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"Since the EMF generated by thermocouple circuits is a function of the difference in temperatures between the measuring junction and the reference junction, it is important that the reference junction be maintained at a constant, known temperature. This can be accomplished by (1) a temperature controlled oven, (2) an ice bath, or (3) an electrical means of simulating a known temperature."

Reference Quote from National Plastic Heater (http://www.nphheaters.com/technical/thermo_letter.htm)

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