【 Weak current College 】 projector works great issues resolved!! ---Power By 【 China power house network 】

Q: what is a multimedia system ground protection?

A: in multimedia systems, to be used in a variety of devices such as projectors, computers, matrix switch and splitter, CD, DVD and central control system, etc. Since most devices use the switching power supply, signal ground is actually caused the floats to signal between the ground is not in the same electric potential, potential difference exists, serious may reach 100 v. When all signal connection use due to ground potential inconsistencies, it will cause the image scrolls with Anilox, low-frequency interference phenomenon, or cause errors in the Panel is out of control, serious or even direct breakdown of integrated circuits and other components. Therefore, two-phase and three-wire system of power systems, system design, the power cable should comply with the fire left zero, right, Center protection rules; in three-phase four-wire system of power supply system, should, as far as possible, using the same two phase. Particular protection and must be of the same ground, and make sure it is connected, to ensure that all devices have the same reference with the ground. This will prevent the emergence of various interference phenomena.

Q: projection Engineering (rear projection) mirror what role?

A: in rear-projection engineering installation, the regularly encounter projection space limited space. To resolve this problem, you can use the rear-projection screen dedicated reflector system, which uses mirrors to show beam reentry once or twice, in the show insufficient space for the projection distance to reach the show distance to ensure screen size. Reflectivity is greater than 90%, mirror flatness ± 0.02mm, can guarantee the projection lamp brightness of losses to reduce to a minimum range.

Q: what are the projection project commonly used interface device?

A: Distributor: single signal and no signal loss cases are divided into multiple identical signal, the output to multiple display devices. Selector: multi-channel input signal selection among all the way to output to the display device. Matrix Switcher: combines multiple signal sources to select two or more output to different display devices. In addition to switching devices; x-line, etc.

Q: which occasions require application projector mosaic technology?

A large telecommunications system:, road traffic management, energy distribution, transport, process control, 110 alarm etc, panoramic view, complex control, unified command projection applications, you should choose the big-screen splicing system. Ordinary users to simultaneously watch the sources of information, suitable for a small selection of single use.

Q: engineering, projector and source distance, projection screen are affected?

A: projector and source distance, projection screen are affected. Projector installation requires length long power cable and signal wires, it is necessary to pay attention to the quality of the signal line, select the coaxial cable of good quality, distance too long causing signal attenuation, you want to use a signal amplifier.

Q: projector lift, there is nothing special attention?

A: most projectors are equipped with picture upside-down function, this function allows the projector to the top in the housing using hoisting. In the installation project, the following points should pay particular attention to:

* Calculation of the projector and the distance between the screen (to screen size)
* Wall hanging on the edge of the screen should be hoisting projectors lens at the same horizontal lines
* Overhead projector lens Center and screen center point in the same vertical line
* Select the appropriate install hanger dimensions
* Install the screws, fixing bolt tightening in place
* Adjust the projection screen after installation of the trapezoid
* After installation, ensure that turn off the power (real close without a remote control shutting down)