Scanning Frequency Vertical-Monitors
Scanning frequency is the speed of vertical scanning on the monitor screen or the number of video lines written on the screen every second (from top to bottom) and is measured in KHz. Scanning is the process by which an image is developed. The electron beams excite the phosphor on the monitor screen, dot-by-dot and line-by-line. Faster the scanning, more stable is the image. Scanning is done horizontally as well as vertically. This scanning is done as per a certain time interval expressed in frequency. Horizontal frequency is always more than vertical frequency. Expressed in Hz, in interlaced mode this is the number of fields written to the screen every second. In non-interlaced mode it is the number of frames (complete pictures) written to the screen every second (also known as refresh rate).