| 摘要 |
A method of evaluating quality of a crystal unit, capable of performing quantitative measurement of an actual operation of a crystal unit which is to be oscillated in an actual oscillator to ensure an accurate quality evaluation, is provided which comprises the steps of increasing a DC input voltage of a crystal oscillator, said crystal oscillator having at least one AGC amplifier whose amplification rate varies depending on the DC input voltage and having a crystal unit connected thereto; measuring a maximum value of the DC input voltage at a start of oscillation of the crystal oscillator; and evaluating quality of the crystal unit by the measured maximum value.
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