Nominal Frequency and Tolerance

Under the correct matching of the oscillation circuit, the frequency output from the oscillation circuit is called the "nominal frequency". The frequency unit is generally expressed in megahertz (MHz) or kilohertz (KHz)
In actual mass production and oscillation circuit applications, products will have some frequency dispersion errors relative to the center frequency in room temperature environment (25 ℃) The maximum dispersion value of the allowable error for this type of frequency is generally expressed in ppm (parts per million) or% (percent)