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An instrument's accuracy specified as a percentage of full scale means the error at a tenth of full scale is

  • A.a tenth as large as a percentage of the reading
  • B.zero
  • C.ten times larger as a percentage of the reading
  • D.the same percentage of the reading

Answer: C

One per cent of full scale on a reading of a tenth of full scale is ten per cent of that reading, which is why the range must be chosen so the reading sits high in it. A specification as a percentage of reading behaves quite differently.

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