Advanced operations – Hach-Lange DR 2800 eco User Manual
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Advanced Operations
4.
When the data have all been entered, you can display the
curve that results from plotting the entered data by pressing
Graph.
Note: The correlation coefficient (r
2
) is shown on the left below the
axes.
5.
The linear curve corresponds to the standard setting. If you
press Next Curve the polynomial 2nd order curve is displayed,
and if you press Next Curve again, the polynomial 3rd order
curve is displayed.
6.
Press Force 0 to change the setting from Off to On. The curve
now passes through the origin of the coordinate system.
Note: This may have an adverse effect on the correlation coefficient
(r
2
).
7.
Press Table to display the table again.
8.
When the table has been completed and the curve type has
been chosen, press Done.
Measuring the absorbance of the standard solution:
1.
Press Read Standards and press Next.
2.
To enter the standard concentrations in the displayed table,
press the "+" symbol. Use the alphanumeric keypad to enter
the standard concentration. Press OK.