#0.66

ACREL AKH-0.66K-Φ SPLIT CORE CURRENT TRANSFORMER FOR CABLE

AKH-0.66K-Φ split core current transformers for cable are mainly used in industrial mid-city power grids and rural power grid renovation projects. They are easy to install, and do not need to disassemble the busbar of the primary side. They can also be operated with power on, without affecting the normal power consumption of customers,which can save manpower and material resources, financial resources and increase the efficiency. This series of current transformers can be used in conjunction with relay protection, measurement and metering devices.

Specification of AKH-0.66K-Φ Split Core Current Transformer For Cable

Type

Ratio A)

Burdern(VA)

Class 0.2

Class 0.5

Class 1.0

K-Φ24

150/5

1

200/5

1

250/5

1.5

300/5

1.5

K-Φ36

300/5

1.5

400/5

1.5

500/5

2.5

600/5

2.5

Features of AKH-0.66K-Φ Split Core Current Transformer For Cable

01

It can be used in conjunction with the AMC16 multi-circuit monitoring instrument for the transformation of the power distribution system of 100A and below in the communication room;

02

It has beautiful appearance, convenient installation and wiring;

03

It is specially used for transformation, and there's no need to remove cables for live installation, and it is economical.

As known, in June 21, 2016, Epson introduced 3LCD 5040UB/5040UBe (EH-TW9300) and Pro Cinema 4040 projectors with 4K UHD and HDR support for under $3,000. Unlike UB models, UBe projectors have module for support wireless HDMI technology based on the well-regarded WirelessHD standard. Of course, they are more expensive about $ 300. These models used wobulation (e-shift, pixel-shifting or 4K- Enhancement) technology for increasing the resolution to 3840 x 2160. But, this resolution differs from Native 4K (4096 x 2160) and True 4K. As known, True 4K with Two-Phase or Four-Phase Pixel Shifting use 0.66" DMD chip (2716 x 1528) or 0.47" DMD chip (1920 x 1080), but with the division of 4K images into 4 arrays and their shift. Of course, the simultaneous use of several different names for one technology may confuse some consumers. Today, wobulation technology for video processing in projectors use the following names: - JVC - e-Shift or eShift; - Epson - 4K Enhancement or 4KE; - Texas Instruments - TI UHD (informally). However, many prefer the more common name pixel-shifting or Pixel Shifting. Of course, some experts sometimes argue about the validity of using the 4K name for all these technologies. Indeed, pixel-shifting does not increase the physical number of pixels. But these disputes are linguistic in nature, because wobulation really enhances the clarity of the image in its visual perception. At the same time, this technology has radically reduced the cost of producing projectors with support for 4K resolution. As a result, today the market offers a wide range of models at a relatively affordable price.

HC 5050UB / 5050UBe

In 2019, the company introduced the new HC 5050UB / 5050UBe, which replace the 5040UB / 5040UBe (TW9400 for Europe) of 2016. Traditionally, the UBe model has a 4K wireless HDMI transmitter and costs $ 300 more. Of course, the novelty supports all functions of the previous model. In addition, it offers an improved pixel-shifting algorithm with higher efficiency, HLG support for HDR UHD content, new Digital Cinema color mode with full DCI-P3 color gamut and 18 Gbps HDMI 2.0 port., which supports 4K / 60p HDR games.

Lumen Output

New models provide 100 ANSI lm more compared to 5040UB (2,600 vs 2,500 lumens). But, the brightness value for Epson has some specific features due to the peculiarity of LCD projection technology. As known, the light from the source in 3LCD projectors is reflected from the mirrors of the optical unit. In fact, these dichroic mirrors perform the function of color filters, passing only a certain color (red, green and blue or R, G, B). After separation, the three light streams are directed to the corresponding LCD monochrome matrices, which, after modulation, form a black-red, black-green and black-blue image at the output. A prism unites them and forms a color image, transferring it further to the optical system, the lens and to the screen. Thus, all three color components are projected onto the screen at the same time, providing the same white light output and color light output (CLO). This aspect is an important difference between 1 chip DLP projectors and 3LCD models. The perfect balance between white / color light output really affects image quality. Of course, Epson actively uses this advantage, periodically presenting the results of various tests. Therefore, Epson, unlike other companies, always specifies two values in the specs of its models. In particular, the company indicates CLO (Colour Light Output) and white light output, once again reminding of this advantage. Of course, both of these values are always identical. The video at the end demonstrates the difference in color saturation of 3LCD vs 1-chip DLP models. Epson measures white light output in accordance with traditional ISO/IEC 21118 standard and CLO in accordance with IDMS 15.4 standard, which was first published in May 2012.

Improved pixel-shifting algorithm (4K PRO-UHD), HDR mode and lens

Epson 5050UB uses second generation of 4K-Enhancement, which is called 4K PRO-UHD. In particular, 4K PRO-UHD uses a pixel plate with tighter tolerances. As a result, the engineers have increased angle of the leading and trailing edges of the electronic shift pulse, reducing the delay between the bottom and the top of the pixel shift change. According to the company, this improvement reduces downtime, increasing the light output, color accuracy, and performance, in general. In addition, Epson indicates DCI 4K (4096 x 2160) for 5050UB vs 3840 x 2160 for 5040UB. Moreover, the company has improved HDR support. In particular, the new projector automatically detects HDR content, including HDR10 and HLG, and supports its setting from the menu. As known, this line of projectors uses a 3-axis motorized lens. Unfortunately, the previous models had a rather large lag. Now, engineers have reduced electrical noise of the control system, increasing the smoothness of its work. In addition, the improved system has an auto-centering control, which is activated by the “LENS” button.

Conclusion

As known, fierce competition and new digital technologies have provoked an innovation revolution in the consumer electronics segment. Of course, high-tech projectors are no exception. As a result, companies radically expanded their functionality and improved almost all specs, including resolution, compactness, contrast ratio,, brightness, throw ratio, etc. Of course, the quality of image directly depends on the resolution, which, in turn, affects the detail and sharpness. Therefore, almost all leaders pay great attention to this aspect. As a result, today the market offers a fairly wide range of Home Theater 4K HDR projectors. For example, in 2019, the companies presented BenQ HT3550 (W2000), Epson HC5050UB, Sony VPL-VW295ES, etc.

Resolution

As known, devices use pixels for displaying an image on the screen. The screen of modern models contains millions and more pixels. The number of pixels affects the screen resolution of any device. For example, a screen of 1920 x 1080 (Full HD or Full High Definition or1080p) displays 1920 pixels horizontally and 1080 pixels vertically, creating a grid of 1080 lines. In turn, each row contains 1920 pixels. Accordingly, such images contain a total of 2,073,600 pixels (1920 x 1080).

In recent years, Full HD devices compete fiercely with the more expensive 4K models. But gradually, innovative technologies and new, more efficient processing algorithms reduce the cost of 4K models. Until recently, companies offered only 4K TVs. However, in the past few years, many companies began to produce relatively inexpensive 4K Home Theater projectors. But this is certainly a pleasant trend, has a slight drawback. Lack of unification and marketing considerations sometimes create confusion in terms. For example, today companies use several names simultaneously for their 4K models, including 4K-Enhancement, Native 4K, or True4K. Of course, the buyer has a reasonable question about the differences between these technologies.

Native 4K

As known, digital film projectors were the first to start using 4K resolution. These models supported Cinema 4K resolution (4096 x 2160). Such projector provides 4096 pixels horizontally and 2160 pixels vertically. Respectively, they do not use additional image processing and provide a resolution of 8.8 MPix or, more precisely, 8,847,360 pixels. For example, the Sony VPLVW285ES really suppots such resolution.

Such models use DMD (DLP technology) chips with 4096 x 2160 micromirrors or LCD screens with the same number of pixels in 3LCD projectors. Some projectors also use hybrid 4096 x 2160 LCoS chips with functions of DMD (Digital Micromirror Device, Texas Instruments) and LCD chips. Such models instantly pass the 4K signal without pre-processing. Unfortunately, these models have a high cost, which reaches $ 5,000 and more.

E-shift (1080p Pixel Shifting or wobulation)

The very popular Epson 4K-Enhancement 5040UB refers to e-shift projectors.

These Home Theater models are much cheaper. They provides playback of 4K content, but use DMD or LCD chips with only 1920 x 1080 pixels. Of course, the 4K playback requires an array with 4096 x 2160 micromirrors or similar LCD screen. But, the production of 4K chips requires very high accuracy, which increases their cost. Therefore, companies have developed a Wobulation (4K-Enhancement or Pixel Shifting or e-shift) technology that provides 4K resolution support using chips with a resolution of only 1080p or Full HD. Engineers solved this problem as follows. The projector processes and splits 4K signal into two which a resolution of only 1920 x 1080 pixels. Then, the device alternately projects both pictures onto the screen. But these images are shifted half a pixel relative to each other diagonally. As a result, each pixel has a shift in relation to the pixel of the second picture.

But the viewer perceives these two Full HD pictures as one 4K due to high speed. In fact, the projector displays about 2 MPix x 2 in per cycle. Of course, the e-shift option does not support 3D mode, which also uses alternation of frames for each eye. In this case, the projector automatically disables the wobulation.

True 4K

True 4K supports lower resolution than real 4K. They provide the standard 2160 pixels vertically, but only 3840 (instead of 4096) pixels horizontally. Accordingly, their real resolution reaches only 8.3 MPix (instead of 8,847,360). Companies often call these projectors 4K UHD models. This value corresponds to the 4K TVs. True 4K projectors use two ways to create a projection. Two-Phase Pixel Shifting This technology is similar to e-shift. But, these models use a Texas Instruments 0.66" DMD chip with a 2716 x 1528 pixels. For example, Chinese JMGO U1 has such chip.

Such chip uses a matrix with 2716 x 1528 micromirrors. Each micromirror corresponds to one pixel. The algorithm transforms the input picture into two (4.15 Mpix each). Then, after shifting, it alternately displays two pictures. Of course, each picture contains half of the original. Accordingly, the viewer perceives a picture with 8.3 MPix, which almost corresponds to 8,847,360 native 4K. Four-Phase Pixel Shifting These models use a chip with a resolution of only 1920 x 1080p (0.47" DMD chip). For example, the popular BenQ TK800 belongs to such projectors.

But these projectors divide 4K signal into 4 pictures. Then processor shifts them relative to each other and sequentially displays, switching between them. Accordingly, the sum of four 2 MPix images reaches about 8.3 MPix. But the viewer perceives them as a single picture of 8.3 MPix due to high speed. But physically, the processor simultaneously displays only one quarter of the image.

Conclusion

Of course, all these technologies provide different image quality. But it becomes visually noticeable only when playing quite complex graphics and practically does not appear when playing traditional video.

Optoma UHD60 is considered one of the best 4K HDR projectors in the segment up to $ 2,000.00. Today, it costs only $ 1,799.00, but some online stores offer this model even for $ 1,599.00. At the same time, Optoma UHD60 provides the highest brightness (3000 lm), the highest dinamic contrast ratio (1,000,000: 1) and the lowest noise level (only 28 dB) in its class. As known, the Optoma UHD60 uses the 0.66" DLP chipset. But most of its competitors today use the new 0.47" DLP chipset, including the ViewSonic PX727-4K ($ 1,299), the Optoma UHD50 ($ 1,499), and the BenQ HT2550 ($ 1,499). New chipset is cheaper and consumes less. On the other hand, the cost of the Optoma UHD60 with 0.66" DLP chipset also dropped. But the larger chip provides higher contrast, working with lumen output and contrast.

Brightness

Optoma UHD60 provides 3000 lm in Bright mode. Unfortunately, image in this mode has a clear green tint. The remaining preset modes are less bright, but provide much better color accuracy. Of course, the UHD60 uses a BrilliantColor technology in the range from 1 to 10. As known, this technology uses six-segment color wheel to increase the brightness and saturation of the image by increasing the level of tints. As known, it affects the saturation and contrast. Except Reference mode, its default value is 10 in all modes. In this case, the color brightness reaches only 55% of white, which provides lower color saturation and brightness compared to white. Decreasing the BrilliantColor setting reduces the white level while maintaining the brightness level of the color. For example, a decrease from 10 to 6 reduces the luminous flux by about 17%, but the color does not change. In this case, the brightness of the color will be about 70% of white, increasing the saturation of the color and its contrast. Thus, the maximum BrilliantColor is optimal for a room with some ambient light, a large screen or a low-gain screen. However, in a dark room you may want to experiment with BrilliantColor in the range from 5 to 7. ANSI lm for modes with BrilliantColor of 10: - Cinema – 1260; - Vivid – 1591; - HDR – 1021; - Bright – 2710; - Game – 1525; - Reference -515. Eco mode reduces light output by 37%, but is only available without Dynamic Black.

Features

The model uses a 1.6x zoom lens that loses 26% of the maximum light flux. Of course, this is too much for such a zoom lens. But, reducing the distance to the screen solves this problem. The UHD60 has an input lag of 63 ms with Dynamic Black on and 56 ms with Dynamic Black off. The UHD60 uses an RGBCY wheel, which sometimes generates traditional for DLP technology rainbow effect (colored artifacts around the object contour). However, the optimal settings for brightness, contrast and white level effectively reduce this effect. Dynamic Black mode increases dynamic contrast ratio to 1,000,000: 1. Wobulation technology increases the real resolution of the DMD matrix (2716 x 1528) to 3840 x 3160. The UHD60 uses two 4-watt speakers, which provide a fairly loud sound and a good bass range. But, of course, serious home theater will require the full surround system. Service life lamp reaches 4000 hours in full power mode, 10,000 hours in eco, and 15,000 hours in Dynamic Black mode. But a new lamp for the UHD60 today costs only $ 199. A 1.6x zoom lens provides a projection distance of 12 to 19 feet for a 120-inch screen. Moreover, the internet offers various Projection Calculators for a quick and easy solution to this problem. Additionally, the low noise level does not limit the choice of its location. But using the wider angle end of the zoom will maximize light output. The UHD60 has a built in throw angle, but unfortunately small lens shift.

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