| 摘要 |
<p>The present invention relates to a multiple input circuit comprising: a first terminal receiving a signal from an RTD temperature sensor and a signal from a current means; a second terminal receiving a signal from the RTD temperature sensor and a signal from a voltage means; a third terminal receiving a signal from the RTD temperature sensor, a signal from the current means, and a signal from the voltage means, and being grounded; at least one diode connected in series between the first terminal and the third terminal; a sensing resistor connected in series to the diode between the first terminal and the third terminal; a multiplexer connected to input ends of each of the first terminal, the second terminal, the third terminal, and the sensing resistor; a power supply connected to the first terminal, and applying power to the RTD temperature sensor according to whether a switch is on or off; and a controller for controlling the multiplexer and the switch, wherein a control measuring instrument such as a temperature controller or a panel meter receives a temperature sensor signal, an analog voltage signal, and an analog current signal through the same input terminal, and determines the type of signal through a diode in order to reduce manufacturing costs and enable product miniaturization.</p> |
