Metrohm 757 VA Computrace - Manual (Page 89)

5.2 Working method specifications
757 VA Computrace – Software
79
rameters are not displayed if Batch with solution
exchange is selected for Technique .
No. [ 1...5 ; 0 ]
Number of addition solution to be used for man-
ual or automatic addition. For automatic addi-
tions, this number is also the Dosimat number. If
a mixed standard solution is used, the number of
this solution must be entered for each substance
present in the mixed solution.
Conc. [ > 0 ; 0 ]
Value for concentration of addition solution.
Unit [ µg/L...g/µL ; g/L ]
Unit for concentration of addition solution.
Volume (mL) [ > 0.01 mL / var ; 0 mL ]
Addition volume. For entering variable addition
volumes, click the button to open the
EDIT
VARIED ADDITION window for the selected sub-
stance (details see Variable addition). In this
case,
var is entered into the field instead of a
fixed value. This field only appears once for solu-
tions with the same number (mixed standards)
and it is not displayed if
Batch with solution ex-
change is selected for Technique or if 0 is entered
as solution number.
Click this button to open the CELL
CONCENTRATIONS window for entering the con-
centrations of the solutions used for standard
addition or the recording of calibration curves for
the selected substance (details see Concentra-
tions of calibration solutions). This button is only
displayed if
Batch with solution exchange is se-
lected for Technique .
Regression technique [ see below ; Linear Regression ]
Selection of regression technique:
Linear Regression
The regression is calculated with a straight line.
Nonlinear Regression
The regression is calculated with a nonlinear cur-
ve. This option is only available if
Record calibrati-
on curve is selected for Calibration .
Linear Regression (through Zero)
The regression is calculated with a straight line
forced to the zero point. This option is only avai-
lable if
Record calibration curve is selected for Ca-
libration .