Shop Best Optical Power Measurement in NOYAFA

The medical and pharmaceutical chamber of Commerce of the all China Federation of industry and Commerce established the medical device Professional Committee yesterday and issued the 2012 analysis statement of the medical device industry. The statement shows that the dependence of some domestic high-end medical equipment markets on imports has decreased slowly last year. According to the deployment of deepening medical reform and the spirit of the 2012 national health work conference, the statement implies that China's medical device industry achieved a total sales revenue of 68.7 billion yuan in the first half of 2012, a year-on-year increase of 20.27%, The overall requirements of this year's work are: closely focus on the central task of deepening medical reform. It is predicted that China's medical devices will maintain rapid growth in the next 5-10 years, and the industry as a whole will maintain a growth rate of more than 20%. Among them, the focus is on food safety, occupational disease prevention and drinking water safety. According to the statistics of the statement, at present, although the number of medical device enterprises across the country has reached more than 14000, the competition pattern of the medical device industry is relatively scattered. In 2012, the food safety and health supervision of the health system should pay close attention to the following aspects: first, do a good job in food safety, More than 80% of them are small and medium-sized enterprises. The scale of enterprises is small, and there are problems such as insufficient R & D investment and weak technical ability. Because of fierce competition and low profitability, enterprises can only produce medium and low-end products or provide spare parts for foreign enterprises. " The head of the association hinted.

After 2 years without any exhibition, Noyafa attended the 14th CCEE YuGUO CROSS-BORDER E-COMMERCE EXHIBITION. During 2 days in the exhibition, we get around 400 customers coming to visit us and 85 of them have asked for samples including our cable testers, cable trackers, underground cable locators, cable length testers, Thermal Imagers, Air condition testers etc. For all the customers we offer our best service and our latest catalog, with full range of products, Noyafa gets many new customers from the exhibition. Founded in 2006 Noyafa specialized in testing instruments and cable testers for 15 years with rich ODM/OEM experience for many famous brands around the whole world. With 28 professional engineers Noyafa brings at least 15 new products to the market with 128 patents, Self owned industrial park with more than 200 experienced employees empowered the strongest capacity for production. 10 production lines set up in our production base, with 12 international sales, 10 domestic sales, 5 after sales assistants, Noyafa built a whole service team offering service for customers from 60 countries , 102 industry. Any inquiries you are always welcome to seek help from us.

Pipeline detector is one of the important equipment for underground pipeline survey. It can accurately and quickly detect the direction and location of various underground facilities under the condition of ensuring the integrity of ground covering soil. What we want to know today is the purchase method of the detector and some problems that may be encountered in the fault detection of the pipeline detector. You can study it carefully. The pipeline detector can quickly and accurately detect the position, direction and depth of underground water pipeline, metal pipeline and cable, as well as the position and size of the damage point of the anti-corrosion coating of steel pipeline without damaging the ground covering soil. It is one of the necessary instruments for water supply companies, gas companies, railway communications, municipal construction, industrial and mining, capital construction units to transform, maintain and survey underground pipelines. How to choose a pipeline detector? Here, I share my views with you, hoping to be helpful to you. 1. According to your own needs: many pipeline instruments are only suitable for some detection requirements. When selecting, you should understand the application scope of pipeline instruments. 2. Understand the test method of the pipeline instrument, whether the operation is simpler and the interface is more intuitive. 3. Understand the function of the pipeline instrument and whether the sounding capacity meets your needs. 4. Whether the configuration of accessories is complete, such as clamp (generally used for cable detection in dense areas), rechargeable battery (saving detection cost), etc. 5. The sustainable development of the instrument and the ever-changing technology are also a test standard of the instrument. 6. The compatibility of the instrument, whether the reception and transmission frequencies are wide, which is conducive to detection and expansion of use. In urban construction, urban underground pipeline data is very important. Pipeline detector manufacturers understand that many underground pipelines are troubled by aging and drawing changes during construction. At present, the detection work has been carried out in an all-round way. With the help of pipeline detector, supervise the whole process of project quality, project progress, operation safety and achievement archiving of underground pipeline detection. After the general survey, the results table will be prepared, the data function of the pipeline detector will be used, and the database and underground pipeline information management system will be established. It is a common situation for us to carry out detection in the completed area, which is a common problem in the fault detection of pipeline detector. For example, the general urban exploration work will encounter the interference of many urban buildings. At this time, it is necessary to rely on the sensing function of the pipeline detector for underground exploration. In the completed area, the operation procedure of the pipeline detector is: first, use the geophysical method to detect the category pipe diameter of each pipeline or the items of the inner bottom, upper pipe and outer top of the cross-section pipe (ditch) on the spot, and mark each characteristic point on the spot, then use the total station or RTK to measure the three-dimensional coordinates of each characteristic point, and then use the mapping software to draw the collected data on the topographic map for editing.

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.

The introduction of cable trackerThe introduction of cable tracker is a service that allows you to find the most popular channels in your area on the internet. The technology behind it is based on an algorithm that looks at over 65,000 HD channels and analyzes all of them to find out which are the ones that have a large audience.Tips for cable trackerOne of the most important aspects of a cable tracker is to deliver targeted information to one or multiple clients. This involves the use of various keywords. These can be broken down into different kinds:How to use cable tracker?It is a tool for creating cable-ready content. This article will help you get started with it.The specifications of cable trackerOne of the main features of a cable tracker is that it's able to identify and track TV channels on a channel-by-channel basis.The product instructions of cable trackerCompanies that sell cable trackers have to provide product instructions for the products so that a user can easily find the right product in their store. This section is about how to write effective product instructions and make it easy for a buyer to use the cable tracker.The application of cable trackerThere is a lot of buzz surrounding the use of the cable tracker. It can be used for everything from finding out what cable company is providing a better service to identifying products that have low quality.

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

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?.

Dry plug cleaners (also known as click cartridges) can be cleaned by slight contamination. However, connectors can be charged during drying, and this method can attract additional impurities.Laboratory tests have shown the attraction of metal powders to optical connectors that are electrically charged after being wiped with the dry tissue of a typical fiberglass cleaner cassette style (Berdinskikh, Fisenko, Daniel, Bragg & Phillips, 2003 ). Dry wiping creates a static charge which can attract contaminants onto the plug after cleaning (IEC TR 62627-01, 2010, p. Similar contamination can also occur in the practice of front surfaces on non-cleaned surfaces that are cleaned during the dry cleaning process.The static charge of dry cleaning can be reduced by exposing cleaned connectors and the end face during the cleaning process to deionized air for 5-10 seconds. Dry cleaning, however, hardens the contamination and requires additional pressure from the operator, which can lead to surface scratches that can cause permanent damage to the end face.The only way you can guarantee that your connectors will do their job is to thoroughly inspect and clean them. Once the fiber optic connectors are cleaned, it is best to reconnect them and cover them with a cap to ensure that they are not dirty.Owners of fiber networks should explore their options for cleaning fiber connections and choose the method that best suits their business. It is essential to inspect and, if necessary, clean the fiber optic connections before mating.Choose from cleaners for many types of appliances such as SC, ST, FC, LC, and Mu (clinking cloths) designed for multiple applications. This one-put-cleaner is designed to clean male connectors, female bulkheads, adapters, fiber optic patches, cables and testing equipment. It also cleans the end faces of the ferrule to remove dust, oil and other impurities from scratches on the end faces.The F offers several types of slide-in cleaners including a push-in cleaner for LC and Mu (1.25 mm ferrule), a push-in cleaner for SC, ST, FC and LSH (2.5 mm ferrule) and a push-in cleaner for MTP and MPO connectors.The easiest way to clean your test port is to use Quick Clean (tm) Cleaner. A handheld connector removes dirt, dust, oil, grease and dirt from the front of the connector.The CKF Fiber Optic Cleaning Kit includes our TravelSafe Fiber Connector Cleaner (FCS3), Plug Cleaning Pen (MCC25), Lint-Free Wipe (LFW90) and Hand Connector Cleaner (FCC 7020) and Replacement Roll (FCC 7021). Many products use the procedures shown in the Fiber Cleaning Techniques tab. The following hints are helpful to pay attention when cleaning connectors.IPA alcohol can be used to clean fiber optic connectors, but is not the best solution to clean them. An optical cleaning fluid to clean the fiber optic connection is the better choice. It will help to clean the connectors without the risk of damage.Calculating a force of 2.2lbs per 200mm will bring you to 45,000 psi, so contaminated migration in dusty environments should not be a problem. You do not have to worry about dust residues contaminating migration, as there is no physical contact with the plug and it is cleaned during the mating process. The best way to avoid the risk of contaminated migration is to clean the uncovered plug and cable assembly with a wipe and then glue the cleaner to the plug that is in the adapter.Several fibers are installed in its own sheath to separate from the buffer tube, and these fibers are surrounded by a common sheath. Scattering light causes a change in the refractive index of the fiber used, and the Bragg grid distributes the Bragg reflector. Coherent fibers are bundles of fibres arranged in the same way at the end of the transmitted images and are used to protect the fiber optic cable from physical damage by mechanical insulation. See macro bends for a small radius around the fiber optic cable so that it can be bent without excessive attenuation or breakage. This type of fiber optic connector consists of two tapered, ferrule-shaped receptacles that work in both directions.Please contact me if you need additional photos or information about this high-end upgrade. Silver Bird Bangle Bracelet sterling silver square hammer bangle with cute market of things that do not fit into your handbag, spare shoes or your tablet. Archive quality dry ink, inch cut surface, stainless steel cheese tool with rubber wood handle including fork tip, cheese knife, VFL visual troubleshooting, 20MW fiber optic cable tester, 650nm CatV, custom longboard, croozerboard, etc.Contamination of the fibre-optic end surfaces remains the main cause of problems with the fibre-optic network. Look at your face and follow the golden rule of inspecting, cleaning and re-inspecting. After cleaning, do not forget to inspect the front face. It only takes one second for a network to have Fi-7000 FiberInspector Pro certified front face according to IEC 61300 3: 35 standard.A digital microscope is a normal hand-held microscope to which a camera is added. The usual magnification range is 100x to 800x, but the most popular magnifications are 400x and 200x for this task. The latter is a better choice because you can see more of the area being inspected.

The function of cable fault locator is in the power industry and some industries using cables, especially in some complex power systems. It is very difficult to find the fault of underground cable lines. However, in this regard, the continuous emergence of equipment with various functions and simple operation can not only reduce the high cost of fault detection, but also reduce the inevitable long-time power failure when difficult to find (cable fault locator) cable fault, which brings a lot of convenience to troubleshooting. Direct buried cable fault detection in underground direct buried cable and underground residential power distribution (URD) system is a very time-consuming thing, and will cause very inconvenient power failure to users. Some technologies may also damage the cable. For some equipment with high technical requirements, its operation is more complex, and only operators with strict training can use it, which brings a lot of inconvenience to the popularization and application of this kind of technical equipment. Therefore, the selection of appropriate technology depends partly on the knowledge of cable system design understood by the designer of fault detector, and also partly on the professional and technical knowledge of equipment and operators in this regard. With appropriate equipment and professional technology working on site, it is the first step to detect faults quickly and effectively. Hammering (pulse) method many power companies use hammering (pulse) method. This technique is effective in detecting high resistance faults in a simple (cable fault locator) cable system. The hammering method includes using a pulse or impulse voltage to impact the power cut cable. When an effective high voltage pulse strikes the fault area, the fault point flashover and produces a hammering sound that can be heard by the operator along the cable surface. However, detecting cable faults often requires several hammers, and repeated shocks may damage the cable. Dear customers: the company also has underground cable fault tester, cable fault tester, mining cable fault tester and other products. You can call the company's service phone through the web page to learn more product details. Perfect and beautiful service is our pursuit. New and old customers are welcome to buy their favorite products at ease. We will serve you wholeheartedly!

What is a high voltage test transformerHigh voltage tester refers to a kind of transformer that generates high voltage for high voltage test. High voltage test transformer has the characteristics of high voltage, small capacity, short continuous working time, thick insulation layer and usually one end of high voltage winding is grounded.High voltage test transformer is called test transformer for short. The test transformer is generally a step-up transformer. The test transformer uses the power frequency high voltage induced by the secondary side to test the insulation performance of various electrical products and insulating materials. Test transformer is an indispensable electrical equipment for withstand voltage test in the repair of motor, transformer and electrical products. The test transformer is mainly used for power frequency withstand voltage test of electrical products, partial discharge measurement, thermal stability test of insulating medium, etc; For medium and high frequency electrical equipment, special frequency test transformers can also be used for withstand voltage test and measurement of relevant electrical parameters.The primary and secondary windings of the test transformer have a large voltage ratio. The primary voltage is 0.4kV, 3KV, 6kV and 10kV. The secondary voltage can be made into 100 2000kv or higher, and the capacity can be 3 9000kva. For the field test of power equipment, the light test transformer is generally used; 50kV step-up test transformer is used for withstand voltage test of 6kV, 10kV transformers and other power equipment; For the withstand voltage test of high voltage, ultra-high voltage transformers and other power equipment with voltage level above 35kV, ultra-high voltage test transformers greater than 5 times the primary rated voltage of the tested equipment, such as step-up test transformers of 500kV, 700kv, 800kV and certain capacity level.Characteristics of high voltage test transformer1) High voltage: the primary voltage of the test transformer is 220V or 380V, but the secondary voltage of a single test transformer often reaches thousands to tens of thousands of volts. The test transformer with secondary voltage exceeding 750kV usually adopts multiple cascade structures.2) Small current: the rated current of the test transformer is actually the capacitive current of the tested object, so it is generally less than 1a. However, the secondary current of the test transformer used for cable and large motor test, external insulation pollution test, line corona test and other projects can reach several amps.3) Short working time: due to the short withstand voltage time of the tested product, the test transformer is generally 0.5h or 1H short-time working system except for external insulation pollution test, line corona test and cable test.4) The test transformers are generally single-phase and indoor devices (some are also made into outdoor devices): they are oil immersed self cooling structure, the winding insulation layer is thick, and one end of the high-voltage winding is usually grounded.5) The insulation level of the head and end of the secondary winding of the test transformer is different: the head end is high potential, and the end is directly grounded or grounded through an ammeter.6) High requirements for design and manufacturing process: due to the high working voltage, the insulation structure has a decisive impact on the overall size of the test transformer. Vacuum drying is generally required for the body, and vacuum oil injection is required for above 100kV.Classification of high voltage test transformers1) In terms of structure, there are iron shell type and insulated shell type test transformers.2) In terms of power frequency, there are several frequency level test transformers such as power frequency, frequency doubling, intermediate frequency and high frequency.3) According to the voltage level, it can be divided into low voltage, high voltage and ultra-high voltage test transformers.4) According to the use form, it can be divided into light mobile type and fixed type; There are also single use and two or more cascade use test transformers.The test transformer is generally single-phase and indoor devices, which are oil immersed self cooling structure. Because of its high working voltage, its winding insulation layer is thick, and one end of the high-voltage winding is grounded.The specific structural types of the test transformer generally include single bushing type, double bushing type and insulating cylinder type.Technical requirements for high voltage test transformer①Output voltage waveform. The output voltage waveform of the test transformer shall be close to the sine wave as far as possible. In order to reduce the voltage waveform distortion caused by the harmonic voltage generated by the harmonic component of no-load current passing through the impedance of voltage regulator and transformer, the magnetic flux density should be selected in the straight line section of core magnetization curve; At the same time, voltage regulating equipment with small waveform distortion shall be selected, and filter device can be added if necessary.② Impedance voltage. The secondary current of the test transformer is generally capacitive current. When the secondary current flows through the impedance of the voltage regulator and the test transformer, the output voltage will exceed the value determined by the voltage ratio. Therefore, the impedance voltage of the test transformer should not be too large, otherwise it may affect the accuracy of the test results and reduce the short-circuit capacity of the test equipment. However, if the impedance voltage is too small, the short-circuit current may increase when the test object breaks down or flashover. The impedance voltage of a single test transformer is generally 4.5 10%, and when multiple series transformers are formed, it can reach 30 40%.What are the high voltage test transformers1） DJ oil immersed high voltage test transformerOil immersed test transformer: large volume, heavy weight, large capacity, convenient maintenance and high maintenance cost in the later stage; Mainstream products.The oil immersed type is filled with 25# transformer oil, and the insulation cooling effect is the best2） GTB dry type high voltage test transformerDry type test transformer: maintenance free, light weight, small volume, inverted and high cost.3） Inflatable high voltage test transformerInflatable test transformer: it needs later maintenance, with good arc extinguishing performance, light weight and danger.The oil immersed type is filled with 25# transformer oil, and the insulation cooling effect is the best; Dry type has small volume and lightest weight, but the voltage is difficult to be high; The inflatable type is filled with SF6 gas.Application and operation method of AC / DC high voltage test transformerDuring the step-up or withstand voltage test of AC / DC high-voltage test transformer, if the following unusual conditions are found, the voltage shall be reduced immediately and the power supply shall be cut off. As of the experiment, the reasons have been found out: ①the pointer of the voltmeter swings greatly; ② The insulation of the invention burns or smokes; ③ There is unusual sound in the test object.Utilization and operation methods of AC / DC high voltage experimental transformer:1. Connect the power supply of the control box (console) and turn on the indicator light.2. Press the start button and the operation indicator light is on (otherwise, the voltage regulator is not in the zero position, please rotate the hand wheel of the voltage regulator to the zero position counterclockwise) indicating that the experimental operation can be stopped.3. Move the hand wheel of the voltage regulator clockwise to make the conditioning rate 2KV / s better, and watch the high-voltage meter rise to the required voltage value. For example, in the process of boosting, when the test object breaks down, short circuit and overcurrent occurs, the overcurrent relay acts to automatically cut off the power supply.4. If the experiment requests overcurrent control, adjust the overcurrent relay to the power supply current value required by the experiment in advance before operation, and the current relay will stop overcurrent protection according to the experiment request.5. While monitoring the high-voltage meter, an external 0.5-level voltmeter can be accepted at the instrument end for monitoring.6. Measure the insulation resistance and check the insulation condition before and after the withstand voltage test.