Q:What is the reason for monitoring the camera's black screen?

Second, check the next line is a problem, if the line is no problem, it may be a camera is broken, you can use the replacement method for testing, with a good camera to replace the test, if there is an image that the camera is bad The

Q:Seeking a few surveillance camera manufacturers

Hai Kang, Dahua, Yu as, with the Corning are domestic good, to see where you want to use, the environment is different from the choice of the camera is also different, the price gap is also great,

Q:What is the number of millimeters that monitor the camera?

Surveillance cameras generally see the 3.6 6 8 12 16MM These lenses are generally divided into wide-angle, ordinary, long focal length (these are fixed focus)

Q:What is the difference between monitoring the camera and the usual?

Video capture card: video capture card, also known as data acquisition card and image acquisition card, which is mainly used for security monitoring card, usually on the camera or camera and other signals to capture, and MPEG format stored in the hard disk PCI plug Slot card. Also known as video surveillance card. For more information, please visit: http://baike.baidu /view/3237786.htm

Q:Monitor inside the infrared network camera infrared light automatically switch and synchronous switch What does this mean?

Synchronous switching --- image color mode switching action by the fill light control, light image black and white, light off image color. The

Q:Why mobile phone surveillance camera is always not online

2, with the network cable through the computer connected to the switch, you can see the online camera, and can also be connected through the Wifi wireless network IPAD, notebook, first of all to see if this camera is to support mobile phone viewing, if supported and this IP CAM has Access to the public network, and the phone is a smart phone that can be remotely monitored online

Q:How to clean the surveillance camera

With a special degreasing clean cotton dipped in distilled water from the middle of the lens spiral to wipe out. Be patient and wipe a few times until the dust is wiped off;

Q:Monitor the camera's focal length 4 meters good or 8 meters good

Showing the shooting of the smaller the object, looking very far feeling. The larger the number, the shooting angle is small, shooting the display of the object is closer, look bigger.

Q:Hello, because no electric video recorder did not manually set, but I would like to look back a few days before the monitor can be transferred out

3, the operator will not operate the hard disk video recorder, did not correctly follow the normal steps to call the DVR video. 4, hard disk video recorder motherboard problems.

Q:Monitor the flash indicator on the DVR panel

Are you buying a new hard drive? The hard disk must be formatted