To provide a method and an apparatus whereby a frequency change with time of a quartz oscillator can be measured in a short time surely.
According to the method for measuring frequency change with time of an oscillating element (for instance, quartz oscillator), based on a characteristic of an change with time of an oscillation frequency to a reference frequency of the oscillating element (S1), a characteristic of the change with time of the frequency corresponding to a power of a lapsed time is obtained for every factor influencing the change with time of the frequency of the oscillating element (S3-S5), and an evaluation formula for the characteristic of the change with time of the frequency of the oscillating element is calculated based on the characteristic for every factor (S6-S11).
KOBAYASHI SACHIHIRO