| 摘要 |
PURPOSE:To enable to use an indicating lamp as well as an ammeter or a voltmeter, by applying a heat sensitive thyristor to which a voltage having a rise below the increasing rate of critical voltage between the anode and the cathode is given. CONSTITUTION:A gate resistance 5 is set to a prescribed value and the temperature of a heat-sensitive thyristor 1 is made equal to the temperature of the substance, by causing the heat-sensitive thyristor 1 to contact to the substance. When a voltage of right-angled triangle shape is fed between the anode and the cathode of the thyristor 1 through a load resistance 3 from a power supply 2, the thyristor 1 turns on with a switching voltage corresponding to the temperature to produce a trapezoidal voltage across the load resistance 3. The average value of this trapezoidal voltage is indicated on a DC voltmeter 4. By reading the indication of the DC voltmeter 4, the temperature of the heat-sensitive thyristor 1, that is, that of the substance can be measured. |
