A figure that describes the speed of the electron beam that creates the scan lines of a video or computer display. The horizontal scan rate for standard NTSC/PAL video is approximately 15 kHz. For VGA displays and above, scan rates of 31.5 kHz or more are used.
The frequency in KHz (kilohertz) at which the monitor is scanned in a horizontal direction; high horizontal scan rates produce higher resolution. The EGA horizontal scan rate is 21.8 KHz, while the extended EGA horizontal scan rate is 30.1 KHz.
The number of horizontal lines of information a video display can paint onto a screen in one second given in hertz (Hz – cycles per second).
The frequency, expressed in kHz (thousands of times per second), at which the horizontal deflection circuit operates. This roughly translates to the number of scanlines displayed on a monitor in one second.
Horizontal scan rate, or horizontal frequency, usually expressed in kilohertz, is the frequency at which a CRT moves the electron beam from the left side of the display to the right and back, and therefore describes the number of horizontal lines displayed. CRT timings actually include some horizontal scans before the visible display, after it, and during the travel from bottom to top (known as vertical back porch, vertical front porch, and vertical sync width, respectively, and collectively known as vertical blank time), so the horizontal scan rate does not directly correlate to visible display lines, unless the unseen lines are also known, but it can still be used to approximate the display lines, as the total blank time is usually a small but significant portion of the total lines.