1:Professional chassis
Ordinary computers and chassis materials themselves do not produce high-energy radiation, only computers working in the space environment have this external defense requirements, and in the aerospace structure, the use of lead as a protective material, the weight of which is difficult to bear.
We usually discuss the computer chassis electromagnetic radiation, mainly radio frequency radiation, followed by intermediate frequency leakage.
Radio-frequency radiation from the computer high-speed work of the switching signal leakage, such as the main frequency of the CPU is one of the energy of radiation, graphics cards, monitor output lines, keyboard connectivity, are the computer operating characteristics of the source of leakage out of the computer is also the main part of the computer security precautions.
For the absorption of radio-frequency radiation, the current best is the use of copper materials, the use of other metals can also be, the thickness of enough weight on the line.
The most vulgar description, that is, you can sit in the chassis is a good thing.
2: Generally speaking, the outside of the chassis is usually composed of a layer of more than 1 millimeter of steel plate, the thickness of the steel plate and the material is directly related to the rigidity of the chassis as well as sound insulation and resistance to electromagnetic radiation. Regular manufacturers of chassis used in the steel plate thickness are not less than 1.3mm, but there are some small manufacturers use the thickness of only 1mm or so of the steel plate, we do not need that ruler to measure, as long as you run him up, in the same volume, the heavier the chassis is the better, in addition, you can also use your fingers to play the shell of the chassis. If you can hear the crisp knocking sound to prove that the chassis steel plate is relatively thin and brittle, if you hear a more dull and heavy sound that the chassis material must be good, a good steel plate is generally plated with a very thin layer of zinc (bright part), in this case, can withstand the strength of high impact resistance, hardness, elasticity and strong. Chassis frame part of the steel used is generally a high hardness of high-quality materials folded into the shape of an angle or strip, we can remove the shell of the chassis frame vigorously with a hand shake. Good chassis should be more stable, while poor quality chassis light is easy to shake. Selection of the time to pay attention to the chassis outer and inner bracket edge incision is smooth, a good chassis will not appear chassis burrs, sharp mouth, burrs and other phenomena. The poor quality chassis appear the above phenomenon, the installation often "blood splattered". Generally speaking, the chassis in the factory, after the corresponding grinding treatment. Some of the steel plate edge burrs are smoothed, the corners are rounded, and some corners will be folded up accordingly. Installation of such a chassis, you will not worry about giving cuts, while some rough workmanship of poor quality chassis is often easy to scratch the hand.
3: a chassis type
There are many types of chassis. The more common are AT, ATX, Micro ATX three. AT chassis should be the full name of the BaBy AT, mainly used to support the installation of AT motherboards can only be installed in the early machine. ATX chassis is currently the most common chassis, support for the majority of the types of motherboards now. micro ATX chassis is the ATX chassis based on the establishment of the basis of the chassis, in order to further save desktop space, and therefore more than the ATX chassis. and are thus smaller than ATX chassis. Each type of chassis can only be installed in the type of motherboard it supports, generally can not be mixed, and the power supply is also different. So you must pay attention when shopping. There is also a type of NLX chassis, which is not necessary to introduce because it is not easy to encounter. In addition, there are slim, half-height, 3/4-height, full-height and vertical and horizontal chassis. 3/4-height and full-height chassis have three or more than three 5.25-inch drive mounting slots and two 3.5-inch floppy drive slots. Ultra-thin chassis are mainly special industry chassis with only one 3.5-inch floppy drive bay and two 5.25-inch drive bays. Half-height chassis are mainly Micro ATX chassis, which have two or three 5.25" drive bays. When choosing, it is best to take the standard vertical ATX chassis as the basis, because it has a lot of space, more mounting slots, good expandability, and good ventilation, which is fully adaptable to the needs of most users.
Two, box material
1, galvanized steel
Chassis box material is an important condition of the choice of chassis. At present, most of the chassis box using galvanized steel, the advantages of this steel is better corrosion resistance. As we all know, steel exposed to more humid air is prone to corrosion, and galvanized steel can rely on * in the air to form a dense oxide protective layer of zinc metal to protect the internal steel structure. In the case of being scratched, the relatively active galvanized part can be used as a sacrificial anode to delay the rusting of steel, galvanized layer relatively thicker steel corrosion resistance is stronger.
2, painted steel
A few manufacturers of products using only painted rust paint or even ordinary paint steel, such a chassis is best not to buy.
3, magnesium-aluminum alloy
For the magnesium-aluminum alloy chassis facing the audiophile players, due to the dense oxidation layer on the surface of the protection, there is no need to consider the problem of corrosion.
Compared with the observation of workmanship, the average consumer may be more difficult to judge the merits of the materials used, a simple method is to dismantle the chassis, with the naked eye to observe the internal structure and the thickness of the steel used in the side panels, or to lift the chassis to estimate its weight. But this method is not entirely effective, using high-strength steel, structurally designed chassis can ensure sufficient strength on the basis of minimizing the weight of the chassis, after all, excessively heavy iron pimples whether in the use of maintenance are not convenient.
Generally speaking, the more famous chassis manufacturers produce raw materials import channels as well as quality control is very strict, exquisite workmanship, solid materials, but the chassis workmanship and materials and costs are closely related to these brand-name products, most of which are priced at a high price. But even so, in the case of funds allow, should also try to choose the products of large manufacturers.
Three, the front panel
In addition to the box, the front panel of the material is also very important. Most of the front panel made of engineering plastics, the composition includes resin matrix, white filler (common cream front panel), pigment or other color filler (with other colors of the front panel), plasticizers, anti-aging agents, etc., with good front panel strength, high toughness, the use of a few years will not be aging yellow; and poor-quality front panel strength is very low, easy to damage, and use for a period of time will turn yellow.
One more thing to note is that the front panel modeling is more complex chassis, such as cartoon modeling chassis, due to the panel mold processing difficulties, which will result in an increase in cost, so we recommend that consumers, cheap cartoon chassis as far as possible not to buy, because it can not guarantee that the workmanship of the chassis and the material is good enough.