Hach-Lange DR 3900 User Manual - Manual (Page 87)

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Expanded programs
6.1.2.3 Enter the calibration formula (evaluation formula)
The calibration formula (evaluation formula) defines the
calculation and display of intermediate and final results. The
previously defined elements of the measuring sequence are the
basis for calculating the concentrations.
Enter calibration formula C1
1. Mark the Formula row in the data overview.
2. Press Edit.
3. Mark the C1 row: Off.
4. Press Edit.
5. Mark C1: Out.
6. Press Edit.
The display changes to C1: On.
7. Mark the next row C1=, to define the formula.
8. Press Edit..
Refer to Table 11 for detailed information on the Edit formula
keys.
Note: The evaluation formula is built up successively in the display in
accordance with the input.
Note: The arrow key deletes the most recently entered element of the
formula.