Beckman Coulter UniCel DxC 600 Instructions For Use Manual page 88

System Description
Cartridge Chemistry: Calibration Theory
Table 1.18 Math Models for Non-Linear Chemistries (Continued)
Type
Model #9
Polynomial
Exponential
(PXP)
Quadratic
(POLY2)
Lorentz
Double Inflection
Model DP4
1-52
Math Model #9 is an extension to model #1, the four-parameter log-logit function.
The "c" is allowed to be either +1 or -1.
If c = +1, then this is equivalent to model #1.
If c = -1, an alternative function is being used.
This function cannot be solved directly for concentration. The instrument uses an
iterative method to determine the sample value.
K K
c1
R = +
a
1
1 + 1 +
conc conc
Formula
E014476L.EPS
E014477L.EPS
E014478L.EPS
c2
a
2
E011537L.EPS
A13914AF