Discussion
Match each instrument performance characteristic with its check.
List I
A. Photometric scale
B. Wavelength scale
C. Zero and stray light
D. Repeatability
List II
1. a black trap at the measuring port
2. grey tiles of certified reflectance
3. repeated readings on a stable tile
4. a filter with sharp absorption bands
Answer: D
Correct answer: A-2, B-4, C-1, D-3
Each characteristic has its own check. The photometric scale is verified with grey tiles of certified reflectance, spanning the range rather than only the white end. The wavelength scale is checked with a filter having sharp absorption bands at known positions. Zero and stray light are checked with a black trap. And repeatability is measured by repeated readings on one stable tile.
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