| 摘要 |
PROBLEM TO BE SOLVED: To automatically change the measurement accuracy of a frequency ratio, according to the fluctuation state of the frequency ratio without having to change the measurement cycle from the outside. SOLUTION: A measuring device measures the frequency ratio between a comparison clock signal and a reference clock signal which are independent of each other. The measuring device compares the difference between the frequency ratio measured with a specific timing and the frequency ratio measured at a timing, after a predetermined measurement cycle from the specific timing, and a reference threshold, set in advance. The measuring device controls the measurement cycle of the frequency ratio, based on the comparison result. COPYRIGHT: (C)2011,JPO&INPIT |
