Multifunctional electric cable failure detector

Abstract

The present invention discloses a multifunctional cable-fault detector which is characteristic of comprising of field programmable gate-array chip, field programmable gate-array allocated storage chip, serial communication interface circuit, emitting driving circuit, multi-point relay circuit, signal conditioning shaping circuit, high-speed comparator circuit, A / D conversion circuit, numerical control precision potentiometer, LCD display circuit, LED pilot lamp circuit and key-press circuit. The present invention can detect length of twisted-pair, super-long of twisted-pair, connectivity of twisted-pair (including fault such as open circuit, short circuit, inversed joint, error meeting, super-long and so on), fault class (including open circuit and short circuit), fault point location orientation and multiple parameters such as return loss, can obtain technique parameters of twisted-pair and realize detection and orientation of fault point location, has merits of high precision, credible capability and portable capability.

Description

technical field [0001] The invention relates to a multifunctional cable fault tester, which belongs to the technical field of cable test equipment. Background technique [0002] With the rapid development of information networking, the network has entered every aspect of life and has become one of the indispensable elements for people. my country's Internet is developing rapidly. As of December 31, 2007, the total number of Internet users in my country has reached 210 million, ranking second in the world after the United States with a difference of 5 million. However, with the rapid development of the network, network failures caused by transmission cable failures also occur frequently. According to statistics, about 50%-70% of network failures are related to cables, causing huge economic losses. It can be seen that the quality of the cable itself and the installation quality All directly affect the normal operation of the network. Therefore, it is of great practical signi...

AI Technical Summary

Problems solved by technology

In addition, the pulse width of the transmitted pulse also has a great influence on the test accuracy. The larger the pulse width is, the easier it is for the transmitted pulse and the reflected pulse to alias during short-distance measurement, resulting in a test blind area and a smaller test resolution.

Conversely, the smaller the pulse width of the signal, although it can effectively improve the test accuracy, but its high-frequency component is higher, the energy of the signal is relatively smaller, and the loss and attenuation of the signal when it is transmitted in the cable is also greater, resulting in a longer test distance. short

In practical applications, it is difficult for general processors or digital integrated chips to generate high-frequency pulses that meet the test requirements, and it is also difficult to achieve such a high response speed. As a result, the test accuracy is not high and the blind area is large.

[0005] At present, most of the network cable testers on the market are products of foreign manufacturers (such as Fluke and Agilent in the United States; EDG in the United Kingdom, etc.), and their products have relatively mature technology, complete functions, reliable performance, high test accuracy, small size and easy to carry. and other advantages, but most of them are high-end and high-end products with high prices (usually between 20,000 and 200,000 yuan) and high instrument maintenance costs; although there are many network testers produced by domestic manufacturers, their types are single , most of the products are low-end products, although the price is low, but the function is single (mostly limited to cable connectivity detection), the accuracy is worse than foreign products, and the volume is too large to carry and use

These unfavorable factors have brought a lot of inconvenience to our country's network integrated wiring, and are not conducive to the construction and maintenance of our country's residential and urban networks. Therefore, it is necessary to develop a new multi-functional cable tester to meet the needs of practical applications.

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