| 摘要 |
PURPOSE:To realize automatic adjustment of high accuracy without being affected by the characteristics of variable parts by detecting the difference between an output of circuit to be tested and a reference voltage using comparison circuit and directly controlling servo-motor thereby. CONSTITUTION:A circuit 1 to be tested amplifies signals on a signal line 12, and its output is inputted to a comparison circuit 3 through a DC/AC conversion circuit 2. The circuit 3 detects non-graduatedly the difference between the input and reference voltage which is delivered from a reference voltage generation circuit 4, and the result is output to a servo-motor control circuit 6 through a amplification circuit 5. At this moment, if a start signal is supplied from a control device 8 through a control signal circuit 21 to a control circuit 6, a servo-motor 7 starts rotating and rotates a variable resister 11 through a rotating axis 10. By this prodedure, the difference of voltage is reduced, and the motor 7 stops when the difference becomes '0' volt. Thus even when the used part is different, rotating direction of the motor 7 is controllable since the circuit 4 supplies a signal suitable to the part used, and the adjustment is automatically done with high precision. |
