| 摘要 |
Provided is a long-life inexpensive electronic clinical thermometer with high measurement accuracy. The electronic clinical thermometer includes a thermistor, a reference resistor, a voltage switch for selectively applying a voltage in order to accumulate electric charge in a capacitor via the thermistor or reference resistor, an A/D converter for detecting a voltage change occurring when removing the electric charge accumulated in the capacitor via the thermistor or reference resistor, and outputting an ON signal while the capacitor has a voltage equal to or higher than a predetermined voltage, a timer for measuring the discharge time by measuring the duration of the ON signal, and an arithmetic processor for calculating the ambient temperature of the thermistor by using the discharge time when removing the electric charge accumulated in the capacitor via the thermistor, and the average value of the discharge times when removing the electric charge accumulated in the capacitor via the reference resistor immediately before and after removing the electric charge accumulated in the capacitor via the thermistor.
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