[ Pacific Security Network News ]
Today, projectors have entered the homes of ordinary people, the lowest price of 2, 3 thousand yuan, you can buy an entry-level product, and 7,800 yuan can buy high-definition projectors. It can be said that the price of the projector has dropped rapidly, allowing the working class to have the opportunity to enjoy large-screen movies at home.
Anyone who knows the projector at the store knows that dealers will tell us how high the brightness of this machine is, how high and high the contrast of this machine is, the resolution is high definition, and so on. If you don't know your friend about the projector, it may be difficult to understand the parameters mentioned in the dealer's mouth. Under the boast of the merchants, it is very easy for consumers to buy products that are not suitable for them.
In order to let everyone choose the projector again, we can choose the right product according to our own needs, and we will not be fooled by the parameters in the business. In this article, we introduce several main parameters in the projector and different The user should select which parameter product to explain in detail.
Brightness is not higher, the higher
In the parameters of the projector, the brightness must be the one that is lifted the most. Brightness, as the most important parameter indicator in the projector, determines the price of most products and determines the clarity of the projector's projected image in different environments.
The full brightness of the brightness, usually in lumens, is used to express the ability of the light source to produce a visual response within a unit of time. In a more general sense, the higher the brightness of the projector's projected image onto the screen, the higher the brightness of the product. In general, the higher the brightness of the projector, the higher its price.
In terms of the projector's existing technology, the lowest-end product brightness can also fully meet the needs of consumers, so brightness is not a key parameter of concern to the industry. But for consumers, is it better to choose a product with higher brightness?
Generally speaking, the high-end home theater projector has a brightness of about 1000 lumens, provided that you have a black and white audio-visual room. In this environment, the 1000-lumen projector can display the best results. However, if the ambient light is bright, the brightness will be somewhat inconspicuous.
Getting started entertainment, getting started business, and some low-end home projectors, the brightness will be around 2000 lumens, this brightness level can cope with low ambient light interference, suitable for use in the living room, small meeting room at home. The brightness of mainstream business education projectors is mostly around 3000 lumens. For small and medium-sized conference rooms and classrooms, this brightness is enough to meet the demand. The projector with about 4000 lumens is more suitable for use in large conference rooms, lecture halls, etc. Even in brighter environments, it can project a clear and large picture. Most projectors with 4000 lumens or more are counted in engineering projectors. Users have large clubs, auditoriums and other environments. Products with higher brightness will be used in stadiums and other environments, and can project very large images.
For individual users, if you are watching movies or playing games, you can choose 1000-2000 lumens to meet your needs. Excessive brightness will be detrimental to your eye health. The glare will also make your eyes Rapid fatigue.
Resolution to resolution HD
The resolution of the projector is developing faster and there are more types of resolution. The entry-level product has a resolution of only 800×600, while the highest resolution of the civilian grade reaches 1920×1200. In the home projector, the highest resolution is 1920×1080.
In the projector's parameter table, we can also see that the resolution generally has two indicators: original resolution and maximum resolution. The native resolution refers to the actual resolution of the product, which is the optimal resolution supported by the machine. The maximum resolution is the maximum resolution that the machine can be compatible with. When playing a picture or video of this resolution, the picture is usually compressed, which will affect the picture quality.
When it comes to home projectors, HD has become the main topic, and HD home projectors are also more popular with consumers. From the domestic standard point of view, HD resolution includes 720p, 1080i and 1080p. In the projector products, there are 720p models and 1080p models, and the price difference between the two products is large.
The 720p projector is 1280×800 resolution, which is more suitable for watching TV or playing games. The price of the machine is generally 5 or 6 thousand yuan, and the price is very high. The 1080p projector must be at least 7,000 yuan, and a slightly better product will cost more than 10,000 yuan. It is suitable for building a home theater and playing Blu-ray movies at home.
When choosing a projector, we need to distinguish the difference between the original resolution and the maximum resolution, and also distinguish the difference between 720p and 1080p. Don't let the business a high-definition projector be deceived.
Million contrast is not known
In home projectors, resolution is one of the most important indicators. We all know that watching movies, especially in dark scenes, the layering of the picture and the display of details are indispensable, which requires high-contrast projectors to display.
Under normal circumstances, the larger the ratio, the stronger the brightness contrast from black to white, and the richer the gray level gradient, the richer the color performance. On the other hand, if the ratio is smaller, the most intuitive impression is that the white is not bright enough, the black is not deep enough, the gray of the picture is concentrated in a small range, there is a gray feeling, and the detail performance is worse.
In our daily tests, there are two ways to test the contrast. One is the full-on/full-off test, which is the ratio of the brightest picture to the darkest picture average of the projector. The other is ANSI contrast. , in the same picture, project black and white pictures, test the ratio between black and white pictures. The difference in contrast data obtained by the two test methods is large, but it can reflect the contrast performance of the picture to some extent.
On the manufacturer side, especially the 3LCD manufacturer, there is a change in the dynamic contrast ratio, that is, the contrast ratio of the test screen after the liquid crystal projector is turned on, and the value far exceeds the contrast value we usually say. For example, the contrast of a branded product can reach up to one million to one, which is tested by dynamic aperture. More manufacturers will also indicate the native contrast of the product, which is the value obtained using our traditional test methods.
When choosing a home projector, if you are not a particularly rich user, then the pursuit of excessive contrast performance does not make much sense. In particular, the dynamic contrast ratio of up to one million is hard to distinguish with the naked eye.
Lamp life is also a parameter that users who want to buy a projector are most concerned about. Although the life of traditional ultra-high pressure mercury lamps has improved with the development of technology, 3 or 4 thousand hours is still a limit life. When the manufacturer tests the life of the lamp, it will attenuate the projection lamp to the original brightness for the normal life of the lamp.
In the past, the life of a projection bulb was usually 2000-3000 hours. In recent years, the brightness of the projector's bulb has reached 6000 hours. At first glance, the growth of life is really a lot, greatly extending the life of the bulb.
Don't look at the values, but look at the patterns in front of the numbers. At present, the standard lamp life of the projector on the market has two modes, one is the normal mode, generally 3000-4000 hours; the other is the ECO mode, which is the energy-saving mode we often say. In this mode, The brightness of the projected picture is reduced to extend the life to a maximum of 6000 hours.
When we buy the projector, don't listen to the business to promote the projector lamp life of up to 6000 hours, you must be fooled, it is the long life that you get when you sacrifice the brightness, if you use the normal mode, the bulb Life expectancy will drop dramatically to normal levels.
Swaco BEM-3 Shaker Screen
Replacement Swaco Bem-3 Shaker Screen– Hook Strip Flat Screens
SJ-Swaco BEM-3 Shaker Screen with dimension of 1155× 903mm, is produced to meet the exact API specifications as a replacement screen for BEM series shale shakers from M-I SWACO. It is commonly compatible with the BEM-3 shaker. Banded steel hook edges prevent the screen from flattening and eliminating mesh pull-out caused by fine wire mesh or high tension screens. There are various mesh combinations available according to different drilling applications. XR or XL mesh range from API 18 to API 325.
Technical Parameter
- Mesh Material: stainless steel 304/316/316 L.
- Frame Material: Q235 steel.
- Screen Type: XL, XR.
- API RP 13C Designation: API 18 – API 325.
- Package: packed in paper carton, shipped by wooden case.
Adaptable Shale Shaker Model
SJ-SWACO BEM-3 shaker screens are used as the substitute screen for
- SWACO BEM-3 shale shaker.
Competitive Advantage
- 100% interchangeable with OEM brands screen panel size.
- SS 304/316 wire mesh cloth does not rust or delaminate.
- Hook strip soft screen with maximum non-blank areas.
- Manufactured according to the API RP 13C (ISO 13501).
- Scientific & reasonable cost control system for competitive price.
- Adequate inventory in the shortest time to meet customers' demand.
Remarks:
M-I SWACO, ALS-2 are marks of M-I L.L.C.
ShengJia only produces the replacement screens but not original from M-I SWACO.
Swaco BEM-3 Shaker Screen
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