Machine-translated by Google. Questions are authored in English.
Top

Discussion

Photometric accuracy of an instrument refers to

  • A.the repeatability of successive readings taken
  • B.the speed at which measurements are completed
  • C.the correctness of the reflectance scale it reports
  • D.the correctness of the wavelength scale that it uses

Answer: C

Correct answer: the correctness of the reflectance scale it reports

Photometric accuracy concerns the vertical axis: whether a surface of 40 per cent reflectance is reported as 40 per cent. It is checked with grey tiles of certified reflectance spanning the range. Wavelength accuracy concerns the horizontal axis, and repeatability is a separate property again - an instrument can be repeatable and inaccurate at once.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.