Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Nominal frequency (Hz)

Required number input.

Measured frequency (Hz)

Required number input.

Compute the signed frequency error of a crystal oscillator in parts per million. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Frequency error (ppm)

The resulting frequency error returned as a number.

• Oscillator estimates use nominal component values and simplified resonator models. Load capacitance, parasitics, drive level, startup margin, phase noise, temperature, aging, pulling, and amplifier nonlinearities determine the realized frequency and stability.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Crystal Tolerance Window

  Convert a crystal or oscillator tolerance in parts per million into an absolute frequency window in hertz.

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• Audio Crossover Slope

  Find signed filter attenuation slope in dB per octave between two measured frequencies; nonlinear transitions need more points.