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VELTEK cameras are unique because of their “Flickerless” control. The Flickerless control is available on VELTEK Cameras either in the OSD (On-Screen Display and Adjustment Menu) for Models CVC2830D, CVC4150D, CVC3100, CVC2730D and VELCAMS CVC5240 and CVC5230 or as the fifth dip switch on Models CVC4160D, CVC2760D and VELCAMS CVC5220 and CVC5210. If you ever watched the evening news when during the broadcast they show a computer screen, you may recall that the computer screen appears to pulsate, flicker and/or even roll. The main purpose of Flickerless is to overcome this effect which is the harmonic power frequency difference between the cycle of 50 Hz fluorescent lighting and the vertical synchronization of the camera which causes the “flickering” on a monitor. The 50 Hz power cycle of a fluorescent light causes a “pulsating” image which is overcome by the Flickerless control. When pointing a camera directly at a sodium, fluorescent or mercury vapor light (or any other type of lighting with a strong, wide and intense range of color), you will notice that the camera will continually attempt to adjust to the high color temperature range of the lighting. Most CCTV cameras have a hard time capturing the intense color illumination because the camera cannot easily identify a frame of reference of “correct” color, causing the camera to cycle continuously. Because the lighting is too intense over the breadth of the color spectrum, the picture will cycle through blues, yellows and reds. VELTEK’s flickerless control actually takes into account the cycling process of the light sources and adjusts the color, gain, ESC and white tracking balance to produce a correct color picture. This feature sets VELTEK apart from a crowded field of CCTV cameras where the colors in the image are adjusted and therefore not true.
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