| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that a TCXO or OCXO can not guarantee the frequency accuracy of 1×10-8 for a long time of product service life and a rubidium oscillator or cesium oscillator can guarantee the frequency accuracy for the product service life but becomes extremely expensive. SOLUTION: Concerning this frequency oscillator, a cyclic pulse is extracted from the radio wave of a radio wave clock by a demodulation circuit 3 and with this cyclic pulse as a reference, the output frequency of a crystal oscillator 1 is measured by a counter 4. Thus, the output frequency of the crystal oscillator 1 can be highly accurately measured and by controlling this output frequency constant, the high accuracy frequency oscillator can be realized. |
