| 摘要 |
PURPOSE:To obtain an accurate measured result and to make high-speed and efficient measurement possible by applying directly the voltage between both ends of a selected resistance bulb to a capacitor to charge it quickly, and applying it through a resistor just before disconnecting from the capacitor. CONSTITUTION:FET switches S1-S3 for selection are turned on successively for a certain time to select voltages between both ends of resistance bulbs RTD1-RTD3, and they are inputted to a sample and hold circuit 2; and when this input is started, an FET switch S4 is turned on to apply directly voltages to a capacitor C1, and the capacitor C1 is charged at a high speed. When this charge is completed, the switch S4 is turned off, and a resistor R1 and the capacitor C1 operate as an HPF to eliminate the generated noise, and the charging voltage of the capacitor C1 is held in a certain level without the variance due to noise. Thus, one measurement is performed in a short time to measure many temperatures efficiently at a high speed. |
