wtw PhotoLab Spektral Operating Instructions Manual page 121

Selecting input zero point and slope:
Selecting calculate zero point and slope:
When entering user-defined methods, the photometer
offers the option to measure/input and store the char-
acteristics in a single step. In doing so, minimum 3 up
to maximum 10 standard solutions are measured;
from these, the photometer determines the slope and
zero point of the new method.
13 User-defined methods
At this point, the photometer provides practical default
values for the AQA theoretical value and tolerance.
They can be overwritten using the numeric keypad.
→ Confirm each time using
→ Use
to select between
input zero point and slope
calculate zero point and slope.
→ Confirm with
.
→ Input the zero point and slope
→ Select the sign (+/–) using
– Numbers from 0 to 9
– Confirm each time using
→ Press
and input the concentration of the first
standard solution, e. g. 100 mg/l.
.
.
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