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The output of a thermocouple is of the order of

  • A.tens of microvolts per degree
  • B.tens of millivolts per degree
  • C.a volt per degree over the useful part of its range
  • D.a few microvolts per degree

Answer: A

Around forty microvolts per degree is typical of a base metal pair, so a hundred degrees gives four millivolts. That is small enough to demand a low-drift amplifier and careful attention to hum and thermal offsets in the leads.

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