Xylem photoLab 6100 VIS User Manual
Page 59
photoLab
®
6100 VIS
Operation
59
ba75847e01
08/2009
Line types
The dependency between the nominal value and absorbance is often linear
in a wide range as shown in the following example:
Bild 4-2
Example of a linear calibration function after a 10-point calibration
In the case of a linear dependency, the calibration function is determined by
means of linear regression. The slope and axis intercept (E0) are the
characteristics of the calibration line.
In the case of a nonlinear dependency, the points of the measuring ranges
can be connected to each other as a polygon line or approximated as a
parabola:
Bild 4-3
Example of a polygon line calibration function after a 10-point calibration
Bild 4-4
Example of a parabola calibration function after a 10-point calibration
0
0
Nominal value (e. g. concentration)
Absorbance
0
0
Nominal value (e. g. concentration)
Absorbance
0
0
Nominal value (e. g. concentration)
Absorbance