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A data logger is preferred to a spot reading when the quantity

  • A.must be measured to the highest accuracy
  • B.is required in units the meter does not display
  • C.varies through the shift or the season
  • D.is difficult to reach with a hand instrument

Answer: C

A single reading of a fluctuating load is worth very little, and a week of logging reveals the night-time base load, the shift pattern and the peaks. Accuracy is a property of the instrument rather than of the logging.

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