Xylem photoLab 6100 VIS User Manual

Page 59

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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

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