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Thermocouples are complex and have many sources of error. This is mostly due to their operation. Thermocouples use two dissimilar metals that have two different voltage readings produced from a change in temperatures on alternative ends of the metals. They also have a cold junction, which consists of copper wires to allow the metal to meet the instrumentation. They use various types of electronic compensation at the cold junction to allow for more accurate readings; this accounts for marginal errors, depending upon the type of thermocouple used.
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