Metrohm 797 VA Computrace - Manual (Page 185)

6.2 Calibration techniques with CVS and CPVS
797 VA Computrace – Software
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a fixed value. This field only appears once for solu-
tions with the same number (mixed standards)
and it is not displayed if
0 is entered as solution
number.
Regression technique
Selection of regression technique:
Linear Regression
The regression is calculated with a straight line.
Nonlinear Regression
The regression is calculated with a nonlinear
curve.
Linear Interpolation
The regression is calculated with a linear interpola-
tion through 2 points.
Quadratic Regression
The regression is calculated with a nonlinear
curve.
Peak evaluation [ Coulometric ] [ read only ]
Selection of peak evaluation quantity:
Coulometric
Charge transmitted during the peak.
Smooth factor [ 1...6 ; 4 ]
Smoothing power of the Savitzky/Golay smooth-
ing of the baseline (1 = minimum smoothing, 6 =
maximum smoothing) (s
ee Smoothing and differ-
entiation , section 5.8 ).
Eliminate spikes
Eliminates spikes to smooth the signal.
Reverse sweep [ on, off ; off ]
Enable peak evaluation of the reverse sweep of
cyclic sweeps (not available with CPVS).
Endpoint and evaluation criteria:
Addition ratio Q/Q(0) [ 0…1 ; 0.3]
The „Addition ratio“ defines the endpoint criteri-
on. After reaching this point, the standard additi-
ons are stopped and the “Calibration factor” is
calculated.
Evaluation ratio Q/Q(0) [ read only ]5]
The „Evaluation ratio“ defines the point of evalu-
ation for the calculation of the “Calibration factor”
Z.
Begin of evaluation Q/Q(0) [ 0…1 ; 1.0]
Only the measuring points between the „Begin of
evaluation“ and the „Evaluation ratio“ are used for
the calculation of the regression (linear, nonlinear
and quadratic).