| 摘要 |
PURPOSE:To always measure electrical characteristic of a solenoid by supplying a minute current not to actuate the solenoid from a low voltage power source and comparing a voltage impressed to the solenoid and a reference voltage settled previously in a comparator circuit. CONSTITUTION:The low voltage DC power source 1 supplying the minute current not to actuate the solenoid 6 is impressed to the solenoid 6 to compare the voltage impressed to the solenoid and the reference voltage settled previously in the comparator circuit 7, then the result is outputted to a CPU 8. A capacitor 10 is being charged with a high voltage DC power source 2 and is discharged in the manner of making a transistor to be ON by an output signal from the CPU 8. By this discharge current, the solenoid 6 can operate one time only but can not operate by only a current supplied from the power source 2. With such an arrangement, the electrical characteristic of solenoid 6 can be always measured. |
