(1) Volume Weight When purchasing a projector, you should first consider such factors. If the projector is used in an office, the weight does not have to be considered, but if we often use the projector to go out for entertainment, because most of the time we have to carry the projector with us, then the volume is the first consideration.
(2) Scan range According to the horizontal scan frequency scan range given on the technical indicator, the three frequencies can be selected from the high, medium and low frequencies to calculate the image resolution corresponding to the three frequency points. Check if the projector can display properly at these three resolutions. If the line is not synchronized, that is, the screen is twisted or shaken, indicating poor horizontal scan tracking.
(3) Focusing performance Using the test square generated inside the projector, or the signal generator, computer-generated test squares, the focus is adjusted to the optimal position, the contrast of the image is changed from low to high, and the squareness of the square is observed. Whether the vertical lines are blurred or not, if any, the focusing effect is not very good.
(4) Video bandwidth Video bandwidth directly affects the details of the video. Use a computer or a signal generator to generate a white background graphic signal that can be reached by the projector with the highest resolution, and observe whether the smallest character graphic on the screen is clear. If the video bandwidth of the side machine is insufficient, the lines displayed on the screen are more real, and the vertical lines are imaginary, and the image details are blurred.
(5) High picture quality Projected picture quality is indispensable, and should also be a consideration for purchasing a projector. A projector with good picture quality should have a clear picture. For example, black should be black, not gray or even “blue and blackâ€; be clear and sharp when displaying text.
(6) Installation method The projector installation method is divided into table type front projection, table type rear projection, and ceiling rear projection. The front projection is on the side of the projector; the rear projection is on the opposite side of the screen with the audience. If you use it temporarily, you can choose a table-style front projection. This method is affected by the ambient light and the layout is messy. For fixed use, the ceiling method can be selected. If the space is large, the overall effect of choosing the rear projection method is the best. If the space is small, the method of rear projection refraction can be selected.
(7) Resolution The resolution of the projector is inseparable from the connected computer. At present, most users actually have SVGA-type projectors, so as a general commercial application, SVGA can meet the need for demonstration in all occasions. Of course, in order for everyone to buy the projector to show the most beautiful demonstration effect, Xiao Bian suggested that everyone adjust the resolution of the computer to be consistent with the projector they purchased.
(8) Brightness The current industry trend for business projector brightness is: 3000 lumens will replace 2500 lumens to dominate the business market as the mainstream trend. If it is a smaller conference room, you can consider about 2500 lumens or less, and if it is a larger clubhouse or lecture hall, consider a machine with more than 3000 lumens. The specific recommendations are: In general, 15-30 square meters of small classrooms, do not need too bright projector, 2500 lumens is enough; 30-60 square meters of classroom, the best choice for 3000-3500 lumens around the model; more than 70 The square meter classroom is recommended for models with 4000 lumens or more.
(9) The lamp as the only consumable material of the projector is an important factor that must be taken into consideration when purchasing the projector. At present, three types of light sources, metal halide bulbs, UHE bulbs, and UHP bulbs, are commonly used in projectors. Since the advantage of UHE bulbs is moderate price, brightness is almost not attenuated until 4000 hours ago. UHP bulbs are also an ideal light source, but they are relatively expensive and are generally used in high-end projectors.
(10) Selection of Brands There are more mainstream brands of projectors currently on the market, such as Sony BenQ Aipu’s birthday. Choosing a big brand not only uses the experience stick, but even afterwards, after-sales maintenance is more timely and convenient.
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Zero Phase Current Transformer
PCB Mount Type current sensing transformer
A Current Transformer (CT) is a type of transformer that is used to measure alternating current (AC). It produces a current in its secondary which is proportional to the current in its primary.
Current transformers, along with voltage or potential transformers, are instrument transformers. Instrument transformers scale the large values of voltage or current to small, standardized values that are easy to handle for measuring instruments and protective relays. The instrument transformers isolate measurement or protection circuits from the high voltage of the primary system. A current transformer provides a secondary current that is accurately proportional to the current flowing in its primary. The current transformer presents a negligible load to the primary circuit.
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FAQ
1-MOQ?
We will work hard to fit your MOQ .Small purchase quantity is ok.
2-Payment term?
T/T, Western Union, Paypal, Credit Card
3-Delivery port?
Shenzhen, Guangzhou, Zhongshan, Hongkong.
4-Shipping date?
About 7 days when we check the payment.
5-Do you produce the core and bobbin by yourself .
Yes.we have 2 head company,1 subsidiary company.one is bobbin factory,one is core factory,last one is transformer factory.
6-Where is your factory?
In ShaanxI
Zero Phase Current Transformer,Dc Immune Current Transformer,Protection Current Transformer,Ring Type Current Transformer
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