Hach-Lange DR 3900 User Manual - Manual (Page 120)

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Expanded programs
3. Enter the required interval, and the system will automatically
issue a prompt to add an analysis. Press OK to confirm the
entry.
4. Define the required unit for the interval. Press OK to confirm
the entry.
6.8.4.3 Multiple Determination
1. Press Multiple Determination.
2. Press Reminder<Off>.
3. Press On.
4. Select the required interval. Press OK to confirm the entry.
5. Select a unit for the interval. Press OK to confirm the entry.
6. Enter the number of measurements for multiple definitions.
Press OK to confirm.
7. Enter the tolerance as a percentage. Press OK to confirm.
8. Press OK to confirm all the entries.