| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem in which a frequency of a clock signal to be output by a sub clock arrives at a peak at a predetermined temperature, and the frequency drops even when shifted to any of a low temperature side and a high temperature side, and thus, upon measuring the frequency of the clock signal of the sub clock for a correction, if a temperature of the sub clock deviates from a temperature value at which the temperature thereof arrives at the peak, the frequency of the clock signal drops, and should a correction is performed based on a measurement result having the temperature of the sub clock ignored, the correct correction cannot be performed to a counting result.SOLUTION: A frequency of a clock signal and a temperature of a sub clock are measured, and the measured frequency of the clock signal and temperature value of the sub clock are stored as correction data. A clock device corrects the measured frequency of the clock signal by the temperature value of the sub clock, and corrects a time to be displayed on the basis of the corrected frequency. |
