| 摘要 |
PURPOSE:To recognize a sample readily, by cutting a current, which flows into the sample based on a driving signal in accordance with the comparison and judgment of signals from a conversion circuit and a reference-signal generating circuit, displaying the result, and issuing warning. CONSTITUTION:A current, which has passed through a sample 4, is converted into a voltage in a current detecting circuit 9. The voltage is inputted into a comparator circuit 10. A voltage, which is generated in a reference-voltage generating circuit 11, is also inputted into the comparator circuit 10. The comparator 10 compares the voltage from the current detecting circuit 9 and the voltage from the reference voltage generating circuit 11. When the voltage from the circuit 9 becomes larger than the voltage from the circuit 11, a driving signal is generated. The driving signal is amplified in a relay driving circuit 12. A high voltage current, which is supplied to the sample 4, is cut by a relay 7. Meanwhile, the driving signal is amplified in a light-emitting-diode driving circuit 14 in a display circuit 13, and a diode 15 emits light. A buzzer 18 is sounded by the signal through an OR circuit 16 and a bistable circuit 17 in a warning circuit 3. Thus the sample can be readily recognized. |
