Abstract
The issues of the use of linear measuring devices for measuring temperature are considered. A method for measuring temperature by resistive temperature sensors based on a modification of the zero method is described. This modification ensures the invariance of the meter to changes in the gain of the measuring path. Zero balance in the measuring path is automatically supported by the synchronous execution of pulse-amplitude and pulse-width modulation and using a tracking circuit for adjusting the width of the latitudinal signal. When reaching zero balance, the pulse width of the latitude modulation control is connected linearly with the resistance of the temperature sensor. The errors of temperature measurements by the modified zero method are considered. The calibration of the manufactured digital thermometer with a miniature resistive temperature sensor made of platinum is described. The proposed modification of the zero measurement method can be used to create devices containing a sensor with a sensitive element – electrical resistance, changing under the influence of a non-electric quantity.
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