Offset_linearization_for_type_S_thermocouple

Published:2009/7/24 2:30:00 Author:Jessie | From:SeekIC

Fig. 13-18 In this circuit, the LT1025 provides cold-junction compensation and the LTC chopper-stabilized amplifier is used for low drift. The type-S thermocouple output slope varies greatly with temperature (at 25℃, the output is 6℃, with an 11μV/℃ slope at 1000℃). This circuit linearizes the output and provides 3℃ accuracy over the indicated output range of 800 to 1200℃. To calibrate, trim R2for a Vout of 1.669 with a Vin, of 0.000 mV. Then, trim R2 for a Vout of 9.998 with a temperature of 1000℃ or for a Vin (+input) of 9.585 mV.



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