wtw PhotoLab Spektral, Operating Instructions Manual

Page: 122 / 162

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13 User-defined methods
→
To measure the absorbance, insert a cell (without
barcode) with standard solution
or
→
Input the absorbance via the numeric keypad.
The absorbance value of the first standard solution
appears on the display.
→
Remove the cell
→
Use to continue with the input of the concen-
tration of the second solution.
Continue until the values of all standard solutions
(minimum 3, maximum 10) have been input or mea-
sured.
+ values: After pressing you can input additional
pairs of values.
The cursor is positioned on the selected pair of val-
ues.
→
Scroll in the table using
Erase: If the input or measurement is incorrect or in
case of “outliers”, a pair of values can be erased by
pressing twice. It is then possible to measure
once again.
On leaving the table, the photometer calculates the
slope S, zero point A0 and correlation coefficient r2
from the data of the available value pairs.
The following options are available for leaving the ta-
ble:
●
print: Pressing prints value pairs, zero point,
slope and correlation coefficient of the new
method
●
return: Pressing terminates the input. Please
note that the graphical and tabular display is no
longer available. The display shows the data of
the new method; it can be stored.
●
graphic: Pressing swaps between the graph-
ical and tabular display of the characteristics.