| 摘要 |
PURPOSE:To automatically and completely electronically control the oscillation frequency of an oscillator. CONSTITUTION:An output from an oscillator OSC consisting of an oscillation element 1, an inversional amplifier 2, etc., is supplied to a frequency measuring instrument 6 and its oscillation frequency is detected. A personal computer 7 judges whether the detected oscillation frequency is included within a previously set prescribed range or not. A microprocessor 4 for outputting control voltage Vc from a D/A converter 5 increases/decreases the voltage Vc in accordance with the judged result of the computer 7. The voltage Vc is impressed to a variable capacity capacitor 3. The capacity of the capacitor 3 is changed in accordance with the level of the voltage Vc, so that the oscillation frequency of the oscillator OSC is changed. If the oscillation frequency of the OSC is deviated from the prescribed range, the microprocessor 4 controls the voltage Vc so as to include the oscillation frequency in the prescribed range. |
