Buried Wire Locator Buying Guide

Buried Wire Locator Buying Guide

2021-11-11
NOYAFA
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SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED leads the industry in bringing high-quality buried wire locator. The product defines the meaning of remarkable quality and long-lasting stability. It is characterized by stable performance and reasonable price, which is essential for customer measuring product potential. And the product is comprehensively certified under multiple certifications to prove innovation achievements.NOYAFA products are loved and sought after by many Chinese and Western providers. With great industrial chain competitiveness and brand influence, they enable companies like yours to increase revenue, realize cost reductions, and focus on core objectives. These products receive numerous praise which underlines our commitment to provide total customer satisfaction and to over-achieve goals as your trusted partner and supplier.Best Cable Tester Supplier in China _ Noyafa has been specialized in this industry for years. There are complete services provided to clients, including shipping service, sample delivery and customization service. Our wish is to be your buried wire locator partner and bring you a lot of interests in return.
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Do You Know How to Purchase Cable Fault Tester
Do You Know How to Purchase Cable Fault Tester
In today's society, electricity is one of the indispensable and important resources in people's life. Cables bear the responsibility of transporting electric energy. We all know that anything used for a long time may fail, and so does cables. Cable fault detector is a special equipment to solve cable fault. Xiaobian will show you how to purchase cable fault tester today. Electric power has been a necessary resource for people's daily life. The State Grid is all over the country. Due to the actual needs of cable production process fault resolution and customer site cable fault location, not only cable manufacturers buy cable fault detectors to solve all kinds of cable faults in the actual cable production process and customer use site. Power companies rely on cable fault tester to accurately and quickly solve cable fault points and quickly modify power (or communication) faults. Therefore, the configuration of cable fault tester is different according to different occasions and requirements. As a cable manufacturer, when purchasing the cable fault detector, it is purchased in complete sets of high and low voltage, and the equipment components are 6-10 pieces. In case of direct buried cable fault location at the customer's site, the handling and transportation of the whole set of equipment must be transported by a special cable fault detection vehicle, otherwise the transportation quality of the instrument is not guaranteed. There are also some special cable fault detectors, such as the railway household coat cable fault detector. More specifically, it can be called the railway single core cable outer sheath fault tester. These two configured cable fault testers are suitable for railway. According to the characteristics of railway cable outer sheath fault, under the condition of separation of cable sheath and shielding layer, The bridge method or voltage drop method is used to initially measure the grounding fault of the cable outer sheath, and then cooperate with the special receiver to accurately find the fault point. At present, the cable fault detector sold on the market is mainly divided into two types: 1. It is a cable fault detector designed according to the principle of echo method: the components mainly include intelligent waveform detection analyzer, Pathfinder, DC high-voltage generator (including console and AC / DC high-voltage test transformer), capacitance, ball gap, pointing instrument, etc. 2. It is a cable fault detector designed and manufactured according to the principle of bridge method: the components mainly include fault location bridge (high and low voltage bridge), pointing instrument, path instrument, wave reflection fault location instrument, etc. The above two kinds of cable fault detectors include coarse side positioning part and accurate fixed point part of cable fault. Intelligent cable fault tester will be a new demand. The above is the purchasing knowledge of cable fault tester. I hope it can help those in need.
Tips to Clean Stainless Non Contact Voltage Tester
Tips to Clean Stainless Non Contact Voltage Tester
You do not want to use hard abrasives or chemicals that leave a dirty film or stain on the surface. Avoid abrasives and abrasive powders such as steel wool, as these can scratch and damage the finished material. Avoid using abrasive powder or steel wool with bleach or ammonia, which can damage the texture and shine of the stainless steel surface.Some popular cleaning products can damage the surface of stainless steel, and clear water can leave marks and stains if not used properly. Do not use gravelly, dirty or hard water as it can leave stains and brownish stains. Choose a cleaner that is designed for use with stainless steel and start with a gentle cleaner that you can use with a little elbow grease to clean the surface.A soft cloth, moistened with warm water, is sufficient for general cleaning. Use a grease cleaner available at your local hardware store or grocery store and follow the manufacturer's instructions. Apply a non-abrasive cleanser like a soft scrub with a damp sponge and rub off the cleaner.Most filters can be placed in the dishwasher at low heat for a short cycle with a phosphate-free detergent. Of course, like other items in a dishwasher, filters can collect food residues. Filters can be washed by hand in warm water with a phosphate-free detergent such as Dawn.A light paste of baking soda and water acts as a light abrasive to neutralize the remaining acid. Apply the paste to the clean surface with a soft sponge and rub off any haze that might affect the surface or pattern towards the existing surface.Clouds can lead to a stain that can be cleaned so that when removed it is too thin to spread a blurry film. Non-powder coated metal parts, including hardware, are susceptible to corrosion and discoloration. It is recommended to pay special attention to these components during cleaning.There are numerous non-abrasive cleaners and polishes specifically designed for the use of stainless steel. Utilising something like Bon-Ami (r) Cleaner for non-coated or coated surfaces can help minimize corrosion and maintain the appearance of non-coated metal lift components, including hardware. My personal favorite for stainless steel cleaning is the 3M stainless steel cleaner (available on Amazon), but there are several other recommended brands available, including Bar Keeper Friends (available on Amazon ), Cerama Bryte (available on Amazon ), Sprayway (also available on Amazon) and Weiman (available on Amazon ).To make things easier, we have our own brand of water-based stainless steel cleaners that clean gloss, scratches and water stains while retaining the original surface of the stainless steel. If in doubt, test your stainless steel by cleaning the surfaces hidden on the back and sides and then moving the clean stainless steel into visible areas, including the front of the appliance and the tops of the kitchen counters. If you hesitate with stainless steels other than household appliances, there are finishing options such as Classic White, Black, Matte Black and Black Stainless Steel.For cleaning you can use alcohol or other household cleaners such as formula 409, lysol (r) or pine sol (r). Stainless steel is an iron-based alloy that contains chromium that combines with oxygen to form an invisible protective film on the surface, but this film is not stainless. Follow the above procedures to inspect and maintain sealed steel rails and ladders.Non-contact voltage testers are a safe method to ensure that the wires are not touched by current. They light up and make no noise when they come near hot, current-carrying wires, especially those covered with plastic insulation. If you hear continuous chirping or see a series of flashes, this confirms that the tester has detected voltage.On Android, make sure Bluetooth is turned on in your phone's settings and start the tying process on Android. To do this on iOS, your mobile device under the hood must be connected via Bluetooth. If you do not find a device named Zephyr XXX under the hood on iOS during this process, make sure the device is in mating mode.The newest and best commercial cleaners are not the best, but stainless steel cleaners are the safest. Try out some DIY cleaners on your appliances to see for yourself and remember to test the stainless steel cleaner on site before using it.
How to Quickly Locate Cable Faults
How to Quickly Locate Cable Faults
With the different cable laying methods, the difficulty of cable fault location is gradually increasing. Among them, the positioning and search of bridge, tunnel and open laying in ditch is relatively simple, and the positioning and search of direct burial is the most difficult. When the fault nature is simple, the special cable fault location equipment can be used to locate the fault within dozens of minutes. When the fault is special, it often takes 4-5 days or even longer to locate the fault. How to quickly locate cable faults? When using echo method for cable fault location, sometimes by transferring the fault phase and wiring mode, complex faults are often transformed into simple faults, and the fault location is quickly determined to win time for the emergency repair of on-site lines, which is of great significance to the power supply user department. Low voltage power cables are generally multi-core cables. After laying and continuous use, 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 a 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 cross-section copper core directly buried power cable (35mm2 and below) and aluminum core cable may be accompanied by short-circuit and wire breaking fault at the same time. During on-site detection, changing the short-circuit fault to wire breaking 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 insulating core fails, the inner lining may have been damaged. In case of special cable insulation fault, it is difficult to collect waveform with professional cable fault instrument. It can be considered to use the acoustic method to apply the high-voltage pulse directly between the steel strip and copper shielding layer of the cable, which will often be fixed quickly. In the field measurement process, we also found that when using the acoustic measurement method to locate the fault point of low-voltage cable, when the high-voltage line and ground wire are connected between the bad phase and the metal shield or armor, 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 site for many times, it is found that if the distance between the discharge ball gap is appropriately increased, and the high voltage and grounding wire are connected between the two phases of the fault, the discharge sound will become larger and the fault point will be determined quickly.
A Brief Overview on the Lcd Cable Tester
A Brief Overview on the Lcd Cable Tester
It displays an "X" to indicate that the idle length is less than 90% of the other wires of the pair and length, and that it is 8.93 m from the tester. The open circuit is located between 10 and 90% of the cable length and is measured at the next end of the connector. Find the open circuits and the function of the pair / length tester using the details in this section.If the pair length measurement is performed under normal conditions, it will be displayed as shown below. The length measurement of the LCD cable tester can be performed under normal conditions and the display is shown below.To test the cable length, connect one end of the cable to the main tester. Always check the cable for errors such as idle, short circuit, reverse connection or crossover. Never use a cable length tester to test a live connection such as a 220 V power supply, as this can cause damage to equipment or people.The CableEye tester also detects diodes embedded in cables, so you can test and learn new cables. When you connect both ends of the cable to a network, the cable tester does the job and you get an accurate measurement of whether your cable is working or not.Simple diode connections are drawn with standard diode symbols, while complex diode networks appear as a floating list in the schematic window. Copper Technicians Kit (MS) POE Kit microscanner (tm) is a POE - - tester that displays available class 0-8-8023AT - POE devices, voltages, service-available passive POE sources, 10G Ethernet cable lengths, cable branches and error distances. The POE kit includes an Intellitone Pro 200 probe that receives active data from the cable via digital audio tracking, six remote controls that locate the cable to be tested and a magnetic suspension strap that allows you to hook the tester on a nearby magnetic surface or hook.MicroScanner2 MicroScanner Poe provides engineers with the vision to verify today's most common voice, data and video services. The MS2 kit Microscanner2 cable verifier displays a graphical wiremap of each pair (length, distance and error) on each end of the device. The MicroScanner series defies convention by displaying key test results, wiremap and cable ID on the other end of each device on a single screen.The next topic is, as in the previous TOC topic, the use of barcode scanners to meet the demand for greater data security and to ensure consistent and fast production tests.The section Settings provides general information about Advanced Cable Tester v2 with the ability to change the Core Settings. In this version new macro instructions include: wait scan (stead of pushbutton wait pb), enter operator name immediately, change operator macro timestamp to record date and time of test, database archive, open and resume log file, resume, add cable, create log file.The Settings section also displays information specific to the Advanced Cable Tester V2 device. The device name appears in the main navigation header of the advanced cable tester web application v2.As soon as the requirements are fulfilled, the Advanced Cable Tester v2 will start to be ready for operation. As soon as the device detects that the cable has been inserted into the two sockets, it enters the test state. When the cable connection module is removed, the device returns to its non-operational state and the user must select a test profile to continue the test.When a valid Cable Plug-In Module is installed and a valid test profile is selected, Advanced Cable Tester V2 is ready. As soon as it is ready, the cable tester runs the test profile until a cable is detected.Consumers can use the portable network cable tester with the cables RJ11, RJ12, RJ45, Cat 3, Cat 5E, Cat 6 and Cat6A. The broad compatibility of the device does not complicate your work in the analysis of cable connections.Selecting, selecting and purchasing a suitable network cable tester can be a complicated and challenging task. Purchasing the right network cable tester can save you a lot of inconvenience and trouble.To help you find the best network cable tester for your use I have compiled a list of test products that work well. 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.
The Optical Fiber Connector
The Optical Fiber Connector
A fiber optic connector is a detachable (active) connection between an optical fiber and an optical fiber. The two end faces of the optical fiber are precisely butted together so that the optical energy output from the transmitting optical fiber can be coupled to the receiving optical fiber to the maximum extent. It also minimizes the impact on the system due to its involvement in the optical link, which is a basic requirement for fiber optic connectors. To some extent, fiber optic connectors affect the reliability and performance of optical transmission systems.Basic introductionA connecting device for re-plugging between optical fibers, also called a fiber optic movable joint. The main performance parameters (and typical values) are: insertion loss ( 5dB), plug-and-repeat repeatability and interchangeability between connectors (500 changes). When used in a large-capacity high-speed transmission system, reflection is also required to be small.IntroductionOptical fiber connectors can be divided into single-mode and multi-mode connectors of common silicon-based fibers according to different transmission media, and other fiber-optic connectors such as plastics; the structure of the connector can be divided into: FC , SC, ST, LC, D4, DIN, MU, MT, etc. Among them, ST connectors are usually used for wiring equipment terminals, such as fiber distribution frames, fiber modules, etc.; and SC and MT connectors are usually used for network equipment terminals. According to the shape of the end face of the fiber, there are FC, PC (including SPC or UPC) and APC; according to the number of cores of the fiber, there are also single core and multi-core (such as MT-RJ). Fiber optic connectors are used in a wide variety of applications. In the actual application process, we generally distinguish according to the structure of the fiber optic connector. Here are some common fiber connectors:FC type fiber optic connector This connector was first developed by NTT Japan. FC is an abbreviation of Ferrule Connector, which indicates that the external reinforcement method is a metal sleeve and the fastening method is a turnbuckle. At the earliest, FC type connectors, the mating end faces of the ceramic pins used were planar contact (FC). The connector has the advantages of simple structure, convenient operation and easy manufacture, but the fiber end face is sensitive to fine dust, and Fresnel reflection is easy to occur, and it is difficult to improve the return loss performance. Later, this type of connector was improved by using a pin (PC) with a spherical end face, and the external structure was not changed, so that the insertion loss and return loss performance were greatly improved.SC type fiber optic connector This is a fiber optic connector developed by NTT Corporation of Japan. The outer casing has a rectangular shape, and the structure of the pin and the coupling sleeve is exactly the same as that of the FC type. The end face of the pin is mostly made of PC or APC type; the fastening method is a plug-and-pin type, which is not required. Rotate. Such connectors are inexpensive, easy to insert and remove, have small fluctuations in insertion loss, high compressive strength, and high installation density.The ST and SC interfaces are two types of fiber connectors. For 10Base-F connections, the connectors are usually ST type. For 100Base-FX, the connectors are mostly SC type. The core of the ST connector is exposed and the core of the SC connector is inside the connector. Biconic Connector The most representative of these types of fiber optic connectors was developed by Bell Laboratories of the United States. It consists of two precision-molded ends with frusto-conical cylindrical plugs and a double-conical plastic sleeve inside. The coupling assembly of the barrel.DIN47256 fiber optic connector This is a connector developed by Germany. The connector and coupling sleeve of this type of connector have the same structural dimensions as the FC type, and the end face treatment adopts PC grinding. Compared with the FC type connector, the structure is more complicated, and the internal metal structure has a spring that controls the pressure, so as to avoid damage to the end surface due to excessive insertion pressure. In addition, the mechanical accuracy of such a connector is high, and the value of the insertion loss is small. MT-RJ type connector MT-RJ started with the MT connector developed by NTT, with the same latching mechanism as the RJ-45 LAN electrical connector. The optical fiber is aligned with the guide pin mounted on both sides of the small sleeve for easy transmission and reception. The machine is connected, and the connector end face fiber is a double-core (interval 0. 75mm) arrangement design, which is the next-generation high-density optical connector mainly used for data transmission.LC connector The LC connector was developed by the famous Bell Institute and is manufactured using a convenient modular jack (RJ) latch mechanism. The size of the pins and sleeves used is half that of ordinary SC, FC, etc. , which is 1. 25 mm. This can increase the density of the fiber optic connectors in the optical distribution frame. At present, in the single-mode SFF, the LC type connector has actually occupied a dominant position, and the application in multi-mode has also grown rapidly.MU type connector The MU (Miniature Unit Coupling) connector is the worlds smallest single-core fiber optic connector developed by NTT based on the most widely used SC-type connector. The connector uses a 1. 25mm diameter bushing and self-retaining. The advantage of the organization is that it enables high-density installation. With MUs l.25mm diameter bushings, NTT has developed a series of MU connectors. They have socket type optical connectors (MU-A series) for fiber optic cable connection, backplane connectors with self-holding mechanism (MU-B series), and simplified sockets for connecting LD/PD modules and plugs (MU-SR series) )Wait. With the rapid development of fiber-optic networks to larger bandwidths and larger capacity and the widespread use of DWDM technology, the demand for MU-type connectors will also grow rapidly.MC connectorIn 2012, the domestic communication company independently developed a smaller and denser MC connector than the LC connector. The Nippon MC Fiber Optic Active Connector is a high-density single-core fiber optic connector for high-density applications such as high-capacity central rooms and high-density data centers. The MC fiber optic connector has a high density and can double the LC connector in the same space, making it the worlds smallest and densest connector.The main parameters:General structureThe main purpose of fiber optic connectors is to achieve fiber optic connections. Optical fiber connectors that have been widely used in optical fiber communication systems are numerous in variety and structure. However, the basic structure of various types of fiber optic connectors is consistent, that is, most fiber optic connectors are generally made of high-precision components (composed of two pins and one coupling tube). Alignment of the fiber.In this method, the fiber is inserted into and fixed in the pin, and the surface of the pin is polished to achieve alignment in the coupling tube. The outer components of the pins are made of metal or non-metal materials. The butt end of the pin must be ground and the other end typically uses a bend limiting member to support the fiber or fiber optic cable to relieve stress. The coupling tube is generally made of two semi-synthetic, fastened cylindrical members made of ceramic, or bronze, and is equipped with a metal or plastic flange to facilitate the mounting and fixing of the connector. In order to align the fiber as precisely as possible, the processing precision of the pin and the coupling tube is very high. PerformanceThe performance of fiber optic connectors, first of all, optical performance, in addition to the interchangeability, repeatability, tensile strength, temperature and number of insertions and removals of fiber optic connectors.(1) Optical performance: For the optical performance requirements of the optical fiber connector, the two most basic parameters of insertion loss and return loss are mainly used.Insertion loss (InsertionLoss) is the loss of the effective optical power of the link caused by the introduction of the connector. The smaller the insertion loss, the better. Generally, the requirement should be no more than 0.5dB.ReturnLoss (ReflectionLoss) refers to the ability of the connector to suppress the reflection of the link optical power, and its typical value should be no less than 25dB. In the practical application of the connector, the surface of the pin has been specially polished to make the return loss larger, generally not less than 45dB.(2) Interchangeability and repeatabilityThe fiber optic connector is a universal passive device. For the same type of fiber optic connector, it can be used in any combination and can be used repeatedly. Therefore, the additional loss introduced is generally less than 0.2 dB.(3) Tensile strengthFor a good fiber optic connector, the tensile strength is generally required to be no less than 90N.(4) TemperatureGenerally, fiber optic connectors must be able to operate at temperatures between -40oC and 70oC. (5) Number of insertions and removalsThe fiber optic connectors used can be plugged and unplugged more than 1000 times.Connection step1. The Fiber Optic Quick Connector is an innovative field termination connector that includes factory pre-installed fiber, pre-cast ceramic ferrules, and a mechanical splice mechanism.2. When the termination is completed, only the introduction fiber or the indoor fiber can be inserted into the mechanical connection mechanism, without using other tools, the termination process takes only about 2 minutes, which greatly saves the installation time. 3. The ferrule and end face of the fiber optic quick connector are pre-ground and pre-polished at the factory, and the mechanical connection mechanism is located at the end of the ferrule to fix the inserted fiber.4. The mechanical connection mechanism is mainly composed of a V-shaped groove and a clamping element; when a fiber needs to be inserted, the V-shaped groove is opened by a wedge-shaped clamp to facilitate the smooth insertion of the optical fiber.5. When the fiber is inserted into the V-groove and fixed, remove the wedge clamp from the V-groove. In order to facilitate users to better understand and select fiber optic connectors, Konnra Electronics hereby organizes the knowledge and classification of fiber optic connectors, and hopes to be helpful to the majority of users RELATED QUESTION Do I have to acquire some type of license to sell medical equipment on an e-commerce site? You need narrow down u201cmedical equipmentu201d its just to general, you have x-ray, mri, ultrasound, c-arms, laboratory, surgical equipment, sterilizing, furniture, ICU, patient monitoring, anaesthesia etc. to say some but the list goes on and onRegardless of the ecommerce site or a website of your own the u201cregulationu201d part comes mostly around your product and your operations;About the products:Will the equipment be new or used?Which country manufactures the product?Who and how are you importing or buying the equipment?FDA clearance is a must for the US market, many europe countries (if not all) ask for CE certificate as a must to enter the country, ISO for manufacture is optional but desireable.About your operations:Are you legally constituted?Does your federal or local government require special permits for healthcare business?Do your products imply any additional risks such as gamma expossure or x-ray?Shipping your products require special handling or additional permits?Hope it helps, for specific questions Iu00b4d be happy to answer through however quora allows you to contact me have a nice day!Do I have to acquire some type of license to sell medical equipment on an e-commerce site?.
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.
Cable Fault Detection and Search Method
Cable Fault Detection and Search Method
For direct short circuit or broken cable fault, the multimeter can be used for direct measurement and judgment; For indirect short-circuit cable fault and grounding cable fault, use a megger to telemeter the insulation resistance between core wires or the insulation resistance between core wires and ground, and judge the cable fault type according to its resistance value. The following describes the method of cable fault finding: zero potential method. Zero potential method is also known as potential comparison method. It is suitable for short cable core to ground fault. This method is simple and accurate, and does not need precision instruments and complex calculation. The measurement principle is as follows: connect the cable fault core wire in parallel with the comparison wire of the same length. When applying voltage ve at both ends of B and C, it is equivalent to connecting the power supply at both ends of two parallel uniform resistance wires. At this time, the potential difference between any point on one resistance wire and the corresponding point on the other resistance wire must be zero. On the contrary, the two points with zero potential difference must be the corresponding points. Because the negative pole of the micro voltmeter is grounded and equipotential with the cable fault point, when the positive pole of the micro voltmeter moves to the point when the indicated value is zero on the comparison wire, it is equipotential with the cable fault point, that is, the corresponding point of the cable fault point. S refers to single-phase knife switch, e refers to 6e battery or 4 No. 1 dry batteries, and G refers to DC microvolt meter. The measurement steps are as follows: 1) connect battery E on phase B and C core lines, and then lay a comparison conductor s with the same length as the fault cable on the ground. The conductor shall be bare copper wire or bare aluminum wire, with equal cross section and no intermediate joint. 2) The negative pole of the micro voltmeter shall be grounded, and the positive pole shall be connected with a long flexible conductor. The other end of the conductor shall be fully contacted when sliding on the laid comparison conductor. 3) Close the knife switch s, slide the end of the flexible conductor on the comparison conductor, and the position when the microvolt meter indicates zero is the position of the cable fault point. High voltage bridge method high voltage bridge method is to measure the DC resistance of cable core with double arm bridge, then accurately measure the actual length of cable, and calculate the cable fault point according to the positive proportional relationship between cable length and resistance. For direct short circuit between cable cores or short circuit point, the contact resistance is less than 1 & omega; The judgment error is generally not greater than 3m, and the contact resistance at the fault point is greater than 1 & omega; The resistance can be reduced to 1 & Omega by increasing the voltage and burning through; Next, measure according to this method. When measuring the circuit, first measure the resistance R1 between core wires a and B, R1 = 2RX R, where Rx is the phase resistance value from phase a or phase B to the cable fault point, which is only the contact resistance of the short contact. Then move the bridge to the other end of the cable and measure the DC resistance R2 between A1 and B1 core wires, then R2 = 2R (l-x) r, and R (l-x) is the phase resistance from A1 phase or B1 phase core wire to the cable fault point. After measuring R1 and R2, short circuit B1 and C1 according to the circuit shown in Figure 3, and measure the DC resistance value between B and C core wires, then 1 / 2 of the organization is the resistance value of each phase core wire, expressed by RL, RL = RX R (l-x), from which the contact resistance value of the fault point can be obtained: r = R1, r2-2rl table. Therefore, the resistance value of the core wires on both sides of the fault point can be expressed by the following formula: RX = (r1-r) / 2, R (l-x) = (r2-r) /2. After the three values of Rx, R (l-x) and RL are determined, the distance X or (l-x) between the fault point and the cable end can be calculated according to the proportional formula: x = (Rx / RL) l, (l-x) = (R (L-2) At the end of the cable, measure the capacitance currents IA1, IB2 and IC3 of the core wire of each phase to check the capacitance ratio between the intact core wire and the broken core wire, and preliminarily judge the approximate point of the broken wire distance. According to the capacitance calculation formula C = I / (2 & PI; Fu), when the positive voltage U and frequency f do not change, C is directly proportional to I. because the frequency of power frequency voltage is f (frequency) Constant, as long as the applied voltage is kept constant during measurement, the ratio of capacitance to current is the ratio of capacitance. If the total length of the cable is l and the distance of the core wire breaking point is x, then IA / ic = L / x, x = (IC / IA) 50. In the process of measurement, as long as the voltage remains unchanged, the reading of ammeter is accurate and the total length of cable is measured accurately, the measurement error is relatively small. The so-called sound measurement method is to find out according to the discharge sound of faulty cable. This method is more effective for the flashover discharge of high-voltage cable core to insulating layer. The equipment used in this method is DC withstand voltage tester. TB is high-voltage test Transformer, C refers to high-voltage capacitor, ve refers to high-voltage rectifier silicon stack, R refers to current limiting resistance, Q refers to discharge ball gap, and l refers to cable core. When capacitor C is charged to a certain voltage value, the ball gap discharges to the cable fault core, and the cable core discharges to the insulating layer at the cable fault, producing a loud and loud spark discharge sound. For open laying cables, it can be found directly by hearing. If it is buried electricity For cable, first determine and mark the cable direction. When searching, put the pickup close to the ground and move slowly along the cable direction. When the sound of Zi and Zi discharge is the largest, this is the cable fault point. Pay attention to safety when using this method, and assign special personnel to monitor at the end of the test equipment and the end of the cable. The cable fault locator produced by our company can not only measure the sound, but also To detect the magnetic signal, the signal strength is displayed visually and synchronously, which can locate the cable fault point faster and more accurately.
Why Hand Held Security Metal Detectors Is the Better of the Other
Why Hand Held Security Metal Detectors Is the Better of the Other
Metal detectors are common today at sporting events, outdoor events and gatherings, airports, night clubs, prisons, schools, production and distribution facilities. Developed in the 1960s at the beginning of the modern logistics age, portable metal detectors are a mainstay of employee security in many modern distribution centers. They are also used for security at checkpoints at airports, schools and courthouses, prisons and military installations. Today, you can no longer detect anything that has been stolen from a warehouse or a distribution centre. What follows is an overview of current security screening technologies, how they work and what kind of health problems they can cause. Anyone who has flown on an aircraft in the past ten years knows the use of handsticks for individual screenings, walking metal detectors, full-body scanners and luggage X-ray machines. One of the easiest and most cost-effective scanning devices is the hand-held detection stick. Hand-held detectors allow security personnel to find hidden metal objects that pose a security threat. High-quality safety metal detectors offer various alarm indicators, including optical LEDs, selectable acoustic alarms and vibrations. High-quality safety metal detectors are self-calibrated and make regular sensitivity adjustments superfluous. They are lightweight and equipped with a standard 9V battery that allows up to 80 hours of continuous operation. Handheld metal detectors are affordable and are often used in various facilities and checkpoints to improve security. Airport security uses large walk-in metal detectors to speed up security checks. Hand-held metal detectors, like most of them, use a similar electromagnetic field technology (EMF) to determine if you have metal on your body that cannot be used in an X-ray image. Nightclub staff have to scan guests as they enter the premises, and outdoor music events and sports stadiums use metal detectors to increase security. There are two main reasons why safety bars are used: to protect security personnel when searching for a person, and to protect and avoid a pat on the back. The use of a portable metal detector to scan the body allows security personnel to find contraband without putting anything sharp in their pockets. Individual screens, such as hand-held scanners and wands, can come in handy when your throughput and volume requirements are low. Safety bars warn you of a target with acoustic sound, target recognition light, vibration or a combination of these three. You can select the device that offers the most appropriate target response for your environment. Most importantly, the target of a weapon gives the member of the security team extra time to address the situation. Since hand-held detectors emit no radiation like X-ray machines they use an electromagnetic field (EMF) to detect metals. Security personnel will be able to hear acoustic sounds through an external speaker connected to a headset that goes through metal objects. Due to the large noise level in the vicinity, the security team member does not have to look at the metal detector, but only feel the vibration. A series of hijackings in 1972 led the United States to introduce metal detector technology to monitor passengers using magnetometers designed to log flight operations and detect spikes in trees. In 1995, systems such as Metor 200 emerged that were able to indicate the approximate height of metal objects on the ground, which allowed security personnel to pinpoint the source of the signal. A common development with other applications of metal detectors is that alternating current pulse systems use special coils and electronics that can be moved to improve the discrimination of the system.
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