Hach-Lange DR2800 eco - Manual (Page 73)

73
Advanced Operations
9. Press Force 0 to change the setting from Off to On. The curve
then passes through the origin of the coordinate system.
Note: This may have an adverse effect on the correlation coefficient
(r
2 ).
10. Press Table to display the table again.
11. When the table has been completed and the curve type has
been chosen, press Done when the graph is displayed or Exit
when the table is displayed. Go to
section 6.1.1.4 on page 74 .
Calibration by entering the formula
1. Press Enter Formula and press Next.
2. Press the formula key.
A list of available formulas (linear and 2nd and 3rd order
polynomial) is displayed. Up to 4 coefficients can be entered,
depending on the selected formula. Press the required formula.
3. Depending on the selected formula, the required coefficients (a,
b, c...) are displayed. Press the coefficient keys and enter the
corresponding values via the alphanumeric keypad. After each
entry, press OK to confirm.
Note: The coefficients can have 5 digits and can have a positive or a
negative sign.