| 摘要 |
PURPOSE:To enable to obtain a stable set value by applying the set value for the frequency of a generator by the output of a counter. CONSTITUTION:An arithmetic circuit 16 calculates the set value necessary at that time from the given data, and an output circuit 17 outputs a control signal 17b indicating the direction of the rising or falling frequency and a pulse 17a of a pulse train signal of the number corresponding to the rising or failling amount on the basis of the calculated result. A counter 19 up or down counts the pulse 17a from the output circuit 17, and inputs the counted result through a digital- to-analog converter 20 as a frequency set value to an operational amplifier 10. The amplifier 10 controls the frequency of the generator 1 so that the deviation between the value of the frequency signal and the set value of the generator 1 becomes minimum. |
