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You can use the following formula to obtain the amount of the change (ppm) in oscillation frequency with the change in a load capacity of the crystal oscillation circuit: Amount of the change (ppm) ≈ C1/(2C0+2CS)*10^6 C1: Series capacitance of a crystal oscillator C0: Parallel capacitance of a crystal oscillator CS: Load capacity of the crystal oscillation circuit For the series capacitance and parallel capacitance of the crystal oscillator, contact the manufacturer of that oscillator.