NOYAFA's Indoor Outdoor Laser Distance Measurer

NOYAFA's Indoor Outdoor Laser Distance Measurer

2021-10-06
NOYAFA
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indoor outdoor laser distance measurer is famous for its high quality in the market and we, SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED is the most professional manufacturer of this product. Aware of the importance of quality and performance, we implement strict quality control and use qualified raw materials from international prestigious vendors. We take efforts to overcome some design deficiencies. We guarantee this product with the best quality. NOYAFA is a brand that is developed by us and the strong upholding of our principle - innovation has affected and benefited all areas of our brand building process. Every year, we have pushed new products to the worldwide markets and have achieved great results in the aspect of sales growth.Having engaged in the industry for years, we have established a stable relationship with various logistics companies. Best Cable Tester Supplier in China _ Noyafa provides customers with a low-cost, efficient and safe delivery service, helping customers reduce the cost and risk of transporting indoor outdoor laser distance measurer and other products.
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Fiber Optical Tester - How to Use the Best One for Your Needs
Fiber Optical Tester - How to Use the Best One for Your Needs
Small portable microscopes were once developed to test fiber optic cables. One of the best applications of such a device was the identification of trace fibres to determine the correct connection. This made it possible to find a specific fiber in a multifiber cable for proper connection and installation.Fiber optic is a fantastic medium for spreading light signals, but it needs to be amplified in contrast to copper cables. High-quality singlemode fibers have attenuation and a power loss of only 0.1 dB per kilometer. The signal power (measured in dB) is higher at the head of the network connection than at the end of the customer connection, and it is impossible to suffer light degradation over the length of the connection.When testing fiber optic cables for optical losses, the fiber tester must be connected to a test source that provides optical light on a standard launch cable calibrated to a 0 dB loss reference. For example, when the light source operates at a wavelength of 1310 nm, the optical power meter for testing should be set to 1310.A power meter at the other end of the circuit measures the test source for each fiber tested and quantifies the loss (dB) of each fiber during the test. For double-end loss tests, attach the cable to be tested to two reference cables connected to the source, one per meter. This allows you to measure the two connectors lost at one end for each power cable in the cable.If your electricity meter has an internal memory for data recording, make sure you know how to use it. Use your equipment in the office to test one of your reference tests (bridging cables in each direction) and use the end loss test to make sure it is good.Connect the optical source to Jumper 1, testing one end of the system fiber. Apply the adapter and insert the second jumper for the test, Jumper 2, which contains the same size fiber as the first, and an optical power meter. For the receiver, a separation cable is attached to the receiver socket to measure the performance of the meter.The power of the fiber optic cable or optical return loss is the light pulse that enters the end of the fiber optic core and the percentage of light reflecting back to the source. Optical fiber loss varies according to wavelength, so the optical power meter uses the same wavelength as the light source. The optical performance at the end of the fiber is the basis for the loss measurement, and the power source is presented to the receiver.Both singlemode and multimode fibers (VCSEL) are sensitive to optical return losses (ORL) expressed in decibels (dB). It affects the fiber and laser light source and reduces the data transmission speed.The OTDR test measures the backscattering of light to assess the quality of fiber optic cables. If the light at the other end is not visible, fractures or other problems may occur along the length of the fibre strand.The best way to test such impurities is to use a fiber optic or fiber optic microscope, a special microscope developed for inspection of fiber optics. Fiber optic communication systems operate in the electromagnetic spectrum in the infrared range which is invisible to the human eye.Fiber optic cables have become a more popular choice than Ethernet for network and telecommunications applications due to their high data transmission speeds over long distances. Fiber is the dominant medium for all types of mission-critical data center connections, backbone buildings, and remote campus networks. As the popularity of bandwidth-intensive applications increases, demand for fiber-optic installations and infrastructure is accelerating.Fibre optic cables play an essential role in the telecommunications industry. Testing fibre optic cables is considered one of the most confusing and misunderstood stages of installing a fibre optic system, but it is one of the last and most important procedures for installing a fibre optic network. For optimal savings in system performance, it is important to select a fiber optic cable that is matched to a spectroscopic analysis system.AFL Optical Fiber Identifier (OFIS) is a robust, easy-to-use test instrument that detects the presence of signals in optical fibers. The OFI is an important tool for field technicians to ensure live fibres are not separated and provides the ability to track the fiber from end to end.The optical time domain reflection (OTDR) is used as a fiber optic cable tester to test optical loss. The fiber optic cable is guided to one end through an OTDR to analyze the backscattering of light returning to the source using a high-power laser light that emits a predetermined pulse interval and is connected to the cable. This is the one-sided fiber test method used by fiber optic testers to analyze losses and pinpoint their location for installation, maintenance and troubleshooting.Fiber optic testing requires special tools and instruments to select the appropriate components and cables for the equipment to be tested. The most important test of insertion loss in an installed fiber optic cable system is carried out with a light source power meter (LSPM) and an optical loss tester (OLT), which is required by international standards to ensure that the cable is not lossless within the acceptance and installation budget.If it is a long installation cable with intermediate connections, you should verify each individual connection with an OTDR, as this is the only way to ensure which is the best. For this purpose, the loss testing method specified in OFSTP 1.4 is tested for losses in the installed cable system. Power Meter Optical Loss Test Set (OLT) Test Kit With the right equipment and adapter, the cable system you are testing (e.g.
Problems Needing Attention in Field Repair of Wires and Cables
Problems Needing Attention in Field Repair of Wires and Cables
In the process of cable laying on site, the phenomenon of scratch and damage on the surface of cable sheath is common, and only the sheath is damaged slightly. How to repair can ensure the quality, short repair time and ensure the quality has increasingly become a common concern of cable consumers. Moreover, the investment is small and easy to realize under the bad conditions on site. Therefore, the repair technology and quality of on-site sheath have increasingly become the concern of users. The on-site construction conditions of cables are generally poor, which may be located in the power plant under preliminary construction, the newly-built field railway under preliminary construction, on the bridge or in the cable tunnel. Because the repair of field cable sheath is carried out with plastic welding gun, and the heating of plastic welding gun requires 220V AC, it is in the emerging field project, Generally, there is a lack of power supply on site, or there may be power supply. Due to the randomness of the laying position of on-site cables, it is difficult to provide power supply. Therefore, to repair the cable sheath, on the one hand, the personnel are in place, on the other hand, the power supply is mainly provided. Only the above two basic preparations can be made, In order to realize the normal development and progress of cable sheath repair. In order to facilitate the smooth repair of cable sheath field, the construction unit shall be equipped with field small generators. At the same time, it is convenient for on-site repair. The quality of the plastic welding gun provided now should be excellent. The heating area of the nozzle should be large and the heating speed should be fast. Moreover, the damaged parts in the cable setting out process are random. This work is easy to carry out in general cities and plain areas, but in some mountainous areas, due to the influence of complex terrain, the cable repair work is actually very difficult. Therefore, in order to reduce the investment in corresponding aspects and quickly solve the problem, a key problem is that the number of personnel in the cable laying process must be sufficient, and formal cable laying equipment shall be used for formal setting out, so as to avoid and reduce the damage of sheath in the cable setting out process. The technology required for on-site cable repair is not very high. After the cable is damaged, the cable laying construction unit must repair the cable on the premise of confirming that there is no damage inside the cable, otherwise the cable sheath repair has little practical significance. The cable must be repaired in time, otherwise the entry of external moisture and moisture will affect the service life of the cable. In Meiyu weather in the south, after the cable end is laid, the cable end is not sealed in time, resulting in the water flowing into the cable trench entering the cable end for 10-20 meters. After stripping the insulation of the end, it is found that all the conductors have been blackened, resulting in the waste of the cable after laying. Therefore, the inspection of the cable after laying should be strengthened, Maintenance and storage shall be carried out to prevent the shortening and termination of cable life caused by various external factors on site before power on. Some tools and materials used for on-site repair of cables must be fully prepared. Plastic welding gun is necessary. High voltage insulating tape, waterproof tape, peeled leather of plastic insulation and sheath, and other sealing materials must also be prepared, because cable insulation and sheath materials are mainly divided into cross-linked polyethylene, polyethylene, polyvinyl chloride and other materials. Some materials are thermosetting materials, such as cross-linked polyethylene insulation, which cannot be melted and reused again. They can only be repaired with high-voltage insulating tape and repair tape series provided by 3M company in the United States. Some materials belong to thermoplastic materials, which can be melted and used again at high temperature, such as polyethylene, polyvinyl chloride and other materials. Some materials can be taken on site, and the corner sheath material stripped from the cable end can be cut into thin strips to repair the insulation and sheath of low-voltage cables, The repair quality can fully meet the requirements of the normal service performance of the cable. In addition, the treatment of sheath damage of medium voltage cable during on-site laying should not be too rough. One is that the cable must be handled with care during the laying process. In addition, after the external damage of the cable, the damage of its internal insulation is sometimes hard to say, The author once conducted a return test on the cables with multiple damaged outer sheath caused by careless construction in the field laying process, and found that partial discharge exceeded the standard and breakdown occurred in the damaged parts of the cables. Therefore, for medium voltage power cables with damaged outer sheath in the field laying process, it is best to cut off the intermediate joint or replace the cable again, Because there may be hidden dangers after repairing the damaged part of the cable. Facts have proved that the repair of insulation and sheath of low-voltage cables must be slightly damaged. The repair of insulation and sheath can only be carried out on the premise that the insulation and sheath are damaged and other structures of cables are intact. The requirements of medium and high-voltage cables may be more stringent. In order to reduce the number of intermediate joints of cables in cable transmission of some projects now, All cables are long-length single core cables. Due to the long laying distance of the line, responsible terrain, the number of construction personnel and the lack of professional cable laying equipment, the probability of cable sheath damage during the construction process is greatly increased. After the above problems occur in some construction, it is irresponsible to wrap a bag of ordinary tape casually. There is no knowledge of the internal damage of the cable damage point. Insulation breakdown or potential quality hazards are likely to occur during the on-site completion test and later operation of the cable.
Cable Tracker for TV and Internet Providers
Cable Tracker for TV and Internet Providers
The introduction of cable trackerCable tracker is a device that allows a cable to be cut off from the power source. It is mostly used in cases when the power line has been cut or disconnected.This technology has been around since 2005 but it was not until recently that it gained popularity due to reduced cost and its ease of use. Cable tracker is now widely used for various purposes such as electrical work, building maintenance, and even home security.Cable tracker allows you to stop power by disconnecting the line from the main circuit breaker without having to turn off all of your appliances which may incur an expensive bill if turned off incorrectly.Tips for cable trackerCable tracking tools are designed to help people find the best cable companies in their area. These tools provide a list of options that can be narrowed down with ease.If you've been living without cable for a long time and are ready to make the switch, one of these tools can help you find the best deals and package services that will suit your needs.Making the switch to cable is a big decision, and it's important to know what you're getting yourself into before committing.How to use cable tracker?Cable tracker is a small device that we use to measure the distance between two points and it is found in almost every room in our home.Today, there are a lot of new ways for us to enjoy watching TV in the comfort of our own homes. The cable tracker helps us find the best angle for watching TV and even lets us pause while we cook dinner.Cable tracking devices can help you with many tasks around your house like finding the right position for an antenna or measuring distance between two points. They are inexpensive and easy to use.The specifications of cable trackerCable tracker is a device used to measure the distance between a point and a cable laying on the ground. It consists of a rod, an "O" ring, and an attached meter.The cable tracker was developed by Alfred J. Butler in 1883 and patented in 1885. It was originally meant for measuring the distance between two points on a long piece of wire. However, it became popular after being adapted for use with cables.A favorite use for this device is to measure the height of trees by running it through each tree's trunk, taking care not to come in contact with the metal rods inside which could damage them or cause rusting that would eventually lead to breaking off branches.The product instructions of cable trackerThe product instructions of cable tracker is a website that helps customers to choose the perfect cable and subscription for their needs. In order to better assist customers, the company has decided to put in AI writing assistants.It is important for companies who are working with AI writing assistants to make sure that they are not taking away from human employees and instead enhancing their work. They can do this by collaborating with other departments.The main purpose of product instructions of cable tracker is to help people find the right cable subscription for them, which will help them save time and avoid potential mistakes.The application of cable trackerCable tracker is a technology that helps in the installation of underground cables. It is mainly used for making the installation easier and faster.The device consists of a sensor, an on-board computer, and an automatic control software. Cable tracker can be used in different types of environments with varying conditions such as drilling through hard rock or through water or mud.Cable tracker is useful for many industries, and it has been most widely used in telecoms construction. The first application was done by Telstra's Cabling Systems division in 1995 at a construction site near the Sydney Harbour Bridge in Australia.
Working Principle of Live Cable Identification Instrument
Working Principle of Live Cable Identification Instrument
As the running live cable is not allowed to damage any grounding wire and other connecting wires, nor is it allowed to directly add the output signal of the live cable identifier transmitter to the cable phase line with high voltage. Two difficult problems need to be solved for live cable identification. One is how to couple the cable identification signal to the cable; Second, the coupled signal is generally small, and the operating cable may have 50Hz power frequency electromagnetic interference composed of 50Hz unbalanced current, induced 50Hz interference current, cable distributed capacitance current, etc. the high-sensitivity receiving caliper has the problem of how to resist 50Hz power frequency interference. The charged cable identification instrument developed by US adopts single chip microcomputer coding and decoding technology and PSK technology widely used in the field of communication. The phase coded signal with an average value of 0 is transmitted on the transmitting caliper, and the single chip microcomputer in the receiving caliper performs phase identification after filtering the received signal by hardware and software. When the receiving caliper cards the cable according to the current direction, the identified cable ammeter deviates to the right, accompanied by audible and visual indication. The current direction of other cables is opposite to that of the identified cable, and the ammeter pointer deviates to the left. No audible and visual indication. This reflects the uniqueness of the identified target cable. It is easy to distinguish the identified cable from multiple cables. In addition, since the signal current strength on the identified cable is the same throughout the line, the electromagnetic signal strength received by the receiving caliper along the cable is the same. In principle, the identified cable is not limited by the length of the identified cable. Dear customers: Hello, our company is a high-quality development group with strong technical force, providing users with high-quality products, complete solutions and superior technical services. The main products are high voltage cable fault tester, cable fault tester, underground cable fault tester, etc. The enterprise adheres to the tenet of building a business in good faith, keeping the business with quality and developing the business with enterprising. It continues to climb new peaks with a firmer pace and make contributions to the national automation industry. New and old customers are welcome to buy their favorite products at ease. We will serve you wholeheartedly!
Configuration and Management of Cable Fault Tester
Configuration and Management of Cable Fault Tester
With the development of the times, the use of electricity has also developed. Now electricity is everywhere around us. Electricity is transmitted to various places through cables, which provides great convenience for our life and work. Subsequently, the production of cables is becoming more and more perfect, and the types of instruments used to detect cables - cable fault tester are becoming more and more abundant. Today, let's talk about the configuration and management of cable fault tester. With the production scale, type and sales volume of cable manufacturers increasing year by year. As the cable fault is divided into high resistance value, low resistance value, broken line fault and composite fault, the cable fault tester sold on the market is generally configured in sets of high and low voltage, including many components and accessories. A set of equipment components are as few as 5-6 pieces and as many as 10-11 pieces. As a cable manufacturer, it is necessary to timely locate and deal with various cable faults in the factory production process to ensure the timely delivery of products; At the same time, it is also necessary to consider the location of sudden cable faults after the cable laying at the customer's site or during operation. Therefore, as a cable manufacturer, when purchasing the cable fault tester, it mostly adopts the complete set of high and low voltage procurement configuration. In case of direct buried cable fault location at the customer's site, the handling and transportation of the complete set of equipment must be transported by a special cable fault detection vehicle to ensure the quality of transportation. At present, the cable fault testers sold on the market are mainly divided into two categories. One is the cable fault tester designed based on the principle of echo method: mainly including intelligent waveform detection analyzer, conductor instrument and DC high-voltage generator, including console and DC dual-purpose high-voltage test transformer, electric container, ball gap, pointing instrument, etc. The other is a cable fault tester designed and manufactured according to the principle of electric bridge method: the components mainly include fault locator, capacitor, ball gap, pointing instrument, etc. The above two instruments for detecting cable faults are both coarse side positioning part and accurate positioning part of cable faults. When used at the production site and customer service site, the cable fault tester often needs frequent transportation or long-distance transportation. In order to ensure the normal transportation and use of cable fault tester, the daily maintenance and management of cable fault tester is particularly important. At the same time, the actual use frequency of cable fault tester is not high. Therefore, the probability of equipment failure during transportation is not very high. Optical cable fault detector is a kind of precision and valuable equipment. In order to ensure the integrity of the actual use of the equipment, as a cable manufacturer who purchases and uses the cable fault tester, the actual use of the cable fault tester must be subject to daily maintenance and management, so as to give full play to its role at the critical moment of cable fault in production and customer site, Ensure timely delivery of products and rapid resolution of cable faults at customer site. The following suggestions are put forward for the daily maintenance and management of the cable fault tester: the user of the cable fault tester must receive professional training to ensure the safe use of the equipment and prevent damage and electric shock during the use of the equipment. Establish the equipment account for the use of cable fault tester, designate a special person for the use and management of cable fault tester, and have a proper fixed place for storage and management. Before using the cable fault tester every time, the quantity, integrity, user and service time of each component of the cable fault tester shall be strictly checked and recorded. File the equipment with a debit note. After the cable fault tester is returned to the factory or workshop for use, a secondary point inspection must be carried out. The number of points shall include the number of equipment and the number of all accessories. The integrity of the equipment shall be checked before acceptance. In case of equipment failure and missing accessories, it shall be handled in time, and the corresponding economic losses shall be investigated to ensure that the equipment is in good condition before use, And signed by the user and the manager for confirmation.
Introduction to Relevant Knowledge of Power Cable Pathfinder
Introduction to Relevant Knowledge of Power Cable Pathfinder
Electricity has an incomparable position in our daily life. It can be said that without electricity, our life will be a mess. However, the power demand is so large that the cable will inevitably fail. In order to remove the fault in time, relevant detection equipment is essential. Today, Xiaobian will introduce you some relevant knowledge about power cable Pathfinder. In the power industry, due to the outgoing fault of power cable, it is necessary to determine the fault location. At this time, in order to accurately find the fault location and reduce the excavation quantities and search time, it is necessary to use the intelligent cable path detector to quickly and accurately determine the cable path. There are many communication cables and TV cables in the communication industry. When these cables have faults and need to be detected, their paths also need to be determined. In order to avoid damaging underground pipelines during excavation, reduce unnecessary economic losses and speed up the project progress, it is necessary to accurately know the location of buried pipelines. Due to the incomplete or missing data of underground pipelines in the past, the urban construction and planning department can not accurately grasp the distribution of pipelines under the city, resulting in many problems in the process of urban planning. In this case, the path of underground pipelines should be detected again and saved. Because the cable is directly buried or buried in the cable trench, it is difficult to observe the cable path direction when the GIS data is incomplete. Therefore, after pre positioning the cable, the next step is to use the Pathfinder to find the cable direction and find out the approximate location of the fault point, and the precise point at the back is meaningful. At present, the commonly used cable path detection method is audio induction method, that is, add audio current signal of specific frequency into the cable, the current signal generates magnetic field signal around the cable, sense the magnetic field signal with an induction coil, convert it into sound or waveform after filtering, and display it through earphone or display, Where there is sound or waveform display is where the cable passes, so as to detect the cable path. When using audio induction method to detect cable path, if you want to get a strong magnetic field signal on the earth surface, you must make some current pass through the earth, otherwise the magnetic field signal may be weak. The power cable Pathfinder is a device for detecting the underground cable path. It not only has the function of the old underground cable path detector, but also has some new functions, and has made a certain technical breakthrough. 1. Peak mode. In this mode, the relative position between the cable and the operator can be judged and the direction in which the operator should move can be indicated, Then find the buried location of underground cables. 2. Valley value mode, which has compass function, can judge the deflection direction between the operator and the cable, and prompt the operator to correct his direction in time until the position of the cable is found. 3. The automatic search and locking frequency function can search the signal frequency when the frequency input is unknown, so as to determine the access frequency and lock it. 4. Current and depth display can display the current and buried depth of underground cables in real time. 5. GPS positioning: when the location of the cable has been determined and the current geographic location information of the cable needs to be recorded, you can select the GPS positioning function to record the geographic location information of the current cable, and finally upload it to the computer for cable data management.
Cable Fault Test Procedure
Cable Fault Test Procedure
When using cable fault tester (echo method) to test cable fault, the following procedures shall be followed: â‘´ multimeter, megger or judge the nature of cable fault from the cable pre-test results. (2) select the appropriate test method according to the nature of cable fault: the pulse method is best used for low resistance fault and open circuit fault. Of course, the flashover method can also be used for low resistance fault. Flashover method (impulse l method) is best used for leakage high resistance fault, and direct flashover method can also be used for some leakage high resistance faults, but this is usually not done. Direct flashover method is best used for flashover high resistance fault, or both methods can be used to measure and compare each other to improve the accuracy of judgment. (3) select the working grounding point, and lead out two grounding wires respectively from the selected grounding point, one to the ground of the instrument and the other to the ground of the high-voltage equipment. The selection principle of working ground wire is to ensure that the test phase and it form a closed loop, so that the instrument can obtain the correct test waveform. It should also be noted that the working ground wire must be connected with the system to make the human, instrument ground, high-voltage equipment ground and the tested cable ground in the same position. To ensure personal safety and integrity of instruments and equipment. If the cable is in phase to phase fault, the working ground wire must be one of the phase wires, and the phase wire as the ground wire must be connected with the system ground. For the cable with lead-free bushing, most of the faults are discharged to the earth or space during the high-voltage flashover test. Theoretically, the fault also forms a closed loop relatively to ground or space, but in fact, the equivalent impedance in the loop is quite large, so the correct test waveform can not be obtained on the instrument. In case of this situation during the test, the method of directly fixing the suspicious fault point can be adopted to solve it. No matter what ground wire, its grounding point must be reliable. (4) test the total length of the cable with the pulse method to calibrate the radio wave transmission speed of the tested cable. (5) rough test the fault point according to the selected test method. (6) fix the fault point after rough measurement.
How to Use Network Cable Tester_ Application Method of Network Cable Tester
How to Use Network Cable Tester_ Application Method of Network Cable Tester
Now cables are used in all aspects of people's production and life, so mastering the operation method of network cable tester is the most basic requirement for cable users. So how to use network cable tester?Application method of computer network cable tester1. Insert the two ends of the network cable above the main and auxiliary survey lines respectively, and you can insert any head at will;2. Then turn on the switch of the line measuring instrument;3. Observe whether the indicator lights of 1-8 on the main and auxiliary line measuring instruments are on, and the order of lights is correct.4. For example, 1 light on the main survey line instrument should be on, and 1 light on the auxiliary survey line instrument should also be on. If the 1 light on the main line measuring instrument is on and the 2 light on the auxiliary line measuring instrument is on, it indicates that there is a problem with the network cable and it can not be used normally;5. Among the eight lights, as long as the lights 1, 2, 3 and 6 are on, the network cable can be used, because the data is transmitted through these four lines, and the other four lines are not used to transmit data.There are two standards for the order of network cables:1: The standard of t568-b is orange white, orange, green white, blue, blue white, green, brown white and brown.2: The standard of t568-a is green white, green, orange white, blue, blue white, orange, brown white and brown.The first standard is generally used.Second, insert the crystal heads at both ends of the network cable into the RJ45 port of the main tester and the remote test end respectively, and turn the switch to "on" (s is slow gear). At this time, the indicator heads of the main tester and the remote test end should flash one by one.Test of direct connection: when testing the direct connection, the indicator lights of the main tester should flash one by one from 1 to 8, and the indicator lights of the remote test end should also flash one by one from 1 to 8. If this is the case, it means that the connectivity of the through line is OK, otherwise it has to be redone.Test of interleaved lines: when testing interleaved lines, the indicator lights of the main tester should also flash one by one from 1 to 8, while the indicator lights at the remote test end should flash one by one in the order of 3, 6, 1, 4, 5, 2, 7 and 8. If so, the connectivity of interleaved lines is OK, otherwise it will have to be redone.If the line sequence at both ends of the network cable is incorrect, the indicator lights of the main tester still flash one by one from 1 to 8, but the indicator lights of the remote test end will flash one by one according to the order of the line numbers connected with the main test end. In other words, the remote test end cannot flash in the order of the above steps.Phenomenon of wire open circuit testWhen one to six wires are open circuit, the indicator lights of the corresponding wire number of the main tester and the remote test end are not on, and other lights can still flash one by one.When 7 or 8 wires are open circuit, the indicator lights at the main tester and remote test end are not on.Phenomenon of wire short circuit testWhen two wires are short circuited, the indicator lights of the main tester will still flash one by one in the order from 1 to 8, while the indicator lights corresponding to the two short circuits at the remote test end will be lit at the same time, and other indicator lights will still flash one by one in the normal order.When three or more wires are short circuited, the indicator lights of the main tester still flash one by one from 1 to 8, while the indicator lights corresponding to all short circuits at the remote test end are not on.
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