Hach-Lange DR 5000 User Manual - Manual (Page 116)

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Advanced Operations
7. The result is displayed and is to be compared with the
nominal/standard data of the test filter.
8. Press Cancel to return to Optical Checks.
6.8.3.5 Drift check
The Drift Check test is used to test the stability of the instrument.
Note: The Drift Check runs 1 hour.
1. Press Drift Check in the Optical Checks menu.
2. Press λ to input the wavelength.
3. Input the wavelength and press OK to confirm.
4. Press Start.