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An intrusive measurement is avoided in an audit where possible because it

  • A.requires the process to be interrupted
  • B.is inherently less accurate than a non-intrusive one
  • C.cannot be logged over a long period
  • D.needs a higher safety category of instrument

Answer: A

A plant manager will rarely stop production to let a meter be fitted, so the audit must work with clamp-on and non-contact instruments. Intrusive methods are often the more accurate, which is the compromise being accepted.

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