fault of Buried Cables in Rural Areas
In the transformation of China's agricultural network, buried lines have been adopted in many areas. Although PVC insulated plastic wire has many advantages, such as good chemical stability, no occupation of farmland, safe operation and reduction of line loss, after long-term use, due to various reasons, the fault phenomenon of buried wire is gradually increasing. Let's take a look at how to carry out the fault finding of buried cables in rural areas. Methods and characteristics of fault finding and detection of buried cables in rural areas. 1. Analysis and judgment method for the fault of buried line, generally, we should first understand the relevant situation of the fault, then conduct comprehensive analysis, find out the cause of the fault, and then find and eliminate it pertinently. For example, finding informed parties, such as construction workers, wire users, and other relevant personnel to understand the situation in detail, can often eliminate the fault in the shortest time and at less cost. It has the advantages of simple operation, no need for complex instruments, and can eliminate some faults in time. This method is generally not used alone, but in combination with other instrument detection methods. 2. In recent years, the intelligent cable fault tester is widely used to detect the fault buried wire. Therefore, many electricians and maintenance personnel are not familiar with the fault finding and detection methods of rural buried cables. In case of underground pipeline failure, if there is no advanced detection equipment and good detection means, the failure can often not be eliminated within the service period promised by the power supply enterprise, which not only delays time and wastes manpower, but also affects the image of power users and frustrates the enthusiasm of farmers to transform the rural power network. Therefore, rural land buried lines need more specialization. More efficient fault detection equipment. 3. Compared with buried wires, buried power cables have been used in China for decades. The buried cable fault tester has developed from resistance bridge, capacitance bridge and standing wave test to flashover test. The development of the instrument has experienced the ordinary oscilloscope tube display flash lamp and the storage oscilloscope tube display flash lamp. At present, the intelligent instrument has been developed. The instrument adopts new technologies and processes such as large-scale integrated circuit, computer processing technology and large screen LCD. The power cable tester is used to transform it and detect the buried line fault. The effect is good and the efficiency is high. After a lot of practice, the detection of a buried line fault generally does not exceed 30 minutes from the beginning to the end, and the accuracy is very high.
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