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calibration of K TYPE thermocouple

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raafia

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I am using K type thermocouple with ad595.The resisistance between the two terminals of thermocouple is 8k. After ad 595 i am getting .25volts for room temperature and .39 volts for human body .The ponit is it is not giving me the stable value, a lotos variations .Can anybody please provide me with the schematic please .AD595 is fine as i have tested it as a stand alone thermometer as mentioned in data sheet.
 

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