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A design must measure a 4 to 20 mA loop current to one per cent. The converter resolution needed is at least

  • A.16 bits
  • B.24 bits
  • C.8 bits
  • D.12 bits

Answer: C

One per cent of the sixteen milliampere span is 160 microamperes, one part in a hundred, and eight bits gives one part in 256. In practice ten or twelve bits would be specified so that noise and non-linearity leave the one per cent intact.

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