G - Physics – 01 – K
Patent
G - Physics
01
K
73/123, 73/164,
G01K 7/00 (2006.01) G01K 1/02 (2006.01) G01K 3/10 (2006.01) G01K 7/10 (2006.01)
Patent
CA 1053030
SELF CONTAINED ELECTRONIC DIGITAL THERMOMETER ABSTRACT OF THE DISCLOSURE A self-contained electronic digital thermometer is in the form of an elongated probe has a temperature transducing thermistor at a front end and an electronic digital display at a rear end. Circuitry housed within the probe converts the voltage across the thermistor to a digital signal for driving the display. The circuitry includes an operational amplifier fed by the termistor voltage via a pair of selectable input resistors for providing different gains for the amplifier and fed by a voltage source via a different pair of selectable input resistors for providing different biases to the amplifier. The different gains and biases are selected by a switch for enabling readout in either degree Fahrenheit or degrees Centigrade. A differentiator and comparators are also provided to drive a series of lights indicative of whether the temperature is increasing, decreasing or stable.
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