Guide to Buy Electrical Tester in NOYAFA

Guide to Buy Electrical Tester in NOYAFA

2021-11-09
NOYAFA
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electrical tester excels other similar products in the industry with stable performance and different specifications. SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED keeps investing in research and development, greatly enhancing the technology value of the product. Its design proves to be unique following the latest market trend. The materials it adopts meet the high international standards, making the product have a long-term service life.There are new members joining in NOYAFA every year. As a product category, they are always combined to achieve a joint effect. They, as a whole, are displayed at the exhibitions every year and are purchased in large quantities. They have been certified and verified by authorities and are allowed to sell all over the world. Based on continued R&D and yearly updates, they will always be leaders in the market. We further deepen cooperation with customers by delivering high-quality products and guaranteeing complete services. electrical tester can be customized with regards to its size and design. Customers are welcome to contact us via e-mail.
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Best Cable Tester& Viewer
Best Cable Tester& Viewer
There are a lot of cable testers available in the market today. Many of them are developed by biased software developers. The reason is that there is no need for software developers to test other significant hardware components of a system. That's why all these software testers are biased towards specific manufacturers and applications.A wide range of tools exist, however, some are better than others, depending on the criteria you may be looking for like durability, testing speed etc. We will not discuss advantages and disadvantages as they do not apply to this article but instead focus on what you should look for when choosing one over another.As we have seen with most products mentioned in this article, there are plenty of options available online today and each one has its own strengths and weaknesses so it is important to know which one you shouldI wrote about the best cable testers above.The cable tester is an important aspect of electric circuits. The main function of the cable tester is to check whether a certain cable has a fault or not.This section will introduce you with what the Cable Tester is and how it works today.In the past, the cable tester performed due diligence on a certain set of cables. She found out whether they were compatible with various equipment and what kind of performance was expected. Nowadays, the task is passed over to robotsA cable tester is one of the most important people in the cable industry. They provide quick insight into the quality of the cables that they receive from various vendors.A cable tester is an expert on cables. He/she knows the ins and outs of the cables and can tell if they are performing as expected."Cable tester" is a popular test for TV and cable connections. It measures the quality of the cable connection. The "cable test" is necessary for determining whether a set will be able to transmit TV signals without interruption, or will have to do it on an intermittent basis.Being able to test a product on real-world applications is crucial for the success of business. It ensures that the product is safe to use.Instead of buying a new product, you can simply test it on your own. You can hide its flaw and then report it when you are done with this trial run.A cable tester is a person who tests cables, such as telephone cables or power cables. They are the most critical people in the industry.The best cable testers currently available for purchase are:What’s the purpose of a cable tester? To identify which cables are in use and to report this information back to the manufacturer.The advantage of using a cable tester is that it can be automated by a computer. Once set up, it can test any type of cables from different manufacturers at high speeds. This saves a lot of time and effort for the company’s IT department, particularly if they are trying to process many orders at once.There are a whole lot of cable testers out there, but they need to be evaluated and compared. This article will try to help you evaluate the software and makes it possible for you to make informed decisions when choosing the best cable tester.To help you decide on the best cable for your project, we have gathered these tests to compare different cable brands and make sure that the cable you choose is a good fit for your project and the system."Cable tester" is a fundamental tool for cable installation and maintenance. It helps the installer check if the cable is properly installed or not.There are many types of software that can test cables for different purposes. In this article, I will discuss the best cable testers that you should consider to test your cables for different purposes and the best one to use.A cable tester can evaluate cable and wire connections between different components.The best cable testers can give accurate results for a wide range of cables and wires. They are expensive, but the results are reliable. By purchasing a tester, you can also get the latest technology for your office or house.
What Are the Principles and Advantages of High Voltage Bridge Method
What Are the Principles and Advantages of High Voltage Bridge Method
What is a high voltage bridge? Designed based on the principle of Murray bridge, it is applicable to the location of breakdown points (low resistance, high resistance and flashover breakdown) of various wires and cables after laying and points without breakdown but with low insulation resistance: for example, the insulation defect points with low cable resistance but without breakdown under operating voltage are found with a megger. Of course, it can also be used to locate the defect points of various cables in the cable factory. There are two methods of cable fault location in rough measurement: electric bridge method and wave reflection method. At present, wave reflection locator is more popular. Its disadvantages are: the field wiring of some instruments is complex and there is a positioning blind area. When the waveform is not typical, the positioning personnel are required to master the instrument and be experienced to distinguish the pulse waveform. There are several cable faults that are difficult to find by wave reflection method: for example, insulation defect points of high-voltage cable sheath, steel tape armored low-pressure cable, PVC cable, no reflected wave, unable to locate. Short cable, unable to locate. Some high breakdown points cannot be broken down under impulse voltage and are difficult to locate. The high-voltage bridge cable fault tester contains a high-frequency, high-voltage and constant current source, which solves the interference problem of the power supply to the high-sensitivity amplification of the bridge. The power supply and the bridge are integrated. The measuring cable is a special high-voltage cable, which adopts the resistance measurement principle of four terminal method, with high positioning accuracy. The bridge is placed on the high voltage side and the operating button is safely grounded. The limitation of the bridge method for high resistance positioning is solved, and the characteristics of no blind area, accuracy and convenience of the bridge method can be brought into play. Murray principle in high voltage bridge: Murray in Chinese means Wheatstone, Wheatstone bridge (also known as single arm bridge). The universal Wheatstone bridge resistors R1, R2, R3 and R4 are called the four arms of the bridge. G is the galvanometer to check whether there is current in the branch where it is located. When G has no current, it is called that the bridge is balanced. When balancing, the resistance values of the four arms meet a simple relationship, which can be used to measure the resistance. When G has no current, it is said that the bridge reaches balance. When balancing, the resistance values of the four arms meet a simple relationship. Using this relationship, the resistance of Murray bridge can be measured. Advantages: 1. Murray bridge balancing method has no test blind area, which is used to judge the short cable and the breakdown point near the cable end. 2. Murray bridge method only requires the uniformity of cable phase resistance. Cables with poor traveling wave transmission characteristics, such as PVC low-voltage cables with large dielectric loss, can effectively judge the short cable and the breakdown point near the end by combining the current source with Murray bridge technology, so that steel tape armored low-pressure cables and PVC cables can have positioning and no blind area search.
Advantage Analysis of Cable Fault Tester
Advantage Analysis of Cable Fault Tester
With the development of the market, cable fault tester is mainly divided into common and three pulses. What are the advantages and functions of these two kinds? Yuange will explain them to you. [functional advantages of common cable fault tester] 1. It can measure high and low resistance faults of all cables below 35KV, with wide adaptability. 2. It has user-friendly software and full Chinese menu. Key definition is simple and clear. The measurement method is simple and fast. 3. Excellent fault detection success rate, test accuracy and test convenience. As the display terminal, the 4.8-inch color LCD touch screen has strong data processing ability and friendly display interface. 5. Sampling high voltage protection measures are provided. The test instrument will not crash and damage in the impact high-pressure environment. 6. With computer communication interface, it is convenient to save data and graphics in the computer. 7. No test blind area. 8. The built-in power supply can test the open circuit and low resistance short circuit faults of the cable in the environment without power supply. [functional advantages of triple pulse cable fault tester] 1. It can measure high and low resistance faults of all cables of 35kV and below, and has a wide range of adaptability. 2. The "three-stage pulse method" and "three-stage multiple pulse method" are adopted. At the same time, it also has the traditional high-voltage flashover method and low-voltage pulse method. 3. Any high resistance fault presents simple waveform characteristics similar to low voltage pulse short circuit fault, which is very easy to interpret. 4. It has user-friendly software and full Chinese menu. Key definition is simple and clear. The measurement method is simple and fast. 5. The central control unit is used for one key control to trigger three levels of signal output in sequence to ensure safety and success rate. The central control unit can prompt the operation steps and monitor the work process. 6. It has the function of test waveform storage, which can easily store the waveforms tested on site in the instrument according to the specified sequence for call and observation at any time. A large number of field test waveforms can be stored. 7. The measured fault point waveform and good phase full-length open circuit waveform can be displayed on the screen at the same time for the same screen comparison and superposition comparison, and the fault distance can be judged automatically. 8. 11 inch bright color touch LCD display, with strong data processing ability and friendly display interface. 9. Sampling high voltage protection measures are provided. 10. With 232 computer communication interface and USB communication interface, it is convenient to save data and graphics in the computer. 11. The built-in power supply can test the open circuit and low resistance short circuit faults of the cable in the environment without power supply. [functional advantages of cable fault locator] 1. The data display part adopts a highlighted 4.3-inch OLED color LCD to make the display interface clearer. 2. The function and parameter adjustment part adopts a one key programmable pulse coding keyboard, which makes the operation panel more concise and the operation more convenient. 3. The instrument will collect and display the waveform of the audio part in real time. The distance of the fault point can be roughly observed by observing the repetitive waveform characteristics and distance axis, and the operator is not easy to be tired. 4. There are single and continuous modes in the acoustic magnetic fixed-point mode. If the discharge frequency is too fast and the gap time is too short, the user can select the single mode to carefully analyze the relevant data such as the primary discharge waveform, and the waveform page turning is supported in the single mode. 5. In the acoustic signal acquisition, four filter bands are adopted, including low frequency band, intermediate frequency band, high frequency band and full frequency band, which can be selected by the user according to the actual situation on site. 6. The step voltage part adopts waveform display to continuously sample and refresh the signal, so that the user can enhance the continuity analysis of the signal and the resolution of the jump signal. 7. The step voltage part is subdivided into multiple gears, and the large signal is automatically attenuated during the adjustment process to ensure that the display signal is not limited when the maximum voltage amplitude within the test range is input. 8. FIR digital filtering technology is adopted for audio filtering, which makes the characteristic frequency band more obvious and the filtering performance better. 9. Display the distance of the fault point. The distance of the fault point can be displayed within 0-25m. 10. In continuous mode, the compressed waveform within 15m can be displayed. In single mode, the waveform within 15m can be analyzed.
Secret of Pipeline Detector Selection Method
Secret of Pipeline Detector Selection Method
Pipeline detector is a common pipeline detection equipment with stable performance and accurate detection. Depth and direction of gas pipeline, water pipeline, cable, etc. How to select a pipeline detector? Many netizens want to know. Today's Xiaobian will give you a brief introduction. If you are interested, you might as well refer to this article. The pipeline detector can quickly and accurately detect the position, direction and depth of underground water pipeline, gas 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. Pipeline detector 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 select the pipeline detector: 1. According to your own needs: many pipeline detectors are only suitable for some detection requirements. When selecting, you should understand the application scope of the pipeline detector. 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. According to the detection principle of pipeline detector, it can be divided into two categories: 1. One is to detect metal pipelines, electric / optical cables and some non-metallic pipelines with metal marker lines by using the principle of electromagnetic induction, which is referred to as pipeline detector for short. Advantages: fast detection speed, simple and intuitive, convenient operation and high accuracy. 2. The other is to use electromagnetic wave to detect underground pipelines of all materials, which can also be used to find underground buried objects, commonly known as radar, also known as pipeline radar. Advantages: it can detect pipelines of all materials. Any instrument is not perfect and needs to be used together to give full play to their perfection.
Experience and Depth Analysis of Cable Fault Locator
Experience and Depth Analysis of Cable Fault Locator
At present, the cable fault locator mainly adopts the method of acoustic measuring points for various main insulation faults of power cables with medium and high voltage and above voltage levels. Dgz-1827 cable fault locator has this function. Open circuit fault acoustic measurement method wiring diagram. For simple open circuit fault, if acoustic measurement method is adopted, wiring shall be carried out according to the following figure. For various short-circuit faults (so-called metallic grounding faults), it is difficult to judge the fixed point by acoustic measurement method. Audio method or other methods can be used. For sheath failure, the step voltage method is generally adopted for straight tunnel and the clamp current method is generally adopted for trench tunnel. For various faults of low-voltage cables (usually leakage and open circuit faults), acoustic measurement method, step-by-step method and audio method can be used. Fixed point method of fault point in special cases, discharge probe of fault point at the near end of fault cable. For the closed insulation fault, the suspicious part of the cable can be manually and mechanically moved, and the location of the fault point can be determined by monitoring whether the insulation resistance value of the fault phase changes. For the intermediate joint failure, compare the vibration sound waves of the faultless intermediate joint and the faulted intermediate joint to determine the intermediate joint failure (the vibration sound waves generated by the faultless intermediate joint are transmitted far away, there are no * big sound points, and the sound is relatively small). In recent years, due to the extensive use of various rubber and plastic cables, product quality and construction technology quality, it is difficult to locate cable faults. There are usually two cases of high ground wire loop resistance: 1. The copper shielding layer of the cable produced by the manufacturer is discontinuous and has a breakpoint. 2. When the cable construction unit makes the cable joint, the ground wire connection or lead contact at the cable joint is poor. From a technical point of view, improving the principle of fault fixed-point test will produce positive results. However, to fundamentally change the current situation of cable fault test technology, it is mainly an efficiency problem. We should start from two aspects of management and technology, and simply emphasize that on the one hand, it is not very objective.
Functions of Professional Cable Identifier
Functions of Professional Cable Identifier
In order to quickly and accurately identify a specific cable from a bundle of cables, special instruments are needed, such as professional cable identification instrument. It is a compact instrument with relatively simple operation. So, what other functions should the cable identifier have? This is what Xiaobian wants to discuss with you today. Cable identification instrument is a special instrument used to identify a specific cable from a bundle of cables. It is a compact instrument, which is installed in an aluminum alloy box and consists of a signal generator, a receiver with sensor and wiring. In order to identify the cable reliably and accurately, it is necessary to add a special signal to the identified cable, which should be received by a special receiver. Using this characteristic, the cable to be found can be identified. The generator feeds periodic unipolar voltage pulses into the cable to be identified, which needs to be grounded at the far end to ensure that a large enough current flows through the cable. The system shall be designed so that the return current does not return from the same cable. This can be achieved. The direction of the pulse current fed into the cable can be used as an obvious identification standard. The outgoing current only passes through this cable, and all other adjacent cables flow through the return current, but their polarity is opposite. In addition to the actual difference in current direction, the current amplitude is also an identification feature. The outgoing current only passes through one cable, while the return current can pass through several cables, which means that the outgoing current is greater than the return current flowing through other cables. The task of the receiver is to detect the direction and magnitude of the current flowing through the cable. In order to achieve this purpose, the current sensor is used as a sensor, which is equipped with an amplifier and connected in series in the circuit. The sensor clamps the measured cable. The magnetic field generated by the current flowing through the cable induces a voltage in the coil of the sensor. The polarity of the voltage is determined by the current direction and the direction of the sensor coil. In order to obtain the voltage polarity with obvious current direction, all cables in a bundle shall be tested in the same correct direction. The voltage induced in the sensor coil is displayed in the meter. If the sensor is connected in the above way, the pointer swing direction can display the current direction, that is, only the cable with current flowing out deviates to one side, and this is the cable to be found. All other cables only flow return current, the pointer deviates to the other side, or there is no pulsating current, and the pointer does not deflect. The amplifier regulator on the receiver can adjust the signal strength. What we need for professional cable identification instrument is, on the one hand, of course, to have good accuracy. If the accuracy is not enough, we will use it in vain. If it is not accurate, it will affect the later stage. In addition to accuracy, it is necessary to ensure the service life. When an ordinary voltage current ratio meter type grounding resistance meter (commonly known as grounding megger) is used to measure the grounding resistance, the grounding device passing through the tower shall separate the grounding down lead from the tower for measurement; Through the grounding device of non prestressed reinforced concrete pole, the measurement shall be carried out after the grounding down lead is separated from the lightning conductor from the top of the pole. In the initial state of the system, press the setting key of the DC resistance tester to enter the setting function state, set the material option to unknown, set the measurement mode to resistance, set the working mode to standard, set the measurement speed to standard, and press the return key to return to the initial state of the system.
Hybrid Circuit Fault Diagnosis Based on Current Test
Hybrid Circuit Fault Diagnosis Based on Current Test
Abstract: in the process of hybrid circuit fault diagnosis using wavelet neural network, the selection of test parameters is very important. A fault diagnosis method based on current test is studied. Through the static and dynamic current information of PSPICE analog circuit and the combination of wavelet neural network, this method proves the feasibility of this method in hybrid circuit fault diagnosis, and provides a new method to improve the fault diagnosis rate of hybrid circuit.Keywords: wavelet neural network; Hybrid circuit; Current test; fault diagnosis0 IntroductionWith the rapid development of electronic technology and the continuous improvement of manufacturing technology, the complexity of the circuit is increasing and the chip size is decreasing. More and more mixed signal circuits are integrated on the system level chip, not just digital circuits or analog circuits. Because of the different testing methods of two circuits, traditional testing can no longer meet the development needs. This brings hitherto unknown challenges to designers, users and maintainers of the instrument and equipment, and also makes the detection of mixed mode signal circuits more and more seriously. The hybrid circuit fault diagnosis based on current test proposed in this paper is proposed under this background.1. Theoretical knowledge of current testCurrent test is to detect and locate the circuit fault by measuring the power supply current and effectively extracting the circuit fault information. It includes static current test technology IDDQ and dynamic current test technology IDDT.When the circuit works normally, the quiescent current is very small, but the quiescent current of the defective circuit is very large. Therefore, when the quiescent current in the circuit is detected to be abnormal, it can be determined that the circuit has failed. This is also the principle of IDDQ test. However, some faults in CMOS circuits, such as open circuit fault, do not cause abnormal quiescent current. Therefore, it is necessary to introduce dynamic current test here. Based on this, this paper considers the combination of quiescent current and dynamic current test, rather than simple quiescent current test. IDDT is a short conduction current, that is, during the state transition of CMOS circuit, PMOS transistor and NMOS transistor are turned on at the same time, so that a conduction circuit is formed between power supply and ground, as shown in Figure 1. Since IDDT is the change of current in the process of dynamic conversion, the size of IDDQ does not affect its result. Therefore, it also avoids the influence of the increasing static leakage current of deep submicron circuits on the test. This paper studies the significance of the combination of the two in hybrid circuit fault diagnosis.2 wavelet neural network for hybrid circuit fault diagnosisWavelet neural network is a combination of wavelet analysis theory and artificial neural network ANN theory. At present, there are two ways to combine the two:(1) Loose combination. That is, wavelet analysis, as a preprocessing means of neural network, provides input eigenvectors for neural network.(2) Compact combination. Wavelet and neural network are fused directly, that is, wavelet function and scale function form neurons.This paper adopts the combination of loose wavelet and neural network. Firstly, the modeling and Simulation of normal circuit and fault circuit are carried out through PSpice, and the static current IDDQ and dynamic current IDDT parameters are extracted. The characteristics of the obtained current are extracted by wavelet analysis in MATLAB, and analyzed in combination with neural network. The steps are as follows:(1) Parameter extraction. The current information of normal circuit and various fault circuits with bridge fault, open circuit fault and so on are extracted in PSPICE.(2) Wavelet analysis. The current information obtained in (1) is decomposed by wavelet in MATLAB, the wavelet coefficients are extracted, and the RMS is further calculated.(3) Fault location. Wavelet analysis and BP neural network are combined to analyze and judge the positioning effect. The specific steps are shown in Figure 2.
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