G - Physics – 01 – K
Patent
G - Physics
01
K
73/63, 73/0.5
G01K 15/00 (2006.01) G01K 7/14 (2006.01)
Patent
CA 1122027
DIGITAL THERMOMETER MODIFICATION FOR TELEMETRY AND ANALOG RECORDING Abstract of the Disclosure Add-on circuitry is disclosed for use with an electronic digital thermometer to provide a variable range analog output for applications such as telemetry and analog recording. An analog output circuit has offset and gain adjustments 50 that its output range can be adjusted to correspond to the desired range of temperatures to be measured without affecting the basic accuracy of the thermometer indicator readout. A circuit is connected to the thermometer input for adjustably simulating, in turn, a low and a high temperature reading corresponding to the limits of the expected temperature range to be measured. As the low temperature is simulated and read from the thermometer indicator, the offset is adjusted to provide the low level analog output. The high temperature is then simulated and the gain adjusted to yield the desired analog output, preferably near full scale. A relay circuit designed to have a low thermocouple effect is used to selectively couple the simulator circuit to the thermometer input without having to disconnect the thermocouple.
344989
Borden Ladner Gervais Llp
Deere & Company
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