1. The power supply interferes with the 380 volt power supply, and the elevator uses a variable frequency motor, which affects the camera and the transmission line.
2. The frequency conversion motor interferes with signals of 0-6 megahertz, and the frequency of interference generated by the frequency conversion motor is between 0 and 1 megabytes, causing direct interference to the video signal.
3, the controller of the video signal interference is about 11 trillion controller, once it starts, it will continue to send control signals and 11 trillion control wave, the control signal will produce interference on the video accompanying cable;
4, electric fan and light interference on the video signal 50hz and derived a variety of frequency interference, the interference will interfere with the video image;
5, distance 75-5 cable transmission distance should be about 167 meters, and the transmission distance of the scene reached more than 600 meters, so that the intensity of the video signal is greatly reduced, so that the interference signal on the video signal to produce a strong interference.
By work method
It is divided into a needle Printer, an inkjet printer, a laser printer, and the like. The dot matrix printer prints character graphics by physical contact between the printer and the paper, while the latter two print character graphics by ejecting toner.
By purpose
Office and transaction general purpose printer
In this application area, dot matrix printers have always dominated. Because the dot matrix printer has medium resolution and printing speed, and the consumables are cheap, it also has the characteristics of high-speed skipping, multiple copy printing, wide-format printing, and convenient maintenance. It is the preferred method for printing reports and invoices in office and transaction processing. Model.
Commercial printer
Commercial printers are printers for commercial printing, as this area requires printing.
home printer
Home printer
The quality is relatively high, and sometimes the documents are well-documented. Therefore, high-resolution laser printers are generally used.
Dedicated printer
Dedicated printers generally refer to printers used in dedicated systems, such as various, passbook printers, flatbed printers, bar code printers, and thermal printers.
New printer
Bluetooth printer
The Bluetooth printer is a small printer that realizes the transmission of data through Bluetooth. It can print various small tickets and barcodes anytime and anywhere. The difference from the conventional printer is that it can operate the proximity card and can read the card number of the proximity card and The data of each sector can also be used for each
Sector write data.
Home printer
Home printers are printers that come into the home with a home computer. According to the characteristics of the home printer, low-end color inkjet printers have gradually become mainstream products.
portable printer
Portable printers are generally used in conjunction with laptops. They are small, lightweight, battery-operable, and easy to carry.
Network printer
Network printers are used in network systems to provide printing services for most people. Therefore, such printers are required to have fast printing speed, automatic switching of emulation modes and network protocols, and easy management by network administrators.
Universal printers are not subject to any material restrictions and can be used for color photographs and printing on flat materials such as wood, glass, crystal, PVC, ABS, acrylic, metal, plastic, stone, leather, cloth, and other textiles. Whether it's a simple block color pattern, a full-color pattern or a pattern with excessive color, it can be printed at one time, without the need for plate making, printing, and repeated color registration.
Printer
mini printer, portable printer,uv printer,home printer, T-SHIRT printer, small printer, 3D printer
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