spectral bandwidth error in spectrochemical analysis

To measure the true shape, particularly the true maximum of an absorption band, the spectral bandwidth $Δ λ$ of the instrument must be much less than the width of the absorption band. A spectral bandwidth error results from using too large a bandwidth relative to the absorption band being measured.

Source:

PAC, 1988, 60, 1449 (Nomenclature, symbols, units and their usage in spectrochemical analysis - VII. Molecular absorption spectroscopy, ultraviolet and visible (UV/VIS) (Recommendations 1988)) on page 1456