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The self-heating error of a resistance thermometer or thermistor arises because

  • A.the leads conduct heat away from the sensing element itself
  • B.the element takes time to reach the temperature of its surroundings
  • C.the resistance of the leads adds to that of the element
  • D.the measuring current dissipates power in the element

Answer: D

The element is a resistance carrying the measuring current, so it dissipates a little power and sits slightly above the temperature it is meant to report. The remedy is to keep the current small, which conflicts with wanting a usable signal.

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