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What does the wavelength accuracy of an instrument describe?

  • A.How far into the ultraviolet it can measure
  • B.How closely the indicated wavelength matches the true one
  • C.How narrow a band the monochromator passes
  • D.How closely two successive scans agree

Answer: B

Accuracy is the agreement between the wavelength displayed and the wavelength actually delivered, checked against a holmium filter or a mercury line. Bandwidth is resolution, agreement between scans is repeatability, and the ultraviolet limit is the spectral range. Four specifications describing four different things, and quoting one where another is meant makes an instrument comparison meaningless.

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