Especially in the wire and cable transmission lines is essential in the power system, it also has several classification, special cables, insulated cables, etc., below the Yellow cable will give you the most comprehensive examination to share the cable good or bad way!

Wires and cables for transmitting electric (magnetic) energy, information and implementation of electromagnetic energy conversion wire products, wire and cable generalized also referred to as cable, narrow cable refers to cable insulation, which is defined as: a collection of the following components ; one or more insulated cores, as well as their respective cladding layer may have a total protective layer and the outer sheath, the cable may also have additional uninsulated conductors.

For transmitting electric (magnetic) energy, information, and achieve electromagnetic energy conversion wire products. Generalized also referred to as wire and cable cable, cable refers to narrow insulated cables. It can be defined as the aggregate consists of the following components: one or more insulated cores, as well as their respective cladding layer may have a total protective layer and the outer sheath, the cable may also have additional uninsulated conductors .

1, check the shield braid: Program number is enough? Copper netting, check solderability, tinned copper wire scrape computer to see which is not copper, aluminum-magnesium alloy hardness significantly greater than copper; netting sparse, uneven distribution, the insulating layer and so on are not tight wrap poor cable; burned with a lighter wire, copper clad aluminum if it is, it is easy to see inside and outside the copper color are not the same; peel skin, shield braiding angle to see if basically stand up, so basic It can be seen on a larger braid angle as jerry products;

2, PVC jacket: the pressing surface can be seen inside the netting regular "irregularities" described process, and will not produce sliding, good cable. The appearance of smooth, do not see the pressing netting of "irregularities", Yong Shounie jacket had loose movement, is the difference between the cable;

3, check the wire and the insulating layer stick together: oblique cut insulation, according to the release direction to pull the core wire, the core wire and the insulating layer to see there is no stick together Craft Materials; the cable has a larger stick together, poor cable is not stick together;

4, check the wire: Diameter --SYV cables 0.78-0.8mm, SYWV cables 1.0mm; SYV75-5 recently there has been a core diameter is 1.0mm cable characteristic impedance of this cable, certainly not 75 ohm, does not apply to 75-ohm transmission system; check the cable with a vernier caliper diameter of the inner core;

5, longitudinal tensile test: Take a cable Mian anti-hierarchical stripped wire, insulation, shielding layer, the outer door sets, each 10 cm long stay. The method is: two hands holding two adjacent cables, pull in the opposite direction; the cable pull force generally does not move, does not charge cable vigorously difference can easily pull out.

6, open the roll of wire to measure the length, or by weighing method probably judgment;

solution

If you purchased the failed cable, and there is a problem, here are some recommended solutions:

1, if the transmission distance is more than 800 meters, with SYV-75-5 cable and found no images or images in the beating, you can use the video zoom interference device, which uses video segments in an enlarged manner, the video signal can be enlarged up to 10 times so that it can effectively extend the transmission distance (not a simple amplifier, otherwise great loss of signal);

2, if a few cables interfere with each other, you can use the multi-signal Multiplexer, can simultaneously transmit 8-way video and control signals in a video cable;

3, if you encounter a problem of welding cable, it is recommended to buy pure tin wire, and high power soldering iron for fast, must not be slowly on the tin;

4. Finally, if the video cable is not assured, can also be used multiple RF transmission cable device video signals, an RF cable can transmit 20 channel video and control signals. Transmission range of up to three kilometers, so the cost will be more cost-effective.