| 摘要 |
PROBLEM TO BE SOLVED: To make oscillation frequency uniform at a normal temperature after oscillation frequency adjustment by setting an oscillation frequency target value corresponding to the temperature characteristic of each quartz oscillator. SOLUTION: A quartz oscillator is set, and an oscillation frequency F0 at a normal temperature before frequency adjustment is measured by a counted and is stored in a storage device 17, and thereafter, the quartz oscillator is heated to a temperature for oscillation frequency adjustment by temperature setting 21. An oscillation frequency F1 after heating is measured by the counter and is stored in a storage device 18. Oscillation frequencies F0 and F1 are inputted from storage devices 17 and 18 to a computing element 19, and an oscillation frequency differenceΔF between frequencies F0 and F1 is calculated, and this differenceΔF and a reference oscillation frequency are inputted to a computing element 20. The reference oscillation frequency after calculation obtained by shifting the original reference oscillation frequency byΔF is inputted to a comparator 10. The quartz oscillator after oscillation frequency adjustment is returned to the normal temperature by cooling 22. Thus, the quartz oscillator of less frequency deviation is obtained.
|
