Supplementary answer: because now the wire production enterprises, trickery, a roll of wire, in the drawing process on the tampering is to be the semifinished product of the wire - the last drawing process, most of the pull through, is fine to do a volume of wire Middle and final part, the last drawing did not pull through the short thick part in the injection molding machine package outer insulation layer, made into a bundle of cable finished product of the outermost part. Such a complex process to achieve the effect is to show you the beginning of the copper core is thick, while most of the inside winding is thin. So you have to measure both the diameter of the copper conductor in the opening part and the diameter of the copper conductor in the inside part of the coil up to see if it is consistent.
Analytical calculations, with secondary school mathematical knowledge will be able to, is the volume calculation, the unit length (such as a meter long) of the volume and weight relationship, the copper wire in the unit length of the volume, specific gravity of the relationship; in the unit length of the plastic insulation, shielding layer, sheath layer of the volume, the weight of the past cumulative calculations and the current batch of the sampling, cut off a section of the insulation layer, measure the weight of the unit length, generally just cut off a section of the insulation layer, measure the weight of the unit length, the weight of the unit length, the weight of the unit length. Length of the weight, generally intercepted 10 centimeters long, to calculate accurately, the length of the intercepted to have 1 meter better, but the waste is big.
This is too cumbersome, to create an equation, listed on a personal computer, let the computer solve the equation to calculate; or their own calculator on the operation.
Strongly recommend that you make your own instruments to measure, I can not prerequisite economic requirements gratuitous support for you to apply for a patent for your invention, and in this regard bear the legal responsibility, you do not pay can be given to pay can be, specific contact information in the background to provide. I two years, has answered more than 10,000 questions on Baidu know, not repeat the answer to more than 260,000 words, are my hand verbatim keyed in. This is a very old problem; before the emergence of the electron tube, is to use the Huishenden bridge to measure the resistance value of the wire, and now use a low resistance meter or four and a half digit voltmeter, measuring the DC resistance between the two ends, between the head and tail; after the emergence of the electron tube, it is the principle of radar, from one end of the hit a very short high-voltage pulse in the past, to measure the delay and phase of the return, as long as the cable is connected to one end of the measuring instrument can be. What armored cable, shielded cable, wrapped with iron grounding layer are the same to deal with, the Cultural Revolution to have the period of public official publication of the relevant books, even the line diagrams are completely open, and now measure the submarine fiber optic cable method is also similar to hit a laser in the past, the impedance mismatch, there are welded joints, there is a broken line, there are echoes, and now there are advanced semiconductor devices, the cable Fault testing instruments on the miniaturization, not only the telecommunications sector in use, do the network cable, network, server people are also using, at least the settlement of projects, accounting costs to use it, returnees are also imitating; of course, there are other extremely old and effective methods, not to be listed, it is recommended that the total quality of the copper to the nuclear reactor to detect. Put an end to those who can do it not being given it, and those who can't learn it in this life picking it up!
The former no position, but the latter monopoly of resources and power, is to jeopardize national security! The biggest obstacle is that those who can do it are not allowed to do it, and those who can't do it do great things, and the rights, instruments, and resources are all in the hands of mediocre people. It is not a question of treatment, but the lack of positions at all, not being able to enter the laboratory, not being able to use the idle common instruments. People have two sides. Overseas Chinese @# ￥ Office % ......& direct * units can have state-funded with computers and network access to many contract workers, enriching their spare time, but also with offices to contract workers. Meanwhile people who have obtained patents for their inventions and published many scientific papers in international academic conferences have not had workplaces and have been banned from using computers and instruments for decades. It depends on who, the target is different. It varies from person to person, depending on the circumstances. Does it? What are some of the black words, code words you know? A high-ranking hit man, on orders from his boss, drives a fancy car and says to his victim, "You can call 911!" "Do you believe I can beat you to death on the spot?" He was an electronics major, but he didn't even know what he was doing. He majored in electronics, but could not design single-stage circuits at all. He bought a multimeter for less than 100 yuan and had to ask for a large amount of money from merchants for rebates, and his thesis for the promotion of his title was plagiarized from a textbook and had to be inputted into the computer and printed for him by other teachers. The significance of the convening of the 17th National Congress for a harmonious campus In the military industry, the slogan is that neglecting quality is a crime. In the education industry, the monopolization of the classroom by teachers who do not have the ability to design and manufacture teaching equipment and industrial equipment and who can only transfer formulas from books is to jeopardize national security and undermine the foundation of the country! This class owns a high-class car and beats up people who have published papers many times in international conferences, and also states: you can call the police at 110, Director of the Overseas Chinese Affairs Office, do you agree? So, think broadly, be rooted, be able to industrialize, in order to stand up in front of the developed countries!
Take the Fluke test instrument as an example, to tens of thousands of yuan RMB one, the domestic one is only a few thousand yuan RMB one, the domestic accuracy is poor, normal people do not use. The principle of this test method is very old, the higher the precision, the length is about the shorter the more difficult to do, the higher the cost; you project it according to the speed of light, a microsecond launch pulse and receive the discriminating accuracy, the test accuracy is 300 meters, right (you go to the projections, here is just made up), the actual length of the round trip to be counted, the general need for the main frequency of the 1G of the launching accuracy and discriminating accuracy in order to achieve the accuracy of 0.3 meters; Shijiazhuang Semiconductor Research Institute is the manufacture of microwave semiconductor devices, this is not confidential, foreign countries know, you go to buy her production of the device will be able to transmit and receive; the pulse width of the emission should be very narrow, otherwise it is like a radar's blind spot, the minimum test length is on the large side. Other forest of test methods are not directly get test results, no direct reading and authority, not easily recognized. Gas company's vehicle gas leak detector to a set of several million yuan; gas companies, water companies, communications companies, municipal buildings, ground-penetrating radar hundreds of thousands of yuan a; infrared photographic equipment at least hundreds of thousands of yuan a; full of GPS can not be located in the high-speed running missiles, satellites, and other people are not yet exported; depth of space detection, high-energy physics detection instrument accuracy is more than 20 times the negative square These are analog instruments, all rely on imports, now college students, graduate students, teachers, on a triode of basic circuits, basically not a few people can design debugging to precision.
The foundation is so profoundly, and the loud diploma, extreme academic qualifications, appalling titles abound, and continue to emerge, countless young generations of youth, a variety of quality training extracurricular tutoring costs, the amazing amount of investment in the sky shook the earth, have become the foreign scientific and technological literature, foreign system software, foreign hardware platforms, the system of large-scale integration. The key to look at the attitude of your leadership, now the regular cable production enterprises, have cable length measurement, accumulation, coding equipment, look at the length of the imported inkjet head to play on the cable absolute value, compare the length of the volume of the cable head, tail length marking, you will be able to know the bundle of the absolute length of the cable; your leadership, if itself with the enterprise has a behind-the-scenes transactions, you are serious, you will have to lose their jobs! The solution, first of all, is to order from a qualified manufacturer, requiring the manufacturer to be equipped with the necessary production equipment, your procurement for the industry recognized measuring instruments acceptance; for the largest domestic gains will be a few thousand dollars in manufacturing costs and a few hundred dollars in manufacturing costs of homemade measuring instruments design information, components purchasing locations, debugging methods to the community gratuitous disclosure, as a way to improve the quality of all the people to enhance the national strength.
I do not have a laboratory, no basic equipment, laid off and unemployed, to provide design information to the domestic science and technology museums are completely open to innovative exhibits, your topic is very good, people can not pay attention to this is not high-tech, no level
The design and radar is very similar; SWAT, public security, special forces like to use a blinding bomb to make the opponent temporarily blind, here the amplifier can not appear blocking the phenomenon, because the amplitude of the emitted signal is very high. Phenomenon, because the amplitude of the transmitted signal is very large (nanosecond level pulse to drive the amplitude is still not easy it), the echo received is very weak, its amplifier design skills in the 50 years ago in the public; you watch China's launch of manned spaceflight video, the recording is often "× × × × tracking is normal", is a few kinds of domestically produced radar models. The instrument you need, commercially known as cable detector, cable probe, cable fault test instrument, the past American Fluke company to 40,000 yuan a, now the low configuration of 10,000 yuan just out of the beginning of a, if you go to the Internet to search for the keyword "American Ideal", you can see this brand can be 5000 yuan If you search the keyword "American Ideal" on the Internet, you can see that this brand can be about 5,000 yuan. As a business can only go to buy imported instruments, for students in the study, is the line, assembly diagrams, test waveforms completely open such instruments as teaching instruments, which can only be such as my own hands to homemade it, but the official and the director does not agree to do not approve the homemade, it is illegal, you have to go to jail, so you go to ask them to teach you to make it. 40 years ago, the country has a technological innovation loose-leaf Publications are often published, there are official book number, the price is just a few cents to a few cents, are industrial and mining enterprises can produce their own, and can be used in practice; now I have contacted publishers in the north and south of the Yangtze River, are strictly refused to publish the relevant content, and in particular, refused to publish the teaching video, there is a word of electronic documents on CD-ROM, so that the loss of money; and to publish translations, excerpts from the large books, you go to the bookstore! I am not educated.
I have used 1700 words to answer your question, and you haven't told me the detailed specifications of the cables you use.