Number of times per second that a screen moves backwards and forwards. The unit of frequency is the herz (Hz) which equals 1 cycle per second. Low speed screens however, usually have the frequency measured in strokes per minute.
Number of times per second that a screen moves backwards and forwards. The unit of frequency is the herz (Hz) which equals 1 cycle per second. Low speed screens however, usually have the frequency measured in strokes per minute.