BUCHI NIRCal - Manual (Page 103)

Chemometrics
NIRCal 5.5 Manual, Version A 103
Formula:
Use
Can increase the baseline shift, can be used for particle size separation.
Type:
The Calibration wavelengths are used when the pretreatment is added; the wavelength range can be
changed afterwards in the pretreatment that can be different from the calibration wavelength.
Add constant
When selecting this pretreatment the constant to be added has to be entered first.
e.g. Constant = 0.3
This pretreatment can be used for the correction of systematic errors.
NOTE
To subtract a constant simply enter a negative constant.