Hach-Lange DR 3900 User Manual - Manual (Page 47)

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Standard programs
3. Press Filter: On/Off.
4. Activate On.
5. Select a required parameter.
6. Press OK to confirm the selection.
The chosen items are listed.
7. Press Options>Control Chart.
8. Press Standard Control Chart to choose the control chart
of the selected standard.
The measured standard concentrations are displayed
graphically with the control limits and date.