| 摘要 |
PURPOSE:To accurately adjust parameters with a simple constitution by installing a rotating direction switching circuit which compares the output parameter of a unit to be adjusted with a prescribed atandard parameter and outputs a signal which brings the output parameter close to the standard value. CONSTITUTION:A unit to be adjusted 1 has a trimmer condenser CC and the adjustment is performed by controlling the rotational operation with a pulse motor Mp. When an oscillated output of the unit 1 is inputted into a comparator 2, the comparator 2 measures the output for a fixed time and outputs a code signal through a terminal 2a and a rotary pulse through another terminal 2b. Moreover, the comparator compares the inputted frequency with a normal-frequency stored in the comparator 2 through a terminal 2c, and outputs a binary signal ''1'' when the inputted value > the normal value, and ''0'' when the inputted value < the normal value, to a reversing direction switching circuit 3. The circuit 3 compares the level of frequencies before and after the adjustment, and then, compares the result of the comparison with the rotating direction indicate signal from the signal 2b. Then, the circuit 3 outputs a signal which brings the frequency close to the standard value to a driving mechanism DS corresponding to the changing direction of the frequency of the previous stage stored, and adjusts the condenser CC by driving the motor Mp. |
