| 摘要 |
PROBLEM TO BE SOLVED: To achieve a long-lived inexpensive electronic clinical thermometer for improving the measurement accuracy. SOLUTION: The electronic clinical thermometer includes: a thermistor; a reference resistor; a voltage switching section for switching and applying voltages so as to accumulate a charge in a capacitor through the thermistor or the reference resistor; an A/D conversion section 210 for detecting a voltage change due to a discharge of the charge accumulated in the capacitor through the thermistor or the reference resistor to output an ON signal while the capacitor has a predetermined voltage or more; a timer 222 for measuring a discharge time by measuring a duration of the ON signal; and a calculation processing section 223 for calculating a temperature around the thermistor by using the discharge time when the charge accumulated in the capacitor is discharged through the thermistor and an average of the discharge times when the charge accumulated in the capacitor is discharged through the reference resistor before and after the discharge. COPYRIGHT: (C)2010,JPO&INPIT
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