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Platinum RTD Signal Conditioner with Curvature Correction

Platinum RTD Signal Conditioner with Curvature Correction

The value of the resistance of the RTD sensor is converted to a voltage by running a constant current, 50uA, through it. As the sensor heats the resistance increases and unbalances the bridges of 1K resistors. The amplifier restores balance by sourcing more current into the lower fixed 1K resistor thus producing an increasing output voltage.