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How to buy video monitoring cables? Matters needing attention for video monitoring cable!
Video monitoring cables are the video transmission medium used in the safety protection system. There are many kinds and materials. The quality of the cables has a great impact on the quality of video monitoring. Here are some notes to check your selected video monitoring cables for your reference.
Video signal transmission generally adopts direct modulation technology in the form of baseband frequency (about 8MHz bandwidth), and the commonly used transmission medium is coaxial cable. Coaxial cable is specially designed to transmit video signal. Its frequency loss, image distortion and image attenuation are relatively small, which can complete the task of transmitting video signal well. Generally, the special SYV75 ohm series coaxial cable is adopted, and the commonly used type is syv75-5 (it usually has a transmission distance of 300-500m for video signal). When the distance is far, coaxial cables of syv75-7, syv75-9 and even syv75-12 should be adopted (in actual engineering, the non-relaying transmission distance of thick cables can reach more than 1km);
I. enterprise qualification and product quality inspection certificate
When users or engineers choose security cables, they should first pay attention to the enterprise and product qualification materials, and need to know the following qualification certificates of the production enterprise: Business license, organization code certificate, tax registration certificate and so on all can show that the production scale of enterprise power and the enterprise level, the national industrial products production license (cable), CCC China compulsory product certification, the ministry of information industry examined, such as ISO9001 certification certificate are the necessary production enterprise production and business operation license qualifications and a sign of enterprise quality management level, the period of validity of the authority of the department of quality inspection reports, certificates or other documents, such as industry membership certificate, honorary certificate, certificate, patent certificate, etc. Is the production enterprise in the industry of user awareness, influence and overall strength of strong evidence.
2. Cost performance and service
When users purchase security wire and cable products, after understanding and carefully reviewing related qualification documents of the manufacturing enterprise, they will then comprehensively measure the product performance and price, as well as the service and supply guarantee capacity.
As an engineer or direct user, it is necessary to realize the efficiency and value of use at a reasonable price when the product quality is not much different. At present security system engineering needs a variety of specifications of the cable, the industry's mainstream security cable enterprises are generally able to guarantee. Therefore, some users unilaterally advocate foreign brands, and the consumption concept of high-priced cable products is irrational. Similarly, it is not desirable to blindly pursue low prices while ignoring product quality. It should be fully recognized that according to the law of market economy, reasonable price means reasonable quality assurance.
Iii. Field visit of manufacturers
When users choose cable products, it is also important to inspect the scale of the manufacturer and the production base. As an old saying goes, "seeing is believing". The particularity of cable products determines the specialty of cable detection means. Generally, users are accustomed to judging the quality of cable from its appearance and feel, but its real technical performance and parameters can only be achieved by relying on professional cable detection equipment.
The quality of cable products is mainly determined by the following aspects: raw material procurement; Production and testing equipment; Process and process control. The user can understand the guarantee degree of cable quality from the above points in the field inspection of the production enterprise.
The user can identify the products from the following aspects to determine whether the products conform to the standards. Considering that it is not possible for users to have professional testing equipment, several simple and effective methods are especially introduced:
1. At present, the main materials of safety cables are copper and PVC. The quality of the material can be identified with the naked eye.
1) whether the copper conductor is twisted in a considerable proportion of irregular manufacturers is omitted in this important process. If the copper conductor is not twisted, the conductor structure will be unstable. When the cable is bent, the construction will easily cause the insulation cracking or the conductor piercing through the insulation layer.
4) the outer sheath is tightly wrapped on the internal structure, and the gap should not be too large. The outer sheath and the internal structure have polyester wrap to effectively prevent the adhesion between each other.
Withstand voltage test - withstand voltage test bench
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